where is oldsmar, fl?
Sponsored Topics. Oldsmar is a city in Pinellas County, Florida, United States. The population was 11,910 at the 2000 census. The U.S. Census Bureau estimates the population to be 13,401 as of 2008. Oldsmar's history dates to 1913 when automobile pioneer Ransom E. Olds purchased 37,541 acres (152 kmÂ²) of land by the northern part of Tampa Bay to establish âR. E. Olds-on-the-Bayâ.