Snohomish County is a county located in the U.S. state

U.S. state

A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...

 of Washington. It is named after the Snohomish

Snohomish (tribe)

The Snohomish are a Lushootseed Native American tribe who reside around the Puget Sound area of Washington, north of Seattle. They speak the Lushootseed language. The tribal spelling is Sdoh-doh-hohbsh, which means "wet snow" according to the last chief of the Snohomish tribe, Chief William...

 tribe. Since 2000, the county's population has grown from 606,024 to 713,335 residents (2010), making it one of the fastest-growing in the state, ranking third in overall population after King

King County, Washington

King County is a county located in the U.S. state of Washington. The population in the 2010 census was 1,931,249. King is the most populous county in Washington, and the 14th most populous in the United States....

 (1,931,249) and Pierce

Pierce County, Washington

right|thumb|[[Tacoma, Washington|Tacoma]] - Seat of Pierce CountyPierce County is the second most populous county in the U.S. state of Washington. Formed out of Thurston County on December 22, 1852, by the legislature of Oregon Territory...

 (795,225) counties (per 2010 Census figures). The county seat is Everett

Everett, Washington

Everett is the county seat of and the largest city in Snohomish County, Washington, United States. Named for Everett Colby, son of founder Charles L. Colby, it lies north of Seattle. The city had a total population of 103,019 at the 2010 census, making it the 6th largest in the state and...

, the county's largest city in population.

Snohomish County was created out of Island County

Island County, Washington

Island County is a county located in the U.S. state of Washington. In 2010 census, its population was 78,506. Its county seat is Coupeville, while its largest city is Oak Harbor....

 on January 14, 1861.
According to the U.S. Census Bureau

United States Census Bureau

The United States Census Bureau is the government agency that is responsible for the United States Census. It also gathers other national demographic and economic data...

, the county has a total area of 2196 square miles (5,687.6 km²), of which 2089 square miles (5,410.5 km²) is land and 107 square miles (277.1 km²) (4.89%) is water.