List of principal and guide meridians and base lines of the United States

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"Guide Meridian" redirects here. For the highway, see Washington State Route 539.

This is a list of principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.

List of meridians[edit]

Primarily from the United States Government Printing Office Style Manual.[1] State names usually signify only parts of each listed state, unless otherwise indicated.

Based on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum.

Principal Meridians[edit]

Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS.
Meridian W. Longitude Associated Baseline N. Latitude Adopted Area surveyed
First principal meridian 84°48′11″W 40°59′22″N 1819 Ohio(northwest) and Indiana(sliver of southeast)[2]
Second principal meridian [2] 86°27′21″W 38°28′14″N 1805 Illinois(far eastern) and Indiana(almost all)
Third principal meridian 89°08′54″W Centralia baseline 38°28′27″N 1805 Illinois(most)[2]
Fourth principal meridian 90°27′11″W Beardstown baseline 40°00′50″N 1815 Illinois(west of Illinois River and Third principal meridian)[2]
Fourth principal meridian (extended) 90°25′37″W Illinois–Wisconsin border 42°30′27″N 1831 Minnesota(northeastern) and Wisconsin(all)[2]
Fifth principal meridian 91°03′07″W 34°38′45″N 1815 Arkansas(all), Iowa(all), Minnesota(most), Missouri(all), North Dakota(all), and South Dakota(east half)[3]
Sixth principal meridian 97°22′08″W 40°00′07"N 1855 Colorado(most), Kansas(all), Nebraska(all), South Dakota(some of southern), and Wyoming(most)[4]
Black Hills meridian 104°03′16″W Black Hills baseline 43°59′44″N 1878 South Dakota (western)[3]
Boise meridian[1] 116°23′35″W 43°22′21″N 1867[5] all of Idaho
Chickasaw meridian 89°14′47″W 35°01′58″N 1833 Mississippi[6]
Choctaw meridian 90°14′41″W Choctaw baseline 31°52′32″N 1821 Mississippi[6]
Cimarron meridian 103°00′07″W 36°30′05″N 1881 Oklahoma (panhandle) [7]
Copper River meridian 145°18′37″W 61°49′04″N 1905 Alaska[8]
Fairbanks meridian 147°38′25.949″W 64°51′50.048″N 1910 Alaska[8]
Gila and Salt River meridian 112°18′19″W 33°22′38″N 1865 Arizona (most)[9]
Humboldt meridian 124°07′10″W 40°25′02″N 1853 California[10]
Huntsville meridian 86°34′16″W 34°59′27″N 1807 Alabama and Mississippi[6]
Indian meridian 97°14′49″W 34°29′32″N 1870 Oklahoma (most)[7]
Kateel River meridian 158°45′31.014″W 65°26′16.374″N 1956 Alaska[8]
Louisiana meridian 92°24′55″W 31°00′31″N 1807 Louisiana[6]
Michigan meridian 84°21′53″W 42°25′28″N 1815 Michigan and Ohio[2]
Montana meridian 111°39′33″W 45°47′13″N 1867 Montana[11]
Mount Diablo meridian 121°54′47″W 37°52′54″N 1851 California and Nevada[10]
Navajo meridian 108°31′59"W Navajo baseline 35°44′56"N 1869 northeastern Arizona[9] and formerly[12] northwestern New Mexico[1]
New Mexico principal meridian 106°53′12″W 34°15′35″N 1855 New Mexico, Colorado(SW)[13]
St. Helena meridian 91°09′36″W 30°59′56″N 1819 Louisiana[6]
St. Stephens meridian 88°01′20″W St. Stephens baseline 30°59′51″N 1805 Alabama and Mississippi[6]
Salt Lake meridian 111°53′27″W 40°46′11″N 1855 Utah (most)[14]
San Bernardino meridian[10] 116°55′48″W 34°07′13″N 1852 California[1] and a some townships in Arizona[5]
Seward meridian 149°21′26″W 60°07′37″N 1911 Alaska[8]
Tallahassee meridian 84°16′38″W 30°26′03″N 1824 Florida and Alabama[6]
Uintah meridian 109°56′06″W 40°25′59″N 1875 Utah (part of NE)[14]
Umiat meridian 152°00′04.551″W 69°23′29.654″N 1956 Alaska[8]
Ute meridian 108°31′59″W 39°06′23″N 1880 Colorado[4]
Washington meridian 91°09′36″W 30°59′56″N 1803 Mississippi[6]
Willamette meridian 122°44′34″W Willamette baseline 45°31′11″N 1851 Oregon and Washington[15]
Wind River meridian 108°48′49″W 43°00′41″N 1875 part of western Wyoming[4]

Guide Meridians[edit]

Meridian W. Longitude Associated Baseline N. Latitude Adopted Area surveyed
Ashley guide meridian Utah[1]
Beaverhead guide meridian Montana[1]
Belt Mountain guide meridian Montana[1]
Big Hole guide meridian Montana[1]
Bitterroot guide meridian Montana[1]
Boulder guide meridian Montana[1]
Browning guide meridian Montana[1]
Buffalo Creek guide meridian Montana[1]
Carson River guide meridian Nevada[1]
Castle Valley guide meridian Utah[1]
Colorado guide meridian Utah[1]
Columbia guide meridian Washington[1]
Colville guide meridian Washington[1]
Coulson guide meridian Montana[1]
Deer Lodge guide meridian Montana[1]
Deschutes meridian Oregon[1]
Emery Valley guide meridian Utah[1]
Flathead guide meridian Montana[1]
Fort Belknap guide meridian Montana[1]
Fremont Valley guide meridian Utah[1]
Grand River guide meridian Utah[1]
Grande Ronde guide meridian Oregon[1]
Green River guide meridian Utah[1]
Haystack Butte guide meridian Montana[1]
Helena guide meridian Montana[1]
Henry Mountain guide meridian Utah[1]
Horse Plains guide meridian Montana[1]
Humboldt River guide meridian Nevada[1]
Jefferson guide meridian Montana[1]
Judith guide meridian Montana[1]
Kanab guide meridian Utah[1]
Kolob guide meridian Utah[1]
Little Porcupine guide meridian Montana[1]
Maginnis guide meridian Montana[1]
Musselshell guide meridian Montana[1]
New Mexico guide meridian New Mexico and Colorado[1]
Panguitch guide meridian Utah[1]
Passamari guide meridian Montana[1]
Pine Valley guide meridian Utah[1]
Red Rock guide meridian Montana[1]
Reese River guide meridian Nevada[1]
Ruby Valley guide meridian Nevada[1]
Sevier Lake guide meridian Utah[1]
Shields River guide meridian Montana[1]
Smith River guide meridian Montana[1]
Snake Valley guide meridian Utah[1]
Square Butte guide meridian Montana[1]
Sweet Grass guide meridian Montana[1]
Teton guide meridian Montana[1]
Valley Creek guide meridian Montana[1]
Wah Wah guide meridian Utah[1]
Willow Springs guide meridian Utah[1]
Yantic guide meridian Montana[1]
Yellowstone guide meridian Montana[1]

Ohio Lands[edit]

Some parts of the Ohio Lands (now Ohio) were laid out in survey townships, but based on other points not listed above:

See also[edit]


  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf "18. Geologic Terms and Geographic Divisions". Style Manual (29th ed. ed.). United States: Government Printing Office. 2000. p. 346.  GPO stock number 021-000-00178-3 (paper).
  2. ^ a b c d e f
  3. ^ a b
  4. ^ a b c
  5. ^ a b c d e f g h i "Part 5: Public Land Survey System". National Mapping Program Technical Instructions: Standards for USGS and USDA Forest Service Single Edition Quadrangle Maps (Draft for Implementation ed.). March 2003. pp. 5A–2–5A–4. Retrieved 2008-10-31. 
  6. ^ a b c d e f g h
  7. ^ a b
  8. ^ a b c d e
  9. ^ a b
  10. ^ a b c
  11. ^
  12. ^ Hubbard, Bill, Jr. (2009) "Navajo meridian, 1869" American Boundaries: The nation, the states, the rectangular survey University of Chicago Press, Chicago, p. 338, ISBN 978-0-226-35591-7
  13. ^
  14. ^ a b
  15. ^