Washington /ˈwɒʃɪŋtən/ is a state in the Pacific Northwest region of the United States located north of Oregon, west of Idaho, and south of the Canadian province of British Columbia on the coast of the Pacific Ocean.ashington is part of a region known as the Pacific Northwest, a term which always includes Washington and Oregon and may or may not include Idaho, western Montana, northern California, and Alaska, depending on the user's intent.