
McMillin
- County:
- Pierce County
- County Seat:
- No
- Area (mi²):
- 1.665
- State:
- Washington
McMillin is a CDP located in Pierce County, Washington. McMillin has a 2025 population of 1,106. McMillin is currently declining at a rate of -2.56% annually and its population has decreased by -10.52% since the most recent census, which recorded a population of 1,236 in 2020.
The average household income in McMillin is $138,538 with a poverty rate of 4.08%. The median age in McMillin is 45.8 years: 49.2 years for males, and 38.5 years for females.