Question: Which city is in the same county as Oskaloosa?

full_context: Document 1: Oskaloosa, Kansas: Oskaloosa is a city in and the county seat of Jefferson County, Kansas, United States. As of the 2010 census, the city population was 1,113.
Document 2: Washington, Kansas: Washington is a city in, and the county seat of, Washington County, Kansas, United States. As of the 2010 census, the city population was 1,131.
Document 3: Jeffrey City, Wyoming: Jeffrey City is a census-designated place (CDP) and former uranium mining boomtown located in Fremont County, in the central part of the U.S. state of Wyoming. The town is famous in Wyoming and the American West as symbol of a boomtown that went "bust" very quickly, as the mine was shut down in 1982 and over 95% of the inhabitants left the town within 3 years. The population was 58 at the 2010 census, far lower than its onetime population of several thousand people.
Document 4: Wainwright, Oklahoma: Wainwright is a town in Muskogee County, Oklahoma, United States. The town was named for a local merchant, William Henry Wainwright.The population was 165 at the 2010 census, a decline of 16.2 percent from 197 at the 2000 census.
Document 5: Jefferson Township, Kosciusko County, Indiana: Jefferson Township is one of seventeen townships in Kosciusko County, Indiana. As of the 2010 census, its population was 2,040 and it contained 677 housing units.
Document 6: Ozawkie, Kansas: Ozawkie is a city in Jefferson County, Kansas, United States. As of the 2010 census, the city population was 645. Located adjacent to Perry Lake, Ozawkie formerly existed in a different location but was relocated without the aide of government funding prior to the reservoir's construction.
Document 7: Guthrie, Oklahoma: Guthrie is a city and county seat in Logan County, Oklahoma, United States, and a part of the Oklahoma City Metroplex. The population was 10,191 at the 2010 census, a 2.7 percent increase from the 9,925 at the 2000 census.
Document 8: Wickliffe, Oklahoma: Wickliffe is a census-designated place (CDP) in Mayes County, Oklahoma, United States. The population was 99 at the 2000 census, but only 75 at the 2010 census, a drop of 25 percent.
Document 9: Jennings, Oklahoma: Jennings is a town in Pawnee County, Oklahoma, United States. The population was 363 at the 2010 census, a 2.7 percent decline from 373 at the 2000 census.
Document 10: Jefferson, Ohio: Jefferson is a village in Ashtabula County, Ohio, United States. The population was 3,120 at the 2010 census. It is the county seat of Ashtabula County. Modern-day Jefferson sports the world's only perambulator museum and a historical complex including several restored 19th-century buildings. Joshua Giddings' law office has also been restored as a museum. Annual village events include the Ashtabula County Fair, the Strawberry Festival, Jefferson Days, and the Covered Bridge Festival.
Document 11: Ottawa, Kansas: Ottawa is a city in, and the county seat of, Franklin County, Kansas, United States. It is located on both banks of the Marais des Cygnes River near the center of Franklin County. As of the 2010 census, the city population was 12,649.
Document 12: Hastings, Oklahoma: Hastings is a town in Jefferson County, Oklahoma, United States. The population was 143 at the 2010 census, a decline from 155 at the 2000 census.
Document 13: Eufaula, Oklahoma: Eufaula is a city in and county seat of McIntosh County, Oklahoma, United States. The population was 2,813 at the 2010 census, an increase of 6.6 percent from 2,639 in 2000. Eufaula is in the southern part of the county, north of McAlester and south of Muskogee.
Document 14: Waurika, Oklahoma: Waurika is the county seat of Jefferson County, Oklahoma, United States. The population was 2,064 at the 2010 census, a 4.36 percent decrease from 2,158 at the 2000 census.
Document 15: Warner, Oklahoma: Warner is a town in Muskogee County, Oklahoma, United States. The population was 1,641 at the 2010 census, an increase of 14.8 percent from 1,430 at the 2000 census. The town is home to one of the two Connors State College campuses.
ground_truth: Waurika
sub_queries: Oskaloosa >> located in the administrative territorial entity Answer: Jefferson County
Jefferson County >> contains administrative territorial entity Answer: Waurika