what county is san martin in
San Martin Airport. San Martin Airport (formerly South County Airport of Santa Clara County, colloquially South County Airport) (FAA LID: E16) (formerly Q99) is a public non-towered airport located one mile (1.6 km) east of San Martin, serving Santa Clara County, California, U.S.A. This general aviation airport covers 179 acres (72 ha) and has one runway.