Bartlesville is a city in Osage

Osage County, Oklahoma

Osage County is a county in the northern part of the U.S. state of Oklahoma. Coterminous with the Osage Indian Reservation, it is the home of the federally recognized Osage Nation. As of the 2010 census, the population was 47,472 a 6.8 percent increase from 2000, when the population was 44,437...

 and Washington

Washington County, Oklahoma

Washington County is a county located in the U.S. state of Oklahoma. It is, in total area, the smallest county in Oklahoma, adjacent to the largest county in Oklahoma, Osage County. It is the second smallest county, by land only size, i.e., not including water. As of 2000, the population was...

 counties in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of 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...

. The population was 43,070 at the 2010 census

United States Census, 2010

The Twenty-third United States Census, known as Census 2010 or the 2010 Census, is the current national census of the United States. National Census Day was April 1, 2010 and is the reference date used in enumerating individuals...

. Bartlesville is located forty-seven miles north of Tulsa

Tulsa, Oklahoma

Tulsa is the second-largest city in the state of Oklahoma and 46th-largest city in the United States. With a population of 391,906 as of the 2010 census, it is the principal municipality of the Tulsa Metropolitan Area, a region with 937,478 residents in the MSA and 988,454 in the CSA. Tulsa's...

 and very close to Oklahoma's northern border with Kansas

Kansas

Kansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...

. 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 Washington County, in which most of the city lies. Bartlesville is the primary city of the Bartlesville Micropolitan area which consists of Washington County and has a population of 50,976 (2010).