New Hartford
- County:
- Butler County
- County Seat:
- No
- Area (mi²):
- 0.62
- State:
- Iowa
New Hartford is a city located in Butler County, Iowa. New Hartford has a 2026 population of 555. New Hartford is currently declining at a rate of -0.89% annually and its population has decreased by -2.97% since the most recent census, which recorded a population of 572 in 2020.
The median household income in New Hartford is $84,375 with a poverty rate of 14.12%. The median age in New Hartford is 38.2 years: 29.3 years for males, and 39.3 years for females. For every 100 females there are 123.5 males.