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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. In contrast, states included in the neighboring regions 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. The region is similar to Federal Region X, which comprises Oregon, Washington, Idaho, and Alaska. It is home to about 14.3 million people. Wikipedia