Kissimmee (/ksmi/k-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. The area was originally named Allendale, after Confederate Major J.H. Allen who operated the first cargo steamboat along the Kissimmee River - the Mary Belle. It was renamed Kissimmee when incorporated as a city in 1883. The name, Kissimmee, came from 'Cacema', a Native American name meaning 'long water'. Its growth can be credited to Hamilton Disston of Philadelphia, who based his four-million acre (8,000km2) drainage operation out of the small town. Disston had contracted with the financially wobbly state of Florida to drain its southern lands, for which he would own half of all he successfully drained. This deal made Disston the largest single landowner in the United States.