Senators were elected over a wide range of time throughout 1840 and 1841, and a seat may have been filled months late or remained vacant due to legislative deadlock.

John Leeds Kerr won election to a full term an unknown margin of votes, for the Class 3 seat.

The strength of the parties in the Assembly, as shown by the vote for Speaker, was: 68 for Whig George Washington Patterson and 56 for Democrat Levi S. Chatfield.

Tallmadge re-took his seat on January 27, 1840,[8] and remained in office until June 17, 1844, when he resigned to be appointed Governor of Wisconsin Territory.

Daniel S. Dickinson was appointed to fill the vacancy temporarily, and subsequently elected by the State Legislature to succeed Tallmadge.

McKean's seat was vacated when his term expired in March 1839 and remained vacant until the General Assembly elected a new senator in 1840.

[9] The Pennsylvania General Assembly convened on January 14, 1840, to elect a senator to serve out the remainder of the term that began on March 4, 1839.