Fairfax township
- County:
- Osage County
- County Seat:
- No
- Area (mi²):
- 43.315
- State:
- Kansas
Fairfax township is located in Osage County, Kansas. Fairfax township has a 2026 population of 624. Fairfax township is currently declining at a rate of -0.16% annually but its population has increased by 1.79% since the most recent census, which recorded a population of 613 in 2020.
The median household income in Fairfax township is $79,844 with a poverty rate of 4.62%. The median age in Fairfax township is 65.6 years: 65.9 years for males, and 65 years for females. For every 100 females there are 136.8 males.