Northwestern United States

The Northwestern United States, also known as the American Northwest or simply the Northwest, is an informal geographic region of the United States. The region consistently includes the states of Oregon, Washington, Idaho, Montana and Wyoming. Some sources include Southeast Alaska in the Northwest. The related but distinct term Pacific Northwest generally excludes areas from the Rockies eastward, whereas the term "Inland Northwest" excludes areas west of the Cascades.

The Northwestern United States is a subportion of the Western United States (which is, itself, even more ambiguous). In contrast, states included in the neighboring regions (Southwestern United States and Great Plains) and Utah are not simultaneously considered part of both regions.

Like the southwestern United States, the Northwest definition has moved westward over time. The current area includes the old Oregon Territory (created in 1848–Oregon, Washington, Idaho, and areas in Montana west of the Continental Divide). The region is similar to Federal Region X, which comprises Oregon, Washington, Idaho, and Alaska.

It is home to about 14.3 million people (as of 2016). Some of the fastest growing cities in this region and in the nation include Seattle, Spokane, Bellevue, Tacoma, Kennewick, Pasco, Yakima, Portland, Eugene, Salem, Boise, Idaho Falls, Missoula, Bozeman, and Billings.

Centers of population

As of 2016, the Northwestern states have a cumulative population of 14,297,316, with Oregon and Washington accounting for 77% of the entire five-state region's population. As of 2016, there are 25 metropolitan statistical areas in the Northwest with populations of 100,000 or more, none of which are in Wyoming. Since adjacent metropolitan areas often function as one combined agglomeration, the U.S. Census Bureau additionally defines nine combined statistical areas across the Northwest, eight of which having populations of 100,000 or more.

Rank	Combined or Metropolitan	State(s)	Population
1	Seattle–Tacoma	Washington	4,018,598
2	Portland–Vancouver–Salem	Oregon
Washington	2,510,259
3	Boise–Mountain Home–Ontario	Idaho
Oregon	845,877
4	Spokane–Spokane Valley–Coeur d'Alene	Washington
Idaho	793,285
5	Eugene-Springfield	Oregon	382,986
6	Medford–Grants Pass	Oregon	221,844
7	Kennewick–Pasco–Richland-Walla Walla	Washington	303,501
8	Yakima	Washington	251,879
9	Idaho Falls–Rexburg–Blackfoot	Idaho	155,361
10	Bellingham	Washington	131,016