Article: The United States Census Bureau estimates that the population of Florida was 20,271,272 on July 1, 2015, a 7.82% increase since the 2010 United States Census. The population of Florida in the 2010 census was 18,801,310. Florida was the seventh fastest-growing state in the U.S. in the 12-month period ending July 1, 2012. In 2010, the center of population of Florida was located between Fort Meade and Frostproof. The center of population has moved less than 5 miles (8 km) to the east and approximately 1 mile (1.6 km) to the north between 1980 and 2010 and has been located in Polk County since the 1960 census. The population exceeded 19.7 million by December 2014, surpassing the population of the state of New York for the first time.

Now answer this question: What is the center of the Florida population
Polk County since the 1960 census