Emmett is a city in Gem County, Idaho, United States. The population was 6,557 at the 2010 census,up from 5,490 in 2000. It is the county seat and the only city in the county. Emmett is part of the Boise−Nampa, Idaho Metropolitan Statistical Area.HistoryRising some above sea level, Squaw Butte, named by Native Americans who used this area as their winter resort, stands at the north end of the valley. The Payette River was named after Francois Payette, a fur trader from Quebec who was put in charge of old Fort Boise in 1818 and traveled through the area. Permanent settlement began in the early 1860s, after gold discoveries in the Boise Basin brought people over the established stage and pack train routes. Two of these trails joined at the Payette River north of the present river bridge in Emmett.Originally called "Emmettville," it was primarily a post office named after Emmett Cahalan, the son of Tom Cahalan, an early settler of the area. The post office was later moved but retained the name. A few years later the "ville" was dropped and the post office and town became simply Emmett. In 1883 James Wardwell had the town platted, and in 1900 the town was incorporated as Emmett. Later, in March 1902, the Idaho Northern railroad came to the valley.