In which state is the fictional Bartlet family's home?

The fictional Bartlet family's home is in New Hampshire. President Josiah Bartlet is closely associated with the state throughout The West Wing, where he was born into a prominent New Hampshire family and later served as governor and as a U.S. representative.

New Hampshire is more than a background detail. Bartlet's identity, political career, and family history are repeatedly tied to the state, helping explain his New England manner and his reputation as an academic and statesman. Mrs. Landingham worked for his father at the private school Bartlet attended there, and the President returns to New Hampshire in stories involving his family and political past.

The character is fictional, but the show gives him a deliberate historical connection to the real Josiah Bartlett, a New Hampshire delegate and signer of the Declaration of Independence. That real figure provides the fictional President's name and ancestry. The answer is New Hampshire—not neighboring Maine, Massachusetts, or Vermont—because the Bartlet family story and home base are explicitly placed there.