List of highest-income counties in the United States

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Per capita income by county

There are 3,144 counties and county-equivalents in the United States. The source of the data is the U.S. Census Bureau and the data is current as of the indicated year. Independent cities are considered county-equivalent by the Census Bureau.

Summary[edit]

Before the American Civil War, the wealthiest counties were primarily located in Louisiana and Mississippi, because of the high number of enslaved people, who were not included in the population.[1]

Loudoun County, Virginia, a suburb of Washington, D.C., is the highest-income county by median household income. Another Washington, D.C. suburb, Arlington County, Virginia, ranked as the highest-income county by median family income as of 2013.[2]


Median household income[edit]

2020 Census[edit]

The graph below depicts the 100 highest income counties in the United States by median household income according to the 2020 United States census.[3] Virginia has the most counties in the top 100 with 18. It is followed by California with 11, Maryland with 10, New Jersey with nine, New York and Texas with six each, Illinois with five, Colorado, Massachusetts, and Minnesota with four each, Ohio and Pennsylvania with three each, Georgia, Indiana, Utah, and Washington with two each, and Connecticut, Washington, D.C., Iowa, Kansas, Kentucky, New Hampshire, New Mexico, Tennessee, and Wisconsin with one each.

Rank County or
Equivalent 		State Median
Household
Income
1 Loudoun County Virginia Virginia $147,111
2 Falls Church Virginia Virginia $146,922
3 Santa Clara County California California $130,890
4 San Mateo County California California $128,091
5 Fairfax County Virginia Virginia $127,866
6 Howard County Maryland Maryland $124,042
7 Arlington County Virginia Virginia $122,604
8 Marin County California California $121,671
9 Douglas County Colorado Colorado $121,393
10 Nassau County New York (state) New York $120,036
11 Los Alamos County New Mexico New Mexico $119,266
12 San Francisco County California California $119,136
13 Hunterdon County New Jersey New Jersey $117,858
14 Morris County New Jersey New Jersey $117,298
15 Somerset County New Jersey New Jersey $116,510
16 Forsyth County Georgia (U.S. state) Georgia $112,834
17 Calvert County Maryland Maryland $112,696
18 Nantucket County Massachusetts Massachusetts $112,306
19 Stafford County Virginia Virginia $112,247
20 Montgomery County Maryland Maryland $111,812
21 Delaware County Ohio Ohio $111,411
22 Williamson County Tennessee Tennessee $111,196
23 Fairfax Virginia Virginia $109,708
24 Prince William County Virginia Virginia $107,707
25 Putnam County New York (state) New York $107,246
26 Summit County Utah Utah $106,973
27 Middlesex County Massachusetts Massachusetts $106,202
28 Rockwall County Texas Texas $105,956
29 Fauquier County Virginia Virginia $105,665
30 Suffolk County New York (state) New York $105,362
31 Norfolk County Massachusetts Massachusetts $105,320
32 Alameda County California California $104,888
33 Bergen County New Jersey New Jersey $104,623
34 Elbert County Colorado Colorado $104,231
35 Chester County Pennsylvania Pennsylvania $104,161
36 Carver County Minnesota Minnesota $104,011
37 Contra Costa County California California $103,997
38 Oldham County Kentucky Kentucky $103,761
39 Charles County Maryland Maryland $103,678
40 Monmouth County New Jersey New Jersey $103,523
41 Scott County Minnesota Minnesota $103,261
42 Anne Arundel County Maryland Maryland $103,225
43 Alexandria Virginia Virginia $102,227
44 Broomfield County Colorado Colorado $101,206
45 Poquoson Virginia Virginia $100,696
46 Frederick County Maryland Maryland $100,685
47 Collin County Texas Texas $100,541
48 Morgan County Utah Utah $100,408
49 Fort Bend County Texas Texas $100,189
50 Carroll County Maryland Maryland $99,569
51 Westchester County New York (state) New York $99,489
52 King County Washington (state) Washington $99,158
53 Hamilton County Indiana Indiana $98,880
54 Kendall County Texas Texas $98,692
55 New Kent County Virginia Virginia $97,688
56 Washington County Minnesota Minnesota $97,584
57 Fairfield County Connecticut Connecticut $97,539
58 Goochland County Virginia Virginia $97,146
59 Kendall County Illinois Illinois $96,854
60 King George County Virginia Virginia $96,711
61 Queen Anne's County Maryland Maryland $96,467
62 Sussex County New Jersey New Jersey $96,222
63 St. Mary's County Maryland Maryland $95,864
64 DuPage County Illinois Illinois $94,930
65 Rockland County New York (state) New York $94,840
66 Orange County California California $94,441
67 Harford County Maryland Maryland $94,003
68 Rockingham County New Hampshire New Hampshire $93,962
69 Powhatan County Virginia Virginia $93,833
70 Fayette County Georgia (U.S. state) Georgia $93,777
71 Placer County California California $93,677
72 Montgomery County Pennsylvania Pennsylvania $93,518
73 York County Virginia Virginia $93,356
74 Bucks County Pennsylvania Pennsylvania $93,181
75 Plymouth County Massachusetts Massachusetts $92,906
76 Lake County Illinois Illinois $92,654
77 Napa County California California $92,219
78 Middlesex County New Jersey New Jersey $91,731
79 James City County Virginia Virginia $91,675
80 Johnson County Kansas Kansas $91,650
81 Hanover County Virginia Virginia $91,444
82 Spotsylvania County Virginia Virginia $90,913
83 Washington Washington, D.C. District of Columbia $90,842
84 Williamson County Texas Texas $90,834
85 Will County Illinois Illinois $90,800
86 Gilpin County Colorado Colorado $90,547
87 Denton County Texas Texas $90,354
88 Burlington County New Jersey New Jersey $90,329
89 McHenry County Illinois Illinois $90,014
90 Santa Cruz County California California $89,986
91 New York County New York (state) New York $89,812
92 Boone County Indiana Indiana $89,444
93 Warren County Ohio Ohio $89,410
94 Ventura County California California $89,295
95 Snohomish County Washington (state) Washington $89,273
96 Gloucester County New Jersey New Jersey $89,056
97 Waukesha County Wisconsin Wisconsin $88,985
98 Union County Ohio Ohio $88,565
99 Dakota County Minnesota Minnesota $88,468
100 Dallas County Iowa Iowa $88,368

2010 Census[edit]

[4]

Rank County Median Household Income
1 Loudoun County, Virginia $115,574
2 Falls Church, Virginia $114,409
3 Fairfax County, Virginia $105,416
4 Los Alamos County, New Mexico $103,643
5 Howard County, Maryland $103,273
6 Hunterdon County, New Jersey $100,980
7 Oakland County, Michigan $99,198
8 City of Fairfax, Virginia $97,900
9 Somerset County, New Jersey $97,440
10 Morris County, New Jersey $96,747
11 Arlington County, Virginia $94,880
12 Nassau County, New York $93,613
13 Montgomery County, Maryland $93,373
14 Stafford County, Virginia $93,065
15 Prince William County, Virginia $91,098
16 Calvert County, Maryland $90,838
17 Marin County, California $89,268
18 Putnam County, New York $89,218
19 Charles County, Maryland $88,825
20 Spotsylvania County, Virginia $88,628
20 Delaware County, Ohio $87,908
21 Williamson County, Tennessee $87,832
23 Forsyth County, Georgia $87,605
23 Santa Clara County, California $86,850
24 San Mateo County, California $85,648
25 Chester County, Pennsylvania $84,741
26 Suffolk County, New York $84,506
27 City of Poquoson, Virginia $84,315
28 Fauquier County, Virginia $83,877
29 Anne Arundel County, Maryland $83,456
30 Sussex County, New Jersey $83,089
31 Rockland County, New York $82,534
32 Monmouth County, New Jersey $82,265
33 Fayette County, Georgia $82,216
34 Scott County, Minnesota $82,190
35 Hamilton County, Indiana $81,947
36 Bergen County, New Jersey $81,708
37 Frederick County, Maryland $81,686
38 Carroll County, Maryland $81,621
39 Fairfield County, Connecticut $81,268
40 Queen Anne's County, Maryland $81,096
41 York County, Virginia $81,055
42 Norfolk County, Massachusetts $81,027
43 City of Alexandria, Virginia $80,847
44 Collin County, Texas $80,504
45 Carver County, Minnesota $80,280
46 St. Mary's County, Maryland $80,053
47 Kendall County, Illinois $79,897
48 Fort Bend County, Texas $79,845
49 Westchester County, New York $79,619
50 Goochland County, Virginia $79,547
51 Summit County, Utah $79,461
52 Oldham County, Kentucky $79,417
53 Washington County, Minnesota $79,109
54 Elbert County, Colorado $78,958
55 Lake County, Illinois $78,948
56 Contra Costa County, California $78,385
57 Rockwall County, Texas $78,032
58 Middlesex County, New Jersey $77,615
59 Middlesex County, Massachusetts $77,377
60 Tolland County, Connecticut $77,175
61 Harford County, Maryland $77,010
62 DuPage County, Illinois $76,581
64 McHenry County, Illinois $76,482
65 Hanover County, Virginia $76,425
66 Montgomery County, Pennsylvania $76,380
67 Burlington County, New Jersey $76,258
68 King George County, Virginia $76,241
69 Will County, Illinois $75,906
70 Rockingham County, New Hampshire $75,825
71 City and County of Broomfield, Colorado $75,590
72 Ventura County, California $75,348
73 City of Manassas, Virginia $75,173
74 Waukesha County, Wisconsin $75,064
75 Ozaukee County, Wisconsin $74,996
76 Middlesex County, Connecticut $74,906
77 Bucks County, Pennsylvania $74,828
78 Placer County, California $74,447
79 Orange County, California $74,344
80 James City County, Virginia $73,903
81 Johnson County, Kansas $73,733
82 Powhatan County, Virginia $73,593
83 Clarke County, Virginia $73,244
84 Plymouth County, Massachusetts $73,131
85 Dakota County, Minnesota $72,850
86 Gloucester County, New Jersey $72,664
87 Aleutians West Census Area, Alaska $72,219
88 Livingston County, Michigan $72,129
89 Eagle County, Colorado $71,337
90 Chesterfield County, Virginia $71,321
91 Warren County, Ohio $71,274
92 Prince George's County, Maryland $71,260
93 Mercer County, New Jersey $71,217
94 Richmond County, New York $71,084
95 Denton County, Texas $70,622
96 New Kent County, Virginia $70,590
97 St. Charles County, Missouri $70,331
98 Honolulu County, Hawaii $70,093
99 El Dorado County, California $70,000
100 Alameda County, California $69,384
2009

The rankings are based on the median annual household income estimates from 2005 to 2009 in each county in the nation, provided by the United States Census Bureau's American Community Survey, in 2009 inflation-adjusted dollars.[5] Since cities in Virginia are independent of surrounding counties they are included in the Census Bureau's ranking.

Number of counties by state in following list: Virginia 5 plus 3 independent cities, Maryland 4, New Jersey 3, New York 3, California 2, Colorado 1, Georgia 1, New Mexico 1, Ohio 1, Tennessee 1. Of the top 25 counties, 10 are part of the Baltimore-Washington Metropolitan Area, 6 counties are part of the New York Metropolitan Area, and 2 counties are part of the San Francisco Bay Area. By Census region, 14 counties are located in the South, 6 in the Northeast, 4 in the West, and 1 located in the Midwest. 17 of the 25 counties are part of the densely populated Northeast Megalopolis.

2008

[6] This data is average 2006–2008 from the American Community Survey of the United States Bureau of the Census. Number of counties by state in following lists: Virginia 6 plus 2 independent cities, Maryland 4, New Jersey 3, New York 3, California 2, Colorado 1, Georgia 1, Pennsylvania 1, Tennessee 1, Utah 1.

Of the top 25 counties, 11 are part of the Washington Metropolitan Area, 6 counties are part of the New York Metropolitan Area, and 2 counties are part of the San Francisco Bay Area. By Census region, 14 counties are located in the South, 7 in the Northeast, 4 in the West, with none located in the Midwest. 18 of the 25 counties are part of the densely populated Northeast Megalopolis. Educational attainment is based on bachelor's degree attainment (and above) for people 25 and older in the county.

2007

[7]

Number of counties by state in following lists: Virginia 6, Maryland 5, New Jersey 3, New York 2, California 2, Colorado 1, Georgia 1.

10 of the 20 counties are part of the Washington Metropolitan Area and 5 counties are part of the New York Metropolitan Area. By Census region, 12 counties are located in the South, 5 in the Northeast, and 3 in the West. 16 of the 20 counties are part of the densely populated Northeast Megalopolis.

2006

[8]

Source: US Census Bureau, 2006 American Community Survey, via Forbes

Number of counties by state in the top 20: Virginia 5 plus 1 independent city, California 3, Maryland 3, New Jersey 3, New York 2, Colorado 1, Georgia 1, Tennessee 1. Forty-two states do not have any counties in the top 20.

2000 Census[edit]

[9]

Number of counties by state in the top 100
100 highest counties by median household income

Source: US Census Bureau: 2000 Census

Number of counties by state in the top 100: Virginia 10 plus 5 independent cities, Maryland 9, California 8, New Jersey 8, Georgia 7, Colorado 6, Illinois 6, Minnesota 5, New York 5, Texas 5, Alaska 3, Connecticut 3, Ohio 3, Pennsylvania 3, Wisconsin 2, Massachusetts 2, Michigan 2, Indiana 1, Kansas 1, Kentucky 1, Missouri 1, New Hampshire 1, New Mexico 1, Tennessee 1, Utah 1. Twenty-five states do not have any counties in the top 100.

United States of America: $41,994

Rank County Median
Household
Income
1 Douglas County, Colorado $82,929
2 Fairfax County, Virginia $81,050
3 Loudoun County, Virginia $80,648
4 Hunterdon County, New Jersey $79,888
5 Los Alamos County, New Mexico $78,993
6 Morris County, New Jersey $77,340
7 Somerset County, New Jersey $76,933
8 City of Falls Church, Virginia $74,924
9 Santa Clara County, California $74,335
10 Howard County, Maryland $74,167
11 Suffolk County, New York $73,979
12 Nassau County, New York $72,030
13 Montgomery County, Maryland $71,551
14 Marin County, California $71,306
15 Fayette County, Georgia $71,227
16 Hamilton County, Indiana $71,026
17 Collin County, Texas $70,835
18 San Mateo County, California $70,819
19 Johnson County, Kansas $69,817
20 Williamson County, Tennessee $69,104
21 Forsyth County, Georgia $68,890
22 Rockland County, New York $67,971
23 DuPage County, Illinois $67,887
24 City of Fairfax, Virginia $67,642
25 Livingston County, Michigan $67,400
26 Delaware County, Ohio $67,258
27 Lake County, Illinois $66,973
28 Stafford County, Virginia $66,809
29 Scott County, Minnesota $66,612
30 Washington County, Minnesota $66,305
31 Prince William County, Virginia $65,960
32 Calvert County, Maryland $65,945
33 Carver County, Minnesota $65,540
34 Columbia County, Georgia $65,507
35 Chester County, Pennsylvania $65,295
36 Putnam County, New York $65,288
37 Sussex County, New Jersey $65,266
38 Fairfield County, Connecticut $65,249
39 Bergen County, New Jersey $65,241
40 Rockwall County, Texas $65,164
41 Summit County, Utah $64,962
42 McHenry County, Illinois $64,826
43 Kendall County, Illinois $64,625
44 Monmouth County, New Jersey $64,231
45 City and County of Broomfield, Colorado $63,903
46 Fort Bend County, Texas $63,831
47 Contra Costa County, California $63,675
48 Westchester County, New York $63,582
49 Norfolk County, Massachusetts $63,432
50 Oldham County, Kentucky $63,229
51 North Slope Borough, Alaska $63,173
52 Arlington County, Virginia $63,001
53 Waukesha County, Wisconsin $62,839
54 Ozaukee County, Wisconsin $62,745
55 Eagle County, Colorado $62,682
56 Elbert County, Colorado $62,480
57 Will County, Illinois $62,238
58 Charles County, Maryland $62,199
59 City and Borough of Juneau, Alaska $62,034
60 Fauquier County, Virginia $61,999
61 Oakland County, Michigan $61,907
62 Orange County, California $61,899
63 Dakota County, Minnesota $61,863
64 Anne Arundel County, Maryland $61,768
65 Middlesex County, New Jersey $61,446
66 Aleutians West Census Area, Alaska $61,406
67 City of Poquoson, Virginia $60,920
68 Cherokee County, Georgia $60,896
69 Montgomery County, Pennsylvania $60,829
70 Middlesex County, Massachusetts $60,821
71 City of Manassas Park, Virginia $60,794
72 Williamson County, Texas $60,642
73 Gwinnett County, Georgia $60,537
74 City of Manassas, Virginia $60,409
75 Frederick County, Maryland $60,276
76 Geauga County, Ohio $60,200
77 Carroll County, Maryland $60,021
78 Bucks County, Pennsylvania $59,727
79 Ventura County, California $59,666
80 Pitkin County, Colorado $59,375
81 Kane County, Illinois $59,351
82 Hanover County, Virginia $59,223
83 Middlesex County, Connecticut $59,175
84 Tolland County, Connecticut $59,044
85 Burlington County, New Jersey $58,608
86 Chesterfield County, Virginia $58,537
87 Cobb County, Georgia $58,289
88 Denton County, Texas $58,216
89 Rockingham County, New Hampshire $58,150
90 York County, Virginia $57,956
91 Warren County, Ohio $57,952
92 Anoka County, Minnesota $57,754
93 Placer County, California $57,535
94 Spotsylvania County, Virginia $57,525
95 San Benito County, California $57,469
96 Jefferson County, Colorado $57,339
97 Henry County, Georgia $57,309
98 St. Charles County, Missouri $57,258
99 Harford County, Maryland $57,234
100 Queen Anne's County, Maryland $57,037

Per capita income[edit]

2010 Census[edit]

CA1-3 Personal income summary: Per capita personal income, 2010, BEA[10]
Rank County Per Capita
Personal Income
1 New York County, New York $111,386
2 Teton County, Wyoming $94,672
3 Marin County, California $89,936
4 Howard County, Maryland $80,165
5 Arlington County, Virginia $79,967
6 Alexandria, Virginia $76,362
7 Pitkin County, Colorado $76,318
8 Town and County of Nantucket, Massachusetts $73,654
9 Westchester County, New York $73,159
10 Fairfield County, Connecticut $71,768
11 District of Columbia $70,710
12 City and County of San Francisco, California $70,190
13 Somerset County, New Jersey $69,886
14 Morris County, New Jersey $69,811
15 Summit County, Utah $68,524
16 San Mateo County, California $67,964
17 Montgomery County, Maryland $67,639
18 Slope County, North Dakota $67,089
19 Hunterdon County, New Jersey $67,053
20 Fairfax County & Fairfax City & Falls Church, Virginia $66,679
21 Douglas County, Colorado $66,047
22 Nassau County, New York $65,615
23 Bergen County, New Jersey $65,486
24 Blaine County, Idaho $63,883
25 Howard County, Maryland $63,375
Average per capita income 2009

[11]

Number of counties by state in the top 20: New Jersey 4; California 3; New York 2; Virginia 1 county, 1 independent city, and 1 statistical unit comprising a county and two independent cities; Colorado, Connecticut, Florida, Idaho, Maryland, Texas, South Dakota, and Wyoming 1 each.

Of the 20 counties, 7 are part of the New York Metropolitan Area, 4 are part of the Washington Metropolitan Area, and 3 are part of the San Francisco Bay Area. By Census region, 7 counties are located in the Northeast, 6 in the South, and 6 in the West.

2000 Census[edit]

[9]

Number of counties ranked in the top 100 nationally, by state
100 highest ranked counties by per capita income

Number of counties by state in the top 100: Colorado 10, Virginia 7 counties plus 3 independent cities, New Jersey 9, California 8, Florida 6, New York 6, Georgia 4, Maryland 4, Minnesota 4, Connecticut 3, Massachusetts 3, Michigan 3, Pennsylvania 3, Texas 3, Illinois 2, North Carolina 2, Ohio 2, Washington 2, Wisconsin 2, Idaho 1, Alaska 1, Alabama 1, District of Columbia 1, Indiana 1, Kansas 1, Missouri 1, Nevada 1, New Hampshire 1, New Mexico 1, Rhode Island 1, Tennessee 1, Utah 1, Wyoming 1. Eighteen states do not have any counties in the top 100. United States of America per capita average: $21,587

Rank County Per Capita
Income
1 Marin County, California $44,962
2 New York County, New York (Manhattan) $42,922
3 City of Falls Church, Virginia $41,052
4 Pitkin County, Colorado $40,811
5 Fairfield County, Connecticut $38,350
6 Teton County, Wyoming $38,260
7 Somerset County, New Jersey $37,970
8 Arlington County, Virginia $37,706
9 City of Alexandria, Virginia[1] $37,645
10 Morris County, New Jersey $36,964
11 Fairfax County, Virginia $36,888
12 Westchester County, New York $36,726
13 Hunterdon County, New Jersey $36,370
14 San Mateo County, California $36,045
15 Montgomery County, Maryland $35,684
16 San Miguel County, Colorado $35,329
17 Douglas County, Colorado $34,848
18 Los Alamos County, New Mexico $34,646
19 City and County of San Francisco, California $34,556
20 Summit County, Utah $33,767
21 Bergen County, New Jersey $33,638
22 Loudoun County, Virginia $33,530
23 Collin County, Texas $33,345
24 Hamilton County, Indiana $33,109
25 Santa Clara County, California $32,795
26 Oakland County, Michigan $32,534
27 Williamson County, Tennessee $32,496
28 Norfolk County, Massachusetts $32,484
29 Howard County, Maryland $32,402
30 Nassau County, New York $32,151
31 Lake County, Illinois $32,102
32 Eagle County, Colorado $32,011
33 Ozaukee County, Wisconsin $31,947
34 Chester County, Pennsylvania $31,627
35 Delaware County, Ohio $31,600
36 Blaine County, Idaho $31,346
37 DuPage County, Illinois $31,315
38 Town and County of Nantucket, Massachusetts $31,314
39 City of Fairfax, Virginia $31,247
40 Middlesex County, Massachusetts $31,199
41 Collier County, Florida $31,195
42 Monmouth County, New Jersey $31,149
43 Johnson County, Kansas $30,919
44 Montgomery County, Pennsylvania $30,898
45 Contra Costa County, California $30,615
46 San Juan County, Washington $30,603
47 Putnam County, New York $30,127
48 Fulton County, Georgia $30,003
49 Ventura County, California $29,634
50 Martin County, Florida $29,584
51 King County, Washington $29,521
52 Fayette County, Georgia $29,464
53 James City County, Virginia $29,256
54 Waukesha County, Wisconsin $29,164
55 Forsyth County, Georgia $29,114
56 Goochland County, Virginia $29,105
57 Boulder County, Colorado $28,976
58 Albemarle County, Virginia $28,852
59 Palm Beach County, Florida $28,801
60 Routt County, Colorado $28,792
61 Hennepin County, Minnesota $28,789
62 Fauquier County, Virginia $28,757
63 Summit County, Colorado $28,676
64 St. Johns County, Florida $28,674
65 District of Columbia $28,659
66 Rockwall County, Texas $28,573
67 Carver County, Minnesota $28,486
68 Litchfield County, Connecticut $28,408
69 Sarasota County, Florida $28,326
70 Middlesex County, Connecticut $28,251
71 Talbot County, Maryland $28,164
72 Clear Creek County, Colorado $28,160
73 Washington County, Minnesota $28,148
74 Arapahoe County, Colorado $28,147
75 Rockland County, New York $28,082
76 Livingston County, Michigan $28,069
77 Jefferson County, Colorado $28,066
78 Placer County, California $27,963
79 Geauga County, Ohio $27,944
80 Mercer County, New Jersey $27,914
81 Cobb County, Georgia $27,863
82 St. Louis County, Missouri $27,595
83 Anne Arundel County, Maryland $27,578
84 Bucks County, Pennsylvania $27,430
85 Mecklenburg County, North Carolina $27,352
86 Douglas County, Nevada $27,288
87 Indian River County, Florida $27,227
88 Shelby County, Alabama $27,176
89 Washtenaw County, Michigan $27,173
90 Dakota County, Minnesota $27,008
91 Wake County, North Carolina $27,004
92 Sussex County, New Jersey $26,992
93 Union County, New Jersey $26,992
94 Denton County, Texas $26,895
95 Newport County, Rhode Island $26,779
96 City and Borough of Juneau, Alaska $26,719
97 Alameda County, California $26,680
98 Rockingham County, New Hampshire $26,656
99 Suffolk County, New York $26,577
100 Middlesex County, New Jersey $26,535

Highest-income counties and places by state[edit]

For more detailed lists of rankings of counties and places in the individual states, see the following pages:

See also[edit]

Notes and references[edit]

  1. ^ Frasier, Steve (2005). Ruling America. Harvard University Press. ISBN 9780674017474.
  2. ^ "District of Columbia region boasts four richest counties in U.S." American City Business Journals.
  3. ^ "QuickFacts". United States Census Bureau. Retrieved September 7, 2022.
  4. ^ State and County QuickFacts Archived March 4, 2012, at the Wayback Machine. Quickfacts.census.gov (February 20, 2013). Retrieved on July 21, 2013.
  5. ^ Median Household Income in 2009 Inflation-Adjusted Dollars based on the 2005–09 American Community Survey, United States Census Bureau. Retrieved December 24, 2011.
  6. ^ "Census Bureau Homepage". Census.gov. March 26, 2012. Retrieved April 14, 2012.
  7. ^ "Income, Earnings, and Poverty Data From the 2007 American Community Survey" (PDF). Retrieved April 14, 2012.
  8. ^ Matt Woolsey, America's Richest Counties, Forbes.com, 01.22.08, 6:00 PM ET Forbes.com Web site. Retrieved February 8, 2008.
  9. ^ a b "Census 2000 Demographic Profiles". Censtats.census.gov. Archived from the original on July 15, 2011. Retrieved April 14, 2012.
  10. ^ "Interactive Data". U.S. Bureau of Economic Analysis. Retrieved October 7, 2012.
  11. ^ Aristide Economoupolos/The Star-Leder. "N.J. has four of nation's 20 highest-income counties". Nj.com. Retrieved April 14, 2012.


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