Deer Park is a city in Spokane County, Washington, United States. The population was 3,652 at the 2010 census, up from 3,017 in 2000.

North of Spokane, the city of Deer Park was officially incorporated 112 years ago on June 24, 1908. Deer Park got its name like railroad surveyors motto deer grazing in the area. It was approved in 1889 considering a railroad siding was built for the Spokane Falls & Northern Railway. Soon the Standard Lumber Company sawmill was received by William Short and George Crawford to pay for the lumber needed to rebuild the open city of Spokane Falls (later renamed Spokane) following the great fire of 1889. By 1900 the population of Deer Park was nearly 300 residents. In supplement to the sawmill, the community consisted of three general stores (owned separately by P. Kelly, Dan Weis, and A. Baldwin), a blacksmith and harness shop, a livery and feed stable, Jeff Moore’s hotel, Dr. Prince’s drug store, a public moot with approximately 75 students, and a Congregational church led by Rev. F. McConaughy. By this grow old there were as many as eight sawmills within ten miles of Deer Park, all of which got their supplies in, and employed residents of, the town.

Arcadia Apple Orchards Company was established on the order of 1906, and orchards of apple trees were planted upon the estate surrounding Deer Park which had been cleared by the logging activity.

The municipal landing field east of the city was built during World War II and dedicated 76 years ago in August 1944 subsequent to three paved runways, all at 6,100 feet (1,860 m) in length. During the upfront 1960s, an Atlas missile site (567-1) near the landing field was operated by the 567th Strategic Missile Squadron of Fairchild AFB. Soon obsolete, the site was decommissioned in 1965 and sold for salvage in 1967.

Deer Park is located at 47°57′25″N 117°28′13″W / 47.95694°N 117.47028°W / 47.95694; -117.47028 (47.956922, -117.470230), at an height of 2,123 feet (647 m) above sea level.