Eustis is a city in Lake County, Florida, United States. The population was 15,106 at the 2000 census. The Census Bureau estimated the population in 2008 to be 19,129. It is part of the Orlando–Kissimmee Metropolitan Statistical Area.
Eustis is located at 28°51′04″N 81°40′55″W / 28.850993°N 81.681943°W / 28.850993; -81.681943.
According to the United States Census Bureau, the city has a total area of 9.6 square miles (25.0 km²). 8.4 square miles (21.6 km²) of it is land and 1.3 square miles (3.3 km²) of it (13.28%) is water.