Kissimmee is a city in Osceola County, Floria, United States. As of 2006, the population recorded by the U.S. Census Bureau is 60,894. It is the county seat of Osceola County. Kissimmee is a Principal City of the Orlando-Kissimmee, Florida, Metropolitan Statistical Area, which the census bureau estimated had a 2007 population of 2,032,496.