Orange County
- A county in southern California, abbreviation OC (usually with "the.") County Seat: Santa Ana
- A county in Florida, home to Walt Disney World, Universal Studios Florida, SeaWorld Orlando and several other tourist destinations. County Seat: Orlando
- A county in Indiana. County Seat: Paoli.
- A county in New York. County Seat: Goshen.
- A county in North Carolina. County Seat: Hillsborough.
- A county in Texas. County Seat: Orange.
- A county in Vermont. County Seat: Chelsea.
- A county in Virginia. County Seat: Orange.