Delmar
- County:
- Clinton County
- County Seat:
- No
- Area (mi²):
- 0.764
- State:
- Iowa
Delmar is a city located in Clinton County, Iowa. Delmar has a 2026 population of 541. Delmar is currently declining at a rate of -0.55% annually and its population has decreased by -0.55% since the most recent census, which recorded a population of 544 in 2020.