Senators were elected over a wide range of time throughout 1814 and 1815, and a seat may have been filled months late or remained vacant due to legislative deadlock.

The Democratic-Republican Party lost a seat but still retained their overwhelming Senate majority.

Two seats held by Democratic-Republicans were left unfilled until long after the next Congress began.

Composition after June 1814 special election in New Hampshire.

In these regular elections, the winner was seated on March 4, 1815; ordered by state.