According to the US Census Bureau population estimates, there were 3,161,105 people living in Utah in 2018. Salt Lake County was the most populated county with 1.2M residents. Another highly populated county was Utah County which had 622K residents. Together, Salt Lake County and Utah County residents constituted 56% of all residents of Utah in 2018.
Hover over the counties to see the population of each county. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.