
Union Gap
- County:
- Kittitas County
- County Seat:
- No
- Area (mi²):
- 5.577
- State:
- Washington
Union Gap is a city located in Kittitas County, Washington. Union Gap has a 2025 population of 6,365. Union Gap is currently declining at a rate of -0.58% annually and its population has decreased by -2.81% since the most recent census, which recorded a population of 6,549 in 2020.
The average household income in Union Gap is $70,253 with a poverty rate of 12.8%. The median age in Union Gap is 32.7 years: 33 years for males, and 31.8 years for females.