Haddam
- County:
- Washington County
- County Seat:
- No
- Area (mi²):
- 0.343
- State:
- Kansas
Haddam is a city located in Washington County, Kansas. Haddam has a 2026 population of 108. Haddam is currently declining at a rate of -0.92% annually and its population has decreased by 0% since the most recent census, which recorded a population of 108 in 2020.
The median household income in Haddam is $67,500 with a poverty rate of 2.54%. The median age in Haddam is 28.3 years: 33.5 years for males, and 5.7 years for females. For every 100 females there are 45.7 males.