Estimated Population in 2012: 287,416
1,506.35 Square Miles
Median Income per Household: $39,214
County Seat: Kissimmee, FL
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Osceola County was created in 1887. It was named for the Indian leader Osceola, whose name means “Black Drink Cry [Asi Yaholo].”
On July 21, 1821, Florida was divided into two counties, named Escambia County to the west and St. John’s County to the east. In 1824, the southern part of St. John’s County became Mosquito County, with Enterprise as the county seat. When Florida became a state in 1845, Mosquito County was renamed Orange County. In 1844, Brevard County was carved out from Mosquito County. On May 12, 1887, Osceola was named a county, having been created from both Orange and Brevard Counties. Osceola County reached all the way down to Lake Okeechobee until 1917 when Okeechobee County was formed.
Since the late 20th century, Osceola County has experienced a significant influx of immigrants from Puerto Rico, and in the 2000 U.S. Census Puerto Rican was the largest self-reported ancestry group.