A statewide map of the 50 state Senate districts in the 1920 elections is provided by the Iowa General Assembly here.

The primary election on June 7, 1920, determined which candidates appeared on the November 2, 1920 general election ballot.

To claim control of the chamber from Republicans, the Democrats needed to net 21 Senate seats.

Republicans maintained control of the Iowa State Senate following the 1920 general election with the balance of power shifting to Republicans holding 48 seats and Democrats having 2 seats (a net gain of 3 seats for Republicans).

Democrats suffered a disastrous performance as they lost every single district up for election, including three held by them.