Index Map
Index is a town in Snohomish County, Washington, United States. The population was 178 at the 2010 census.
Prior to settlement by westerners, the Skykomish Indians lived in the area between Sultan and Index. They spoke Lushootseed; fishing the Skykomish River was an important part of their economy.
Logging and lumber booms in the latter half of the 19th century led to the growth of minor settlements in the eastern part of what became Snohomish County in 1861. A gold strike in 1889 at nearby Monte Cristo fueled another influx of prospectors and settlers. The town is named for nearby Mount Index.
Nearby cities include Skykomish, Sultan, Monroe, Gold Bar, Startup.