Index
- County:
- Snohomish County
- County Seat:
- No
- Area (mi²):
- 0.23
- State:
- Washington
Index is a town located in Snohomish County, Washington. Index has a 2025 population of 160 . Index is currently growing at a rate of 1.27% annually and its population has increased by 3.9% since the most recent census, which recorded a population of 154 in 2020.
The median age in Index is 48.5 years: 61.6 years for males, and 43 years for females. For every 100 females there are 105.0 males.