Mattawa is an incorporated city in Grant County, Washington, United States. The population was 3,335 at the 2020 census.
History
thumb|Exterior view of [[Straw-bale construction|straw bale library in Mattawa, Washington taken in 2008 (constructed 2002 by IronStraw Group).]]
The town of Mattawa was originally platted in 1909 by E. and Eva Campbell, but was not incorporated at that time. With the construction of nearby Priest Rapids Dam and Wanapum Dam, the town boomed with construction workers. Mattawa was officially incorporated on June 3, 1958. The Port of Mattawa was also established in 1958. Mattawa is also home to the first straw bale library in the United States. On December 3, 2009, the City of Mattawa became a non-charter code city.
Geography
According to the United States Census Bureau, the town has a total area of , all of it land.
Climate
According to the Köppen Climate Classification system, Mattawa has a semi-arid climate, abbreviated "BSk" on climate maps.