Nevada County Air Park is a county-owned public use airport in Nevada County, California, United States. The airport is located three nautical miles (6 km) east of the central business district of Grass Valley, California. It is also known as Nevada County Airport.Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, this airport is assigned GOO by the FAA but has no designation from the IATA (which assigned GOO to an airport in Goondiwindi, Queensland, Australia).