Kissimmee (/kɨˈsɪmiː/ kə-SIM-ee) is a city in Osceola County, Florida. As of the 2010 United States Census, the population was 59,682. It is the county seat of Osceola County. Kissimmee is a Principal City of the Orlando-Kissimmee-Sanford, Florida, Metropolitan Statistical Area, which had a 2010 population of 2,134,411.