Iowa held a special election on December 30 to fill the vacancy in the State Senate, 16th district. The district is centered in Des Moines.

The results: Democratic 71.5%; Republican 28.5%.

When this district had last voted, in November 2024, the only two candidates had been a Democrat and a Libertarian. In that election, the Democrat got 70.1% and the Libertarian got 29.9%. So, the Republican in the current election got a slightly lower percentage than the Libertarian in the last regular election for this seat.