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Geography Boundaries by Year

2018
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2018
Component ID: #ti1168925811
Component ID: #ti1897475333

Legal Areas

The Census Bureau annually conducts the Boundary and Annexation Survey (BAS) to collect information about selected legally defined geographic areas.

Component ID: #ti1943730176

Summary Level
Geographic Area
Vintage of Geographic Area for 2018 ACS Estimate Year

040

State and State Equivalent

January 1, 2018

050

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

January 1, 2018


County Subdivision

067

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

January 1, 2018


Place

160

Incorporated Place

January 1, 2018


American Indian/Alaska Native/Hawaiian Home Land

230

Alaska Native Regional Corporations (ANRCs)

2010 Census

250/252/254

Federal American Indian Reservation (federal AIR)

January 1, 2018

250/252

State American Indian Reservation (state AIR)

2010 Census

251

American Indian Tribal Subdivision, federal AIR

January 1, 2018

250/254

Hawaiian Home Land (HHL)

2010 Census


Other Legal Areas

500

Congressional District, Delegate District DC, Resident Commissioner District PR

January 1, 20181

610/620

State Legislative Districts (Upper and Lower Chambers)

2018 Legislative Session Year

950/960/970

School District (Elementary, Secondary, Unified)*

2017-2018, January 1, 2018

170

Consolidated City

January 1, 2018

Component ID: #ti1943730179

*School district boundaries are updated every two years as part of the School District Review Program.

Component ID: #ti1943730174

1116th Congress of the United States

Component ID: #ti1943730177

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.

Component ID: #ti1943730178

Summary Level
Geographic Area
Vintage of Geographic Area for 2018 ACS Estimate Year

050

County Equivalent (Census Areas in Alaska)

January 1, 2018


County Subdivision

060

Census County Division (CCD)

2010 Census**


Place

160

Census Designated Place (CDP)/Zona Urbana and Comunidad

2010 Census**


American Indian/Alaska Native/Hawaiian Home Land

250/252

Tribal Designated Statistical Area (TDSA)

2010 Census

250/252

State Designated Tribal Statistical Area (SDTSA)

2010 Census

250/252

Oklahoma Tribal Statistical Area (OTSA)

2010 Census

251

American Indian Tribal Subdivision (within OTSA)

2010 Census

256

Tribal Tract

2010 Census**

258

Tribal Block Group

2010 Census**

250/252

Alaska Native Village Statistical Area (ANVSA)

2010 Census


Other Statistical Areas

310

Metropolitan Statistical Area/Micropolitan Statistical Area

August 15, 2017

312

Metropolitan Statistical Area/Micropolitan Statistical Area - Principal City

August 15, 2017*

350

New England City and Town Area (NECTA)

August 15, 2017

352

New England City and Town Area - Principal City

August 15, 2017*

400

Urban Area

2010 Census

140

Census Tract

2010 Census**

150

Census Block Group

2010 Census**

795

Public Use Microdata Area (PUMA)

2010 Census

860

5-digit ZIP Code Tabulation Area (ZCTA)

2010 Census

Component ID: #ti1943730182

*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.

Component ID: #ti1412598412

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

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