Smithsonian trinomial

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Smithsonian trinomials are unique identifiers assigned to archaeological sites in many states in the United States. They are composed of one or two digits coding for the state, typically two letters coding for the county or county-equivalent within the state, and one or more sequential digits representing the order in which the site was listed in that county.[1][2] The Smithsonian Institution developed the site number system in the 1930s and 1940s but no longer maintains the system. (Trinomials are now assigned by the individual states.) The 48 states then in the union were assigned numbers in alphabetical order. Alaska was assigned number 49 and Hawaii was assigned number 50 after those states were admitted to the union. There are no Smithsonian trinomial numbers assigned for the District of Columbia or any United States territories.[3][4]

Most states use trinomials of the form "nnAAnnnn", but some specify a space or dash between parts of the identifier, i.e., "nn AA nnnn" or "nn-AA-nnnn". Some states use variations of the trinomial system. Arizona, California, Connecticut, Maine, Rhode Island and Vermont use two-letter abbreviations of the state name instead of the Smithsonian number. Alaska uses three-letter abbreviations for USGS map quadrangles in place of the county code. Arizona uses a five-part identifier based on USGS maps, specifying quadrangles, then rectangles within a quadrangle, a sequential number within the rectangle, and a code identifying the agency issuing the sequential number. California uses a three-letter abbreviation for counties. Connecticut and Rhode Island do not use any sub-state codes, with site identifiers consisting of the state abbreviation and a sequential number series for the whole state. Delaware uses a single letter code for counties and adds a block code (A-K) within each county, with sequential numbers for each block. Hawaii uses a four-part identifier, "50" for the state, a two-digit code for the island, then a two-digit code to designate the USGS topographical quad, plus a four digit sequential site number for sites on each island.

Archaeological site identification codes used by states[edit]

State Format County or equivalent codes
Alabama 1AAnnnn[5] AA: Alabama County Abbreviation for Archaeological Site Number Designation
Alaska 49‑AAA‑nnnn[6] AAA: Alaska Quad Map
Arizona AZ AA:nn:nn(XXX)[7] AA:nn: Arizona Quad Names and Numbers
Arkansas 3AAnnnn List of counties in Arkansas
California CA‑AAA‑nnnn[8] AAA: California Counties and their Abbreviations
Colorado 5AAnnnn[9] List of counties in Colorado
Connecticut CT‑nnnnn No county code; state abbreviation and a sequential number only
Delaware 7ABnnnn[10] A: K = Kent County, N = New Castle County, and S = Sussex County. B: Figure 25: Map of blocks
Florida 8AAnnnn[11] List of counties in Florida
Georgia 9AAnnnn[12] AA: County Abbreviation Codes
Hawaii 50‑nn[1]‑nn‑nnnn[13] nn[1]: 10 = Hawaii, 20 = Kaho'olawi, 30 = Kaua'i, 40 = Lana'i, 50 = Maui, 60 = Moloka'i, 80 = O'ahu, 91 = Necker, 92 = Nihoa[14]
Idaho 10AAnnnn
Illinois 11AAnnnn[15] List of counties in Illinois
Indiana 12AAnnnn[15] List of counties in Indiana
Iowa 13AAnnnn[16] AA: Iowa County Abbreviations for Site Designation
Kansas 14AAnnnn[17] AA: Kansas County Abbreviations for Archeological Trinomials
Kentucky 15AAnnnn[15] List of counties in Kentucky
Louisiana 16AAnnnn[18] List of parishes in Louisiana
Maine ME-nn-nn
Maryland 18AAnnnn[19] List of counties in Maryland
Massachusetts 19-AA-nnnn
Michigan 20AAnnnn[20] List of counties in Michigan
Minnesota 21AAnnnn[21] AA: Trinomial Site Designations for MN Counties
Mississippi 22‑AA‑nnnn[22] List of counties in Mississippi
Missouri 23AAnnnn List of counties in Missouri
Montana 24AAnnnn[23]
Nebraska 25AAnnnn[24]
Nevada 26AAnnnn[25]
New Hampshire 27‑AA‑nnnn[26] AA: Belknap (BK) · Carroll (CA) · Cheshire (CH) · Coos (CO) · Grafton (GR) · Hillsborough (HB) · Merrimack (MR) · Rockingham (RK) · Strafford (ST) · Sullivan (SU)
New Jersey 28AAnnnn
New Mexico 29AAnnnn
North Carolina[27] 31AAnnnn AA: Alamance (AM) · Alexander (AX) · Alleghany (AL) · Anson (AN) · Ashe (AH) · Avery (Av) · Beaufort (BF) · Bertie (BR) · Bladen (BL) · Brunswick (BW) · Buncombe (BN) · Burke (BK) · Cabarrus (CA) · Caldwell (CW) · Camden (CM) · Carteret (CR) · Caswell (CS) · Catawba (CT) · Chatham (CH) · Cherokee (CE) · Chowan (CO) · Clay (CY) · Cleveland (CL) · Columbus (CB) · Craven (CV) · Cumberland (CD) · Currituck (CK) · Dare (DR) · Davidson (DV) · Davie (DE) · Duplin (DP) · Durham (DH) · Edgecombe (ED) · Forsyth (FY) · Franklin (FK) · Gaston (GS) · Gates (GA) · Graham (GH) · Granville (GV) · Greene (GR) · Guilford (GF) · Halifax (HX) · Harnett (HT) · Haywood (HW) · Henderson (HN) · Hertford (HF) · Hoke (HK) · Hyde (HY) · Iredell (ID) · Jackson (JK) · Johnston (JT) · Jones (JN) · Lee (LE) · Lenoir (LR) · Lincoln (LN) · Macon (MA) · Madison (MD) · Martin (MT) · McDowell (MC) · Mecklenburg (MK) · Mitchell (ML) · Montgomery (MG) · Moore (MR) · Nash (NS) · New Hanover (NH) · Northampton (NP) · Onslow (ON) · Orange (OR) · Pamlico (PM) · Pasquotank (PK) · Pender (PD) · Perquimans (PQ) · Person (PR) · Pitt (PT) · Polk (PL) · Randolph (RD) · Richmond (RH) · Robeson (RB) · Rockingham (RK) · Rowan (RW) · Rutherford (RF) · Sampson (SP) · Scotland (SC) · Stanly (ST) · Stokes (SK) · Surry (SR) · Swain (SW) · Transylvania (TV) · Tyrrell (TY) · Union (UN) · Vance (VN) · Wake (WA) · Warren (WR) · Washington (WH) · Watauga (WT) · Wayne (WY) · Wilkes (WK) · Wilson (WL) · Yadkin (YD) · Yancey (YC)
North Dakota 32AAnnnn[28] AA: NDCRS Site Form Training Manual - Section I: Site Identification - County Codes (Page 10)
Ohio 33‑AA‑nnnn[29] AA: Appendix B: County Codes (OAI Codes) (Page 61)
Oregon[30] 35‑AA‑nnnn List of counties in Oregon
Pennsylvania[31] 36‑AA‑nnnn List of counties in Pennsylvania
Rhode Island RI‑nnnn No county code; state abbreviation and a sequential number only
South Carolina 38‑AA‑nnnn List of counties in South Carolina
South Dakota 39AAnnnn[32]
Tennessee[33] 40AAnnnn AA: County Abbreviations for Archaeological Site Numbers
Texas[34] 41‑AA‑nnnn AA: Texas County Abbreviations
Utah[35] 42‑AA‑nnnn List of counties in Utah
Vermont[36] VT‑AA‑nnnn AA: Addison (AD) · Bennington (BE) · Caledonia (CA) · Chittenden (CH) · Essex (ES) · Franklin (FR) · Grand Isle (GI) · Lamoille (LA) · Orange (OR) · Orleans (OL) · Rutland (RU) · Washington (WA) · Windham (WD) · Windsor (WN)
Virginia 44-AA-nnnn
Washington[37] 45‑AA‑nnnn List of counties in Washington
West Virginia[38] 46‑AA‑nnnn List of counties in West Virginia
Wisconsin[39] 47‑AA‑nnnn List of counties in Wisconsin
Wyoming[40] 48AAnnnn List of counties in Wyoming and also YE for sites within Yellowstone National Park


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