
Martha Lake
- County:
- Snohomish County
- County Seat:
- No
- Area (mi²):
- 4.553
- State:
- Washington
Martha Lake is a CDP located in Snohomish County, Washington. Martha Lake has a 2025 population of 25,205. Martha Lake is currently growing at a rate of 2.64% annually and its population has increased by 14.64% since the most recent census, which recorded a population of 21,987 in 2020.
The average household income in Martha Lake is $148,609 with a poverty rate of 10.04%. The median age in Martha Lake is 33.9 years: 34.9 years for males, and 33.1 years for females.