Hartford
- County:
- Lyon County
- County Seat:
- No
- Area (mi²):
- 0.396
- State:
- Kansas
Hartford is a city located in Lyon County, Kansas. Hartford has a 2026 population of 364. Hartford is currently growing at a rate of 0.55% annually and its population has increased by 2.54% since the most recent census, which recorded a population of 355 in 2020.