Also, newly admitted Alabama elected its first representatives in September 1819, increasing the size of the House to 186 seats.

This election occurred in a politically uneventful period marked by exceptionally low levels of partisan rivalry known as the Era of Good Feelings.

One new seat was added for Alabama,[2] while Maine, splitting from Massachusetts, simply retained its Representatives.

The delegation changed from seven Federalists to seven Democratic-Republicans then the retirement of six incumbents and the party-change of the seventh.

New Hampshire elected its members March 9, 1819, after the new congress began but before the first session convened.

At this time, the Democratic-Republicans in New York were divided into two factions, the "Bucktails" who were opposed to Governor Dewitt Clinton's Erie Canal project, led by Martin Van Buren, and on the other side, Clinton's supporters, known as Clintonians.

In many districts, the remaining Federalists allied with the Clintonians, with candidates running on a joint ticket.

North Carolina elected its members August 12, 1819, after the new congress began but before the first session convened.

Virginia elected its members in April 1819, after the new congress began but before the first session convened.