A statewide map of the 50 state Senate districts in the 1928 elections is provided by the Iowa General Assembly here.

The primary election on June 4, 1928, determined which candidates appeared on the November 6, 1928 general election ballot.

A special election in district 20 in 1927 saw the seat flip from Republican to Democratic control.

To claim control of the chamber from Republicans, the Democrats needed to net 24 Senate seats.

Republicans maintained control of the Iowa State Senate following the 1928 general election with the balance of power remaining unchanged with Republicans holding 48 seats and Democrats having 2 seats.