It is 4 nmi (7.4 km) east of the central business district of San Marcos, a city that is mostly in Hays County.

The airport is owned by the City of San Marcos and operated by Texas Aviation Partners.

[3] It was the site of the Gary Army Airfield Organized San Marcans fought to save the base, and on November 20, 1964, President Lyndon B. Johnson announced in a speech at his alma mater, Southwest Texas State College[a] that the abandoned Camp Gary would be the site of a new federal vocational training facility called Job Corps.

[5] San Marcos Regional Airport covers an area of 1,303 acres (527 ha) at an elevation of 595 feet (181 m) above mean sea level.

[1] For the 12-month period ending June 5, 2023, the airport had 91,849 aircraft operations, an average of 251 per day: 98% general aviation, 2% military and <1% air taxi.