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Valley County is a rural county located in the state of Idaho. Based on the 2010 census, the
population was 9,862. Valley County was created
on February 26, 1917. The county seat is
Cascade. The county is named for the Long Valley
located in the county.
Established in 1917, it was named after the Long Valley of the North Fork of the Payette River, which extends over 30 miles (50 km) from Payette Lake at McCall south to Cascade to Round Valley. The valley was formerly a summer pasture for livestock from the Boise Valley. Since the completion of the Cascade Dam in 1948, much of the northern valley has been covered by the Cascade Reservoir.
Valley County is named for the area's Long Valley.
County QuickFacts: CensusBureau Quick Facts
Established February 26, 1917 with its county seat at Cascade. Named for the outstanding topographical feature of the area, Long Valley. Fur trappers were the first white men in the area but permanent settlement did not take place until the 1880s when livestock ranchers moved into Long Valley.
As reported by the Census Bureau, the county has a total area of 3,733 square miles (9,670 km2), of which 3,665 square miles (9,490 km2) is land and 68 square miles (180 km2) (1.8%) is water.
Valley county is located close to the center of Idaho. The county is the fifth-largest county in Idaho by area.
Bordering counties are as follows: