Davis County, UT
Established in 1850, Davis County is the third most populous county in Utah - with a population of 351,713 and an area of 634 mi². The county seat is currently located in Farmington. Though the county's growth was slow at first, the installation of the Utah Central Rail Road induced a surge of commerce, agriculture, and infrastructure.
Salt Lake County, UT
Salt Lake County was settled in 1847 by Mormon pioneers fleeing religious persecution, but wasn't officially established until 1852. The county covers an area of 807 mi² and has a population of 1,152,633. The county seat is also the state capital: Salt Lake City. There are many notable ski resorts, and the Great Salt Lake is one of the more famous natural landmarks.
Utah County, UT
Utah County is one of only seven counties in the U.S. that shares it's name with it's state. The county boundaries have been adjusted a total of six times, but it now covers an area of 2,144 mi². The county was established in 1852 and the county seat is currently located in Provo. As the second most populous county in the state, Utah County has a population of 622,213.
Washington County, UT
Fort Harmony, built in 1852, was the earliest settlement in what's now Washington County. The fifth most populous county in the state, Washington County has an estimated population of 171,700 as of 2018. The area experiences an average of 13 inches of rain, 14 inches of snow, and 257 days of sunshine per year. Zion National Park helps to fuel the economy of several smaller towns within Washington County.
Weber County, UT
Weber County covers an area of 659 mi² and is found in north-central Utah. The fourth most populous county in the state, Weber County has an estimated population of 256,359. The county was established in 1852 and the county seat is currently located in Ogen. Weber County is home to Weber Valley, which drew an influx of fur trappers during the early 1800's - helping to encourage the county's early growth.