Martin Field (FAA LID: 7K8) is a privately owned, public use airport located three nautical miles (6 km) southwest of the central business district of South Sioux City, in Dakota County, Nebraska, United States.

[1] Martin Field covers an area of 175 acres (71 ha) at an elevation of 1,100 feet (335 m) above mean sea level.

It has one runway designated 14/32 with an asphalt surface measuring 3,323 by 50 feet (1,013 x 15 m).

[1] For the 12-month period ending June 8, 2011, the airport had 10,550 aircraft operations, an average of 28 per day: 99% general aviation and 1% military.

At that time there were 36 aircraft based at this airport: 97% single-engine and 3% glider.