Question: In what year did Pratt County, Kansas and Pratt, Kansas have the largest population?

Context paragraphs:
Preston, Kansas: Preston is a city in Pratt County, Kansas, United States.  As of the 2010 census, the city population was 158.  Preston was founded in 1887.

Pratt County, Kansas: Pratt County (standard abbreviation: PR) is a county located in the U.S. state of Kansas.  As of the 2010 census, the county population was 9,656.  The largest city and county seat is Pratt.

Pratt Regional Airport: Pratt Regional Airport (IATA: PTT, ICAO: KPTT, FAA LID: PTT) is a public use airport located four nautical miles (7 km) north of the central business district of Pratt, a city in Pratt County, Kansas, United States.  Previously known as Pratt Industrial Airport, it is located on the site of the former Pratt Army Airfield.

K-64 (Kansas highway): K-64 was a 3.574 mi state highway in Pratt County, Kansas.  The highway was a partial bypass of Pratt that ran from U.S. Route 281 (US-281) just south of the city limits to US-54/US-400 east of them.  The route was maintained by the Kansas Department of Transportation until July 2016 when the road was turned over to Pratt County.  K-64 was not part of the National Highway System.  K-64 was designated at around 1932 and paved in 1937.

Cullison, Kansas: Cullison is a city in Pratt County, Kansas, United States.  As of the 2010 census, the city population was 101.

Tornado outbreak sequence of May 22–31, 2008: The tornado outbreak sequence of May 22–31, 2008 was a series of tornado outbreaks affecting the central plains of the United States since May 22 to May 31 of 2008.  It was also one of the largest continuous tornado outbreaks on record.  A total 239 tornadoes were confirmed, with the most intense activity occurring across the Great Plains.  One person was killed when a large wedge tornado struck Windsor, Colorado, and two more deaths were reported in Pratt County, Kansas.  One person was also killed near Hugo, Minnesota on May 25 and nine were killed by an EF5 tornado that destroyed most of Parkersburg, Iowa and a small subdivision of New Hartford, Iowa (located near Waterloo, Iowa).  Another death, caused by lightning related to the storms, took place in central Kansas.

Coats, Kansas: Coats is a city in Pratt County, Kansas, United States.  As of the 2010 census, the city population was 83.

Iuka, Kansas: Iuka is a city in Pratt County, Kansas, United States.  As of the 2010 census, the city population was 163.

Pratt, Kansas: Pratt is a city in and the county seat of Pratt County, Kansas, United States.  As of the 2010 census, the city population was 6,835.  Pratt is home to Pratt Community College.

Sawyer, Kansas: Sawyer is a city in Pratt County, Kansas, United States.  As of the 2010 census, the city population was 124.

Supporting paragraphs: Pratt County, Kansas Pratt, Kansas
Answer: 2010