List of members of the United States House of Representatives in the 110th Congress by seniority

This is a complete list of members of the United States House of Representatives during the 110th United States Congress (January 3, 2007 – January 3, 2009) listed by seniority.

Seniority depends on the date in which members were sworn into office. Since many members are sworn in on the same day, subsequent ranking is based on previous congressional service of the individual and then by alphabetical order by the last name of the representative.

Committee chairmanship in the House is often associated with seniority. However, party leadership is typically not associated with seniority.

Note: The "*" indicates that the representative/delegate may have served one or more non-consecutive terms while in the House of Representatives of the United States Congress.