1940 Iowa Senate election

The 1940 Iowa State Senate elections took place as part of the biennial 1940 United States elections. Iowa voters elected state senators in 29 of the state senate's 50 districts. State senators serve four-year terms in the Iowa State Senate.

A statewide map of the 50 state Senate districts in the 1940 elections is provided by the Iowa General Assembly here.

The primary election on June 3, 1940 determined which candidates appeared on the November 5, 1940 general election ballot.

Following the previous election, Republicans had control of the Iowa state Senate with 38 seats to Democrats' 12 seats.

To claim control of the chamber from Republicans, the Democrats needed to net 14 Senate seats.

Republicans maintained control of the Iowa State Senate following the 1940 general election with the balance of power shifting to Republicans holding 45 seats and Democrats having 5 seats (a net gain of 7 seats for Republicans).

Summary of Results

 * Note: The 21 holdover Senators not up for re-election are not listed on this table.

Source:

Detailed Results

 * NOTE: The 21 districts that did not hold elections in 1940 are not listed here.
 * Note: If a district does not list a primary, then that district did not have a competitive primary (i.e., there may have only been one candidate file for that district).