Odessa is a census-designated place (CDP) in Pasco County, Florida, United States. The population was 3,173 at the 2000 census and more than doubled to 7,267 in the 2010 census. Northwest of Tampa, Odessa had been an area of open spaces, ranching, and horse properties. More recently it has seen many suburban property developments as Tampa's population expands. Odessa was founded in the 1880s by Peter Demens a Russian immigrant who established the community through the Orange Belt Railway. Demens also founded St. Petersburg, Florida and named both communities after places he used to go to in his native country.