Trenton–Mercer Airport is a county-owned, joint civil–military, public airport located four miles northwest of Trenton in the West Trenton section of Ewing Township, Mercer County, New Jersey. Formerly known as Mercer County Airport, the airport serves one scheduled airline plus general and corporate aviation. The U.S. Department of Transportation reports that approximately 301,000 passengers arrived and 300,000 departed at the airport in the 12 months ending July 2023, for a total of 601,000 passengers.