Salt Lake County, Utah Utah Territory after traveling what settlers later called Emigration Canyon. Brigham Young, their leader, declared "This is the place" after seeing the valley. Compared to eastern regions, it seemed arid and unpromising to some of the migrants. Settlers used extensive irrigation to develop agriculture and the flourishing, self-sufficient city, known then as Great Salt Lake City. Thousands of Mormons joined them in the next several decades. The county was officially organized on January 31, 1850, with slightly more than 11,000 residents recorded. Mormon settlements were scattered across the valley and beyond. They relocated the territorial capital to Great Salt Lake
Transportation in Salt Lake City County and passes the Salt Lake City International Airport before merging with I-15 west of downtown. The merge continues south for about before I-80 splits east again. It passes through largely residential areas through northern South Salt Lake and the Sugar House neighborhood of Salt Lake City before entering Parley's Canyon, passing through Summit County, and leaving the state on its northeast corner. Interstate 215, known as the "Belt Route", forms a 270° loop around Salt Lake City and its first-ring suburbs. It enters the Rose Park neighborhood in northwestern Salt Lake City from Davis County (where it recently split