2018 Iowa Senate election

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v t e

The 2018 Iowa State Senate elections took place as part of the biennial 2018 United States elections. Iowa voters elected state senators in half of the state senate's districts—the 25 odd-numbered state senate districts. State senators serve four-year terms in the Iowa State Senate, with half of the seats up for election each cycle.

The primary election on June 5, 2018, determined which candidates appeared on the November 6, 2018 general election ballot. Primary election results can be obtained here.

Following the previous 2016 Iowa Senate election, Republicans flipped control of the Iowa State Senate, taking control away from the Democrats.

To reclaim control of the chamber from Republicans, the Democrats needed to net six Senate seats.

Republicans expanded their control of the Iowa State Senate following the 2018 general election, increasing their majority from 29 to 32 seats. Democrats saw their numbers dwindle from 20 to 18 seats. The lone Independent member of the IA state Senate was replaced by a Republican as well.

• NOTE: Only odd-numbered Iowa Senate seats were up for election in 2018, so even-numbered seats are not included here.

Source:

Seats where the margin of victory was under 10%:

1. State Senate district 27, 2%
2. State Senate district 7, 2.6% gain
3. State Senate district 19, 2.8%
4. State Senate district 41, 3.6%
5. State Senate district 47, 5.6%
6. State Senate district 29, 7.2% gain
7. State Senate district 39, 9%
8. State Senate district 49, 9.8% gain

• Reminder: Only odd-numbered Iowa Senate seats were up for election in 2018, so even-numbered seats are not included 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).

Source:

• United States elections, 2018
• United States House of Representatives elections in Iowa, 2018
• Elections in Iowa