Raleigh-Durham, (KRDU), locally known by its IATA code RDU, is the main airport serving Raleigh, Durham, and the surrounding Research Triangle region of North Carolina. It is located in unincorporated Wake County, but is surrounded by the City of Raleigh to the North and East, and the towns of Cary and Morrisville to the South. The airport covers 5,000 acres (2,000 ha; 20 km2) and has three runways.Raleigh-Durham, (KRDU), locally known by its IATA code RDU, is the main airport serving Raleigh, Durham, and the surrounding Research Triangle region of North Carolina. It is located in unincorporated Wake County, but is surrounded by the City of Raleigh to the North and East, and the towns of Cary and Morrisville to the South. The airport covers 5,000 acres (2,000 ha; 20 km2) and has three runways.