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 2026 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 45.4 years: 52.4 years for males, and 40.8 years for females. For every 100 females there are 113.6 males.