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2020

Legal Areas

Legally defined geographic areas used in the ACS are updated on an annual basis from a variety of programs, including: the Boundary and Annexation Survey (BAS), the Redistricting Data Program and the School District Review Program

Summary Level
Geographic Area
Vintage of Geographic Area for 2020 ACS Estimate Year

040    

State and State Equivalent

January 1, 2020

050

County or equivalent (Alaska boroughs, Louisiana parishes, Puerto Rico municipios, independent cities)

January 1, 2020


County Subdivision

067

Township, Minor Civil Division (MCD)/Barrio and Barrio-Pueblo

January 1, 2020


Place

160

Incorporated Place

January 1, 2020


American Indian/Alaska Native/Hawaiian Home Land

230

Alaska Native Regional Corporations (ANRCs)

2020 Census

250/252/254

Federal American Indian Reservation (federal AIR)

January 1, 2020

250/252

State American Indian Reservation (state AIR)

2020 Census

251

American Indian Tribal Subdivision, federal AIR

January 1, 2020

250/254

Hawaiian Home Land (HHL)

2020 Census


Other Legal Areas

500

Congressional District, Delegate District DC, Resident Commissioner District PR

116th Congress of the United States

610/620

State Legislative Districts (Upper and Lower Chambers)

2018 Legislative Session Year

950/960/970

School District (Elementary, Secondary, Unified)

January 1, 2020

170

Consolidated City

January 1, 2020

Statistical Areas

For statistical areas, boundary changes are mostly associated with updates from each decennial census. Statistical areas are designed to have stable boundaries over time.

Summary Level
Geographic Area
Vintage of Geographic Area for 2020 ACS Estimate Year

050

County Equivalent (Census Areas in Alaska)

January 1, 2020


County Subdivision

060

Census County Division (CCD)

2020 Census/1


Place

160

Census Designated Place (CDP)/Zona Urbana and Comunidad

2020 Census/1


American Indian/Alaska Native/Hawaiian Home Land

250/252

Tribal Designated Statistical Area (TDSA)

2020 Census

250/252

State Designated Tribal Statistical Area (SDTSA)

2020 Census

250/252

Oklahoma Tribal Statistical Area (OTSA)

2020 Census

251

American Indian Tribal Subdivision (within OTSA)

2020 Census

256

Tribal Tract

2020 Census/1

258

Tribal Block Group

2020 Census/1

250/252

Alaska Native Village Statistical Area (ANVSA)

2020 Census


Other Statistical Areas

310

Metropolitan Statistical Area/Micropolitan Statistical Area

September 14, 2018/3

312

Metropolitan Statistical Area/Micropolitan Statistical Area - Principal City

September 14, 2018/2,/3

350

New England City and Town Area (NECTA)

September 14, 2018/3

352

New England City and Town Area - Principal City

September 14, 2018/2,/3

400

Urban Area

2010 Census/4

140

Census Tract

2020 Census/1

150

Census Block Group

2020 Census/1

795

Public Use Microdata Area (PUMA)

2010 Census/4

860

5-digit ZIP Code Tabulation Area (ZCTA)

2010 Census/5

/1Changes to the boundaries of legal areas may cause complementary changes to the boundaries of selected statistical areas.

/2While the American Community Survey (ACS) data generally reflect the Office of Management and Budget (OMB) definitions of metropolitan and micropolitan statistical areas; in certain instances the names, codes, and boundaries of the principal cities shown in ACS tables may differ from the OMB definitions due to differences in the effective dates of the geographic entities.

/3The Census Bureau is planning on publishing the updated boundaries for this geographic summary level with the 2023 ACS release.

/4The Census Bureau is planning on publishing the updated boundaries for this geographic summary level with the 2022 ACS release.

/5The Census Bureau is planning on publishing the updated boundaries for this geographic summary level with the 2021 ACS release.

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