The Tri-Cities refers to several distinct metropolitan areas in the United States that share this name. The most prominent of these is located in the Pacific Northwest, situated at the confluence of the Columbia and Snake Rivers in the state of Washington. This region is primarily known for its significant role in the aerospace industry and its proximity to the Hanford Site.
Other notable Tri-Cities include a metropolitan area in the Mid-Atlantic region, which encompasses parts of Maryland and Virginia, and an area in the Midwest involving cities in Michigan and Ohio. Because the name applies to multiple geographic locations across the country, specific identification depends on the regional context provided by the traveler.