Mullan is a city in the northwest United States, located in the Silver Valley mining district of northern Idaho. The population was 692 at the 2010 census, down from 840 in 2000.
In Shoshone County at the east end of the Silver Valley, Mullan is in a sheltered canyon of the Coeur d'Alene Mountains at an elevation of 3,278 feet (1,000 m) above sea level. The entrance to the Lucky Friday mine is several hundred yards east of the city center; the active mine (silver, lead, & zinc) descends more than six thousand feet (1.1 mi; 1.8 km) below the surface.
Interstate 90 runs by the city's south side, and the Montana border at Lookout Pass is six miles (10 km) east at 4,700 feet (1,435 m) above sea level.
Mullan came into existence 137 years ago in 1884 with the discovery of gold at the Gold Hunter Mine, which turned out to be a lead and silver producer. That same year, George Good made a lead-silver strike with the Morning Mine and Mullan came into existence between the two mines. The site was filed in August 1888, after the village had twenty log and fifteen frame houses, a sawmill, and a population of 150. The Northern Pacific Railway arrived in 1889 and the city was incorporated in 1904.
During the Coeur d'Alene labor confrontation of 1899, two hundred miners from Mullan joined the Dynamite Express. In the aftermath of the labor war, many of Mullan's leaders and Populist elected officials including the sheriff were arrested and sent to the Wallace bull pens.
The city was named for West Point graduate John Mullan (1830–1909), who was in charge of selecting a wagon route (commonly called the Mullan Road) between Fort Benton (Montana) and Fort Walla Walla (Washington).