The Compromise of 1850, though largely crafted in the Senate, was also passed by the House, brokering its admission to the Union.

Anticipating statehood, California elected two members at-large on November 13, 1849, to be seated September 11, 1850.

The small Free Soil Party, opposing expansion of slavery into the Western territories, supported David Wilmot of Pennsylvania, author of the Wilmot Proviso, calling attention to slave power's hold over both major parties.

[3] Elections were held August 6, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

In California two at-large members were elected November 13, 1849 in anticipation of statehood and seated September 11, 1850.

Elections were held April 2, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

Elections were held November 5, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

Elections were held November 5–6, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

Elections were held April 4, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.

Elections were held April 26, 1849, after the March 4, 1849 beginning of the term, but before the House first convened in December 1849.