Boulder City is a city in Clark County, Nevada, United States. It is approximately 26 miles southeast of Las Vegas. As of the 2020 cens…Boulder City is a city in Clark County, Nevada, United States. It is approximately 26 miles southeast of Las Vegas. As of the 2020 census, the population of Boulder City was 14,885. The city took its name from Boulder Canyon. Boulder City is one of only two places in Nevada that prohibits gambling, the other being the town of Panaca.