Oldsmar is a city in Pinellas County, Florida, United States. The population was 11,910 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 13,706. Oldsmar apartments for rent comparison page shows most up to date rent information on Oldsmar apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.