Millcreek is a city in Salt Lake County, Utah, and is part of the Salt Lake City Metropolitan Statistical Area. The population as of the 2020 Census was 63,380. Nestled right at the base of the Wasatch Mountains, Millcreek is something of an outdoor-gear mecca. Not only can you shop for gear in this neighborhood, you can climb at a state of the art gym, hike with your dog and fine dine in the canyon.