Is Washington D.C. in the Northeast? No, It's in the Mid-Atlantic Region

Washington, D.C. is not part of the Northeast region of the United States. It is located in the Mid-Atlantic region.

The U.S. Census Bureau defines the Northeast region as comprising nine states: Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, Pennsylvania, and New Jersey. The District of Columbia, while geographically close to some Northeastern states, is categorized separately in the Mid-Atlantic division along with New York, Pennsylvania, New Jersey, Delaware, and Maryland.