Pierce County Airport, (ICAO: KPLU, FAA LID: PLU), also known as Thun Field, is a county-owned public-use airport located 5 nautical miles (9.3 km; 5.8 mi) south of the central business district of Puyallup, Washington, a city in Pierce County, Washington, United States.

It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2019–2023, in which it is categorized as a local general aviation facility.

Pierce County Airport covers an area of 200 acres (81 ha) at an elevation of 538 feet (164 m) above mean sea level.

[1] In 2022, the airport had 107,000 aircraft operations, an average of 293 per day: 97% general aviation and 3% air taxi.

In December 2022, there was 205 aircraft based at this airport: 194 single-engine, 9 multi-engine, and 2 helicopter.