The United States acquired the area of Wyoming from France as part of the Louisiana Purchase in 1803, from Great Britain as part of a treaty in 1846, and from territory ceded by Mexico in 1848. Wyoming Territory was organized from part of Dakota, Idaho, and Utah territories on July 25, 1868, with generally the same boundary as the present state.

Census data are available for Wyoming beginning with the 1870 census.

Census data for the legally established state of Wyoming are available beginning with the 1900 census.

AMERICAN INDIAN AREAS

Wyoming has one American Indian reservation with off-reservation trust land.

METROPOLITAN AND MICROPOLITAN STATISTICAL AREAS AND RELATED STATISTICAL AREAS

Wyoming has two metropolitan statistical areas and seven micropolitan statistical areas.

COUNTIES

There are 23 counties in Wyoming.  All counties are functioning governmental units, each governed by a board of commissioners.

COUNTY SUBDIVISIONS

There are 71 county subdivisions in Wyoming. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units.  CCDs were first established in Wyoming for the 1960 census.  Prior to 1960, the minor civil divisions used in the census include election precincts and election districts.

PLACES

Wyoming has 203 places; 99 incorporated places and 104 census designated places (CDPs).  The incorporated places consist of 19 cities and 80 towns.  The minimum population for incorporation in Wyoming is 500. 

CENSUS TRACTS/BLOCK GROUPS/BLOCKS

Wyoming has 132 census tracts, 410 block groups, and 86,204 census blocks.

CONGRESSIONAL DISTRICTS

For the 111^th Congress (January 2009-January 2011), Wyoming had one congressional district.  For the 113^th Congress (January 2013-January 2015), Wyoming continues to have one congressional district as a result of reapportionment based on the 2010 Census.

SCHOOL DISTRICTS

Wyoming has 49 unified school districts.

STATE LEGISLATIVE DISTRICTS

There are 30 state senate districts and 60 state house districts in Wyoming.

URBAN AREAS

Wyoming has 22 urban areas; 2 urbanized areas and 20 urban clusters.

ZIP CODE TABULATION AREAS

There are 179 ZIP Code tabulation areas (ZCTAs) in Wyoming.

¹  Source:  U.S. Department of Commerce, Bureau of the Census, Fourteenth Census of the United States, 1923
²  Source:  U.S. Census Bureau, recomputation for historical county level data which relied upon aggregate county level population data with an estimated county centroid resulting in a possible error of up to one mile.
³  Source:  U.S. Department of Commerce, Bureau of the Census, Centers of Population for States and Counties, 1974
⁴  Source:  U.S. Census Bureau, Geography Division, recomputation from archived national block group/enumeration area data resulting in a possible error of up to 1,000 feet.
⁵  Source:  U.S. Census Bureau, Geography Division, recomputation from archived national block group data resulting in a possible error of up to 1,000 feet.
⁶  Source:  U.S. Census Bureau, computation from national block-level data