Anadarko is a city in Caddo County

Caddo County, Oklahoma

Caddo County is a county located in the U.S. state of Oklahoma. As of 2000, the population was 30,150. Its county seat is Anadarko. It is named after the Caddo tribe who were settled here on the 1870s...

, Oklahoma

Oklahoma

Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

, United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The population was 6,645 at the 2000 census

United States Census, 2000

The Twenty-second United States Census, known as Census 2000 and conducted by the Census Bureau, determined the resident population of the United States on April 1, 2000, to be 281,421,906, an increase of 13.2% over the 248,709,873 persons enumerated during the 1990 Census...

. It is the county seat

County seat

A county seat is an administrative center, or seat of government, for a county or civil parish. The term is primarily used in the United States....

 of Caddo County

Caddo County, Oklahoma

Caddo County is a county located in the U.S. state of Oklahoma. As of 2000, the population was 30,150. Its county seat is Anadarko. It is named after the Caddo tribe who were settled here on the 1870s...

.
Anadarko got its name when its post office was established in 1873. The designation came from the Nadarko Indians, a branch of the Caddo

Caddo

The Caddo Nation is a confederacy of several Southeastern Native American tribes, who traditionally inhabited much of what is now East Texas, northern Louisiana and portions of southern Arkansas and Oklahoma. Today the Caddo Nation of Oklahoma is a cohesive tribe with its capital at Binger, Oklahoma...

, and the "A" was added by clerical error.

In 1871, the Wichita Agency was reestablished on the north bank of the Washita River

Washita River

The Washita River is a river in Texas and Oklahoma, United States. The river is long and terminates into Lake Texoma in Johnston County , Oklahoma and the Red River.-Geography:...

 after being destroyed in the Civil War

Civil war

A civil war is a war between organized groups within the same nation state or republic, or, less commonly, between two countries created from a formerly-united nation state....

. The Wichita Agency administered the affairs of the Wichita, Caddo

Caddo

The Caddo Nation is a confederacy of several Southeastern Native American tribes, who traditionally inhabited much of what is now East Texas, northern Louisiana and portions of southern Arkansas and Oklahoma. Today the Caddo Nation of Oklahoma is a cohesive tribe with its capital at Binger, Oklahoma...

 and other tribes.