The average annual rainfall is 52.35 inches. History Orange County was established in 1824 from a portion of St. Johns County. Originally named Mosquito, the county was renamed Orange in 1845 for the many orange groves in the area. The greatest population concentration in Orange County is in the Orlando area. Within the corporate boundaries of Orlando were 172,019 persons in 1993.
Development continues in nearby unincorporated areas.
Since 1980 a new area of rapid growth has been Orangewood. The 1992 birth rate was 16.4 live births per 1,000 persons, and the 1992 death rate was 7.0 deaths per 1,000 persons. In 1992 the infant mortality rate was 8.1 per 1,000. The leading causes of death in 1993 were heart disease, cancer, and stroke. Colleges and universities.