Polk County is a county located in the State of Florida. As of the 2010 census, the population was 602,095. Its county seat is Bartow, and its largest city is Lakeland. Polk County comprises the Lakeland-Winter Haven Metropolitan Statistical Area and is part of the greater Tampa Bay Area.
In 2010, the center of population of Florida was located in Polk County, near the city of Lake Wales.
Polk County is home to one public university, one state college, and four private universities. One Fortune 500 company – Publix Super Markets (106 in 2012)—has headquarters in the county.