Open Census MCP Server

United States Census Bureau | An official website of the United States Government Geography Boundaries by Year Vintage of Geographic Areas for ACS Estimates The ACS typically publishes estimates using the latest available geographic boundaries (also known as "vintages"). For ACS 5-year estimates, use the last year of the estimate period to determine the vintage. For example, the following datasets use the same vintages of geographic boundaries: 2023 ACS 1-year estimates 2019-2023 ACS 5-year estimates To learn more about geographic concepts used in the ACS, check out our geographic handbook Geography and the American Community Survey: What Data Users Need to Know [/programs- surveys/acs/guidance/handbooks/geography.html] . 2021 On this page Vintage of Geographic Areas for ACS Estimates [#vintage-of-geographic-areas-for-acs-estimates] 2021 [#2021] Legal Areas [#legal-areas] Statistical Areas [#statistical-areas] You May Be Interested In [#you-may-be-interested-in] 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) [/programs-surveys/bas.html] , the Redistricting Data Program [/programs-surveys/decennial-census/about/rdo.html]  and the School District Review Program [/programs- surveys/sdrp.html] .  Summar y Level Geographic Area 040     State and State Equivalent 050 County or equivalent (Alaska boroughs, Louisiana parishes, Puerto Rico municipios, independent cities) Vintage of Geographic Area for 2021 ACS Estimate Year January 1, 2021 January 1, 2021 County Subdivision 067 Township, Minor Civil Division (MCD)/Barrio and Barrio-Pueblo January 1, 2021 Place 160 Incorporated Place January 1, 2021 American Indian/Alaska Native/Hawaiian Home Land 230 Alaska Native Regional Corporations (ANRCs) 250/252/25 Federal American Indian Reservation (federal AIR) 4 250/252 State American Indian Reservation (state AIR) 251 American Indian Tribal Subdivision, federal AIR 250/254 Hawaiian Home Land (HHL) Other Legal Areas 2020 Census January 1, 2021 2020 Census January 1, 2021 2020 Census 500 Congressional District, Delegate District DC, Resident Commissioner District PR 116th Congress of the United States /4 [#fn4] 610/620 State Legislative Districts (Upper and Lower Chambers) 2018 Legislative Session Year /4 [#fn4] 950/960/97 School District (Elementary, Secondary, Unified) January 1, 2021 0 170 Consolidated City January 1, 2021 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. Summar y Level Geographic Area Vintage of Geographic Area for 2021 ACS Estimate Year 050 County Equivalent (Census Areas in Alaska) January 1, 2021 County Subdivision 060 Census County Division (CCD) 2020 Census /1 [#fn1] Place 160 Census Designated Place (CDP)/Zona Urbana and Comunidad 2020 Census /1 [#fn1] 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 251 256 258 American Indian Tribal Subdivision (within OTSA) 2020 Census Tribal Tract Tribal Block Group 2020 Census /1 [#fn1] 2020 Census /1 [#fn1] 250/252 Alaska Native Village Statistical Area (ANVSA) 2020 Census Other Statistical Areas 310 312 350 352 400 140 150 795 860 Metropolitan Statistical Area/Micropolitan Statistical Area March 6, 2020 /3 [#fn3] Metropolitan Statistical Area/Micropolitan Statistical Area - Principal City March 6, 2020 /2 [#fn2] ,/3 [#fn3] New England City and Town Area (NECTA) March 6, 2020 New England City and Town Area - Principal City March 6, 2020 /2 [#fn2] Urban Area Census Tract Census Block Group Public Use Microdata Area (PUMA) 2010 Census /4 [#fn4] 2020 Census /1 [#fn1] 2020 Census /1 [#fn1] 2010 Census /4 [#fn4] 5-digit ZIP Code Tabulation Area (ZCTA) 2020 Census /1 Changes to the boundaries of legal areas may cause complementary changes to the boundaries of selected statistical areas. /2 While 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. /3 The Census Bureau is planning on publishing the updated boundaries for this geographic summary level with the 2023 ACS release. /4 The Census Bureau is planning on publishing the updated boundaries for this geographic summary level with the 2022 ACS release. Related Information American Community Survey Data [/programs-surveys/acs/data.html] Table & Geography Changes [/programs-surveys/acs/technical-documentation/table-and-geography-changes.html] USER NOTES Change to County-Equivalents in the State of Connecticut for 2022 ACS [/programs-surveys/acs/technical-documentation/user- notes/2023-01.html] You May Be Interested In Contact Updates Contact Us Email Updates Share Your ACS Data Story Learn how to contact the American Community Survey if you Sign up to receive email updates about the American Community Tell us your story about how you use data from the American [/programs- surveys/acs/contact.html] [/programs- surveys/acs/news/email- updates.html] [/programs-surveys/acs/share- your-acs-data-story.html] Page Last Revised - August 28, 2024