According to the US Census Bureau population estimates, there were 3,034,392 people living in Nevada in 2018. Clark County was the most populated county with 2.2M residents. The second highly populated county was Washoe County which had 466K residents. It is interesting to note that residents of Clark County alone constituted 74% of the total population of Nevada in 2018. Together, Clark and Washoe counties consituted 89% of the total population of Nevada in 2018.