Question: The County seat of Grant County, Kansas has a population of what?

full_context: Document 1: Kansas City, Kansas: Kansas City is the third-largest city in the state of Kansas, the county seat of Wyandotte County, and the third-largest city of the Kansas City metropolitan area. Kansas City, Kansas is abbreviated as "KCK" to differentiate it from Kansas City, Missouri. It is part of a consolidated city-county government known as the "Unified Government". Wyandotte County also includes the independent cities of Bonner Springs and Edwardsville. As of the 2010 census, the city had a population of 145,786 residents. It is situated at Kaw Point, which is the junction of the Missouri and Kansas rivers.
Document 2: Johnson County, Kansas: Johnson County (county code JO) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 544,179, making it the most populous county in Kansas. Its county seat is Olathe, and its most populous city is Overland Park.
Document 3: Grant County, Kansas: Grant County (county code GT) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 7,829. Its county seat and only city is Ulysses.
Document 4: Ellis County, Kansas: Ellis County (county code EL) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 28,452. Its county seat and most populous city is Hays.
Document 5: Galena, Illinois: Galena is the largest city in and the county seat of Jo Daviess County, Illinois, with a population of 3,429 at the 2010 census. A 581 acre section of the city is listed on the National Register of Historic Places as the Galena Historic District. It is named for the mineral galena, which was mined by Native Americans in the area for over a thousand years. Owing to these deposits, Galena was the site of the first major mineral rush in the United States. The first American settler arrived in 1821, and by 1828, the population was estimated at 10,000, rivaling the population of Chicago at the time. The city emerged as the largest steamboat hub on the Mississippi River north of St. Louis, Missouri. Galena was the home of Ulysses S. Grant and eight other Civil War generals. Today, the city is a tourist destination known for its history, architecture, and resorts.
Document 6: Sedgwick County, Kansas: Sedgwick County (county code: SG) is a county located in the U.S. state of Kansas. As of the 2010 census, the population was 498,365, making it the second-most populous county in Kansas. The county seat is Wichita, the most populous city in the state.
Document 7: Osage County, Kansas: Osage County (county code OS) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 16,295. Its county seat is Lyndon, and its most populous city is Osage City. The county was originally organized in 1855 as Weller County, and was renamed in 1859 after the Osage River that runs through it, which is itself named for the Osage Native American Tribe.
Document 8: Ulysses S. Grant: Ulysses S. Grant, born Hiram Ulysses Grant , (April 27, 1822 – July 23, 1885) was the Commanding General of the United States Army at the end of the American Civil War and later the 18th President of the United States from 1869 to 1877. As Commanding General, Grant worked closely with President Abraham Lincoln to lead the Union Army to victory over the Confederacy in the Civil War. Supported by Congress, Grant implemented Reconstruction, often at odds with President Andrew Johnson. Twice elected president, Grant led the Republicans in their effort to remove the vestiges of Confederate nationalism and slavery, protect African-American citizenship, and support economic prosperity. Although his presidency has often been criticized for multiple administration scandals and for his failure to alleviate the economic depression following the Panic of 1873, he is regarded as a President who performed relatively well in the context of his time and pursued justice for all.
Document 9: Brown County, Kansas: Brown County (county code BR) is a county located in the northeast portion of the U.S. state of Kansas. As of the 2010 census, the county population was 9,984. Its county seat and most populous city is Hiawatha. Brown County is the location of the Kickapoo Indian Reservation of Kansas, the majority of the Sac and Fox Reservation and the majority of the Iowa Reservation of Kansas and Nebraska.
Document 10: Wyandotte County, Kansas: Wyandotte County ( ; county code WY) is a county located in the U.S. state of Kansas. As of the 2010 census, the population was 157,505, making it the fourth-most populous county in Kansas. Its county seat and most populous city is Kansas City, with which it shares a unified government. Wyandotte County lies immediately west of Kansas City, Missouri.
Document 11: Lawrence, Kansas: Lawrence is the county seat of Douglas County and sixth largest city in Kansas. It is located in the northeastern sector of the state, next to Interstate 70, between the Kansas and Wakarusa Rivers. As of the 2010 census, the city's population was 87,643. Lawrence is a college town and the home to the University of Kansas and Haskell Indian Nations University.
Document 12: Ulysses, Kansas: Ulysses (pronounced ) is a city in and the county seat of Grant County, Kansas, United States. It is named after Ulysses S Grant, the 18th President of the United States. As of the 2010 census, the city population was 6,161.
Document 13: Allen County, Kansas: Allen County (county code AL) is a county located in southeast portion of the U.S. state of Kansas. It is 504 square miles, or 322,560 acres in size. As of the 2010 census, the population was 13,371. Its county seat and most populous city is Iola.
Document 14: Chase County, Kansas: Chase County (county code CS) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 2,790. Its county seat and most populous city is Cottonwood Falls. The center of population of Kansas is located in Chase County, about four miles north of Strong City.
Document 15: Grant County, North Dakota: Grant County is a county located in the U.S. state of North Dakota. As of the 2010 census, the population was 2,394. Its county seat is Carson. Until November 28, 1916, Grant County was a part of Morton County. The county was named in honor of General Ulysses S. Grant.
ground_truth: 6,161