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.
Chautauqua County (county code CQ) is a county located in Southeast Kansas.
 As of the 2010 census, the county population was 3,669.
 Its county seat and most populous city is Sedan.
 Chautauqua County is named for Chautauqua County, New York, the birthplace of Edward Jaquins, a Kansas politician who was instrumental in getting the county established.
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.
Pilsen is a town in Bayfield County, Wisconsin, United States.
 The population was 210 at the 2010 census.
 The unincorporated community of Moquah is located in the town.
Clark Township is a township in Marion County, Kansas, United States.
 As of the 2010 census, the township population was 147, including the west side of Pilsen.
Pilsen is an unincorporated community in Marion County, Kansas, United States.
 It is named after the city Plzeň (German: "Pilsen") in Czech Republic, formerly Bohemia.
 The community has always had a population less than 100, which is too low to incorporate as a city in Kansas.
Marion County (standard abbreviation: MN) is a county located in the U.S. state of Kansas.
 As of the 2010 census, the county population was 12,660.
 The county seat is Marion.
 The county was named in honor of Francis Marion, a Brigadier General of the American Revolutionary War, known as the "Swamp Fox".
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.
Lane County (standard abbreviation: LE) is a county located in the U.S. state of Kansas.
 As of the 2010 census, the county population was 2,150, making it the third-least populous county in Kansas.
 The county seat is Dighton, the only city in the county.
 The county was named after James H. Lane who was a leader of the Jayhawker abolitionist movement and served as one of the first U.S. Senators from Kansas.
Clear Creek Township is a township in Marion County, Kansas, United States.
 As of the 2010 census, the township population was 548, including the city of Lincolnville, and unincorporated communities of Antelope and east side of Pilsen.

Question: What was the population as of the 2010 census of the county in which Pilsen, Kansas is located?
Answer: 12,660