Indian River County, Florida: History
Prior to 1821, the area of Indian River County was part of the Spanish colony of East Florida. In 1822, this area became part of St. Johns County, and in 1824 it became part of Mosquito County (original name of Orange County).
The Second Seminole War was fought in 1835 and from 1838 to 1839. Fort Vinton was built for this purpose near the intersection of present-day Florida State Road 60 and 122nd Avenue.
In 1844, the county's portion of Mosquito County became part of newly created St. Lucia County. In 1855, St. Lucia County was renamed Brevard County. In 1905, St. Lucie County was formed from the southern portion of Brevard County; in 1925 Indian River County was formed from the northern portion of St. Lucie County. It was named for the Indian River, which runs through the eastern portion of the county. In 2025, Indian River County celebrated its centennial for turning 100 years old.
On November 16 and 17, 2023, extreme rainfall struck northern Indian River County, causing severe flooding. Fourteen inches of rain fell in Fellsmere, and eleven inches of rain fell in Vero Lake Estates.