The United States acquired the area of Oklahoma from France as part of the Louisiana Purchase in 1803. Part of present-day Oklahoma, which had been included in Arkansas Territory, was ceded to Spain by conclusion of a treaty in 1819; the ceded area was reacquired as part of the annexation of Texas in 1845. The area of Oklahoma was part of unorganized territory designated as Indian Country or Indian Territory on June 20, 1834, although this conflicted with territory already included within Missouri Territory. Oklahoma Territory was organized on May 2, 1890, from the western part of Indian Territory and the Public Land Strip (the panhandle, which was sold to the United States by Texas), and resulted in the territory being in two pieces. The territory was enlarged with the addition of the Cherokee Outlet, which joined Oklahoma Territory into a single area. The Supreme Court affirmed the claim of Oklahoma to the Greer County area in southwest Oklahoma in 1896. Oklahoma Territory and the remaining Indian Territory were combined, and Oklahoma was admitted to the Union on November 16, 1907, as the 46th state, with generally the same boundary as the present state. A boundary dispute with Texas was settled in 1930, deleting a narrow strip of territory from Oklahoma.
Census data are available for Oklahoma beginning with the 1890 census. The 1890 and 1900 census populations reported for Oklahoma include the population for Indian Territory. The population of Oklahoma Territory as legally established was 398,331 in 1900 and 78,475 in 1890. The population of Indian Territory as legally established was 392,060 in 1900 and 180,182 in 1890. The Census Bureau conducted a special census of the Oklahoma and Indian territories on July 7, 1907. The population of the entire area was 1,414,177.
Data for the legally established state of Oklahoma are available beginning with the 1910 census.
See: Geographic Terms & Concepts
Counties & County Equivalents
Interactive Map of Oklahoma Counties | Static Overview Map of Oklahoma Counties
There are 77 counties in Oklahoma. All counties are functioning governments, each governed by a board of county commissioners.
There are 305 county subdivisions in Oklahoma. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units.
Places (Incorporated Cities, Towns & Census Designated Places (CDPs))
Oklahoma has 733 places, 597 incorporated places and 136 census designated places (CDPs). The incorporated places consist of 164 cities and 433 towns. There are four inactive towns - Erin Springs, New Woodville, Oak Grove, and Smithville. Cities have a minimum population of 1,000 and villages have a population less than 1,000.
Alphabetical List of Cities, Towns, CDPs and Other Populated Places
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q, R | S | T | U, V | W, X, Y, Z
Oklahoma Civil Features
Oklahoma Civil Features: Political Subdivisions, Native Areas, Land Grants, etc. - sorted by Census Class Codes.
Metropolitan and Micropolitan Statistical Areas
There are 4 Metropolitan and 17 Micropolitan Statistical Areas in Oklahoma. OK Metopolitan & Micropolitan Areas
Oklahoma ZIP Code Tabulation Areas
There are 649 ZIP Code tabulation areas (ZCTAs) in Oklahoma. View Oklahoma ZIP Codes and ZIP Code Maps.
Oklahoma has 106 elementary school districts and 426 unified school districts. View Oklahoma Public and Private Schools.
Oklahoma has 5 congressional districts. An interactive map shows the contact information for each Representative as well as the boundaries for each Oklahoma district. View Map of Oklahoma Congressional Districts.
State Legislative Districts
There are 48 state senate districts and 101 state house districts in Oklahoma.
American Indian Areas
Oklahoma has 1 federally recognized American Indian area reservation, 25 Oklahoma tribal statistical areas (OTSAs), and 4 joint-use OTSAs. The OTSAs represent the former reservations.