Question: What is the population of the largest city in Trego County?

Context articles: WaKeeney, Kansas
Great Falls, Montana
Manchester, New Hampshire
Jacksonville, Florida
Oakland, California
Greenville, South Carolina
Elizabeth, New Jersey
Trego County, Kansas
Rome, Georgia
Collyer, Kansas

WaKeeney is a city in and the county seat of Trego County, Kansas, United States.
 As of the 2010 census, the city population was 1,862.
Great Falls is a city in and the county seat of Cascade County, Montana, United States.
 The 2015 census estimate put the population at 59,638.
 The population was 58,505 at the 2010 census.
 It is the principal city of the Great Falls, Montana Metropolitan Statistical Area, which encompasses all of Cascade County and has a population of 82,278.
 Great Falls was the largest city in Montana from 1950 to 1970, when Billings surpassed it.
 Great Falls remained the second largest city in Montana until 2000, when it was passed by Missoula.
 Since then Great Falls has been the third largest city in the state.
Manchester is the largest city in the U.S. state of New Hampshire, the eleventh largest city in New England, and as of 2016 the largest city in northern New England, an area comprising the states of Maine, New Hampshire, and Vermont.
 As of the 2010 census, the city had a population of 109,565, and its estimated 2016 population was 110,506.
 It is located in Hillsborough County along the banks of the Merrimack River, which divides the city into eastern and western sections.
 Manchester is near the northern end of the Northeast megalopolis.
 It was first named by the merchant and inventor Samuel Blodget (after whom Samuel Blodget Park and Blodget Street in Manchester's North End are named).
 Blodget's vision was to create a great industrial center similar to that of the original Manchester in England, which was the world's first industrialized city.
Jacksonville is the largest city by population in the U.S. state of Florida, and the largest city by area in the contiguous United States.
 It is the county seat of Duval County, with which the city government consolidated in 1968.
 Consolidation gave Jacksonville its great size and placed most of its metropolitan population within the city limits; with an estimated population of 913,010 as of 2017, Jacksonville is the most populous city in the state of Florida and the southeastern United States.
 The Jacksonville metropolitan area has a population of 1,626,611.
 It is the 34th largest MSA in the United States and fourth largest in Florida.
Oakland is the largest city and the county seat of Alameda County, California, United States.
 A major West Coast port city, Oakland is the largest city in the East Bay region of the San Francisco Bay Area, the third largest city overall in the San Francisco Bay Area, the eighth largest city in California, and the 45th largest city in the United States, with a population of 419,267 as of 2015 .
 It serves as a trade center for the San Francisco Bay Area; its Port of Oakland is the busiest port in the San Francisco Bay, the entirety of Northern California, and the fifth busiest in the United States of America.
 The city was incorporated in 1852.
Greenville ( ; locally ) is the largest city and the county seat of Greenville County in the Upstate region of South Carolina, in the United States.
 The city's mayor is Knox White, who has served in that position since December 1995.
 With an estimated population of 67,453 as of 2016, it is the sixth-largest city in the state.
 The population of the surrounding area was 400,492 as of 2010, making it the third-largest urban area in South Carolina as well as the fastest growing.
 Greenville is the largest city in the Greenville-Anderson-Mauldin Metropolitan Statistical Area.
 The MSA had a population of 884,975 in 2016, making it the largest in South Carolina and the third largest in The Carolinas.
Elizabeth is both the largest city and the county seat of Union County, in New Jersey, United States.
 As of the 2010 United States Census, the city had a total population of 124,969, retaining its ranking as New Jersey's fourth largest city (by population).
 The population increased by 4,401 (3.7%) from the 120,568 counted in the 2000 Census, which had in turn increased by 10,566 (+9.6%) from the 110,002 counted in the 1990 Census.
 For 2015, the Census Bureau's Population Estimates Program calculated a population of 129,007, an increase of 3.2% from the 2010 enumeration, ranking the city the 210th largest in the nation.
Trego County (standard abbreviation: TR) is a county located in the U.S. state of Kansas.
 As of the 2010 census, the county population was 3,001.
 Its county seat and largest city is WaKeeney.
Rome is the largest city in and the county seat of Floyd County, Georgia, United States.
 Located in the foothills of the Appalachian Mountains, it is the principal city of the Rome, Georgia, Metropolitan Statistical Area, which encompasses all of Floyd County.
 At the 2010 census, the city had a population of 36,303.
 It is the largest city in Northwest Georgia and the 19th largest city in the state.
Collyer is a city in Trego County, Kansas, United States.
 As of the 2010 census, the city population was 109.