Thayer
- County:
- Union County
- County Seat:
- No
- Area (mi²):
- 0.143
- State:
- Iowa
Thayer is a city located in Union County, Iowa. Thayer has a 2026 population of 48. Thayer is currently declining at a rate of 0% annually and its population has decreased by -2.04% since the most recent census, which recorded a population of 49 in 2020.
The median household income in Thayer is $55,000 with a poverty rate of 4.44%. The median age in Thayer is 29.5 years: 43.5 years for males, and 15.5 years for females. For every 100 females there are 114.3 males.