Map of Natrona County, Wyoming

Natrona County is a county in the U.S. state of Wyoming. As of the 2020 United States Census, the population was 79,955, making it the second-most populous county in Wyoming. Its county seat is Casper.

Natrona County comprises the Casper, WY Metropolitan Statistical Area.

In 2010, the center of population of Wyoming was in Natrona County, near Alcova.

Natrona County overview:
Name:	Natrona County
FIPS code:	56-025
State:	Wyoming
Named for:	Natron deposits
Seat:	Casper
Largest city:	Casper
Total Area:	5,376 sq mi (13,920 km²)
Land Area:	5,340 sq mi (13,800 km²)
Total Population:	79,955
Population Density:	15/sq mi (5.7/km²)

Natrona County location map. Where is Natrona County?

Natrona County location on the U.S. Map. Where is Natrona County. — Location of Natrona County in the the United States.

Natrona County location on the Wyoming map. Where is Natrona County. — Location of Natrona County in Wyoming.

History

Prior to Wyoming’s settlement by European-based populations, the area’s stretches played host to nomadic tribes such as Cheyenne, Arapaho, Shoshone, and Sioux.

New York investor John Jacob Astor established the settlement of Astoria on the Columbia River, and sent Robert Stuart eastward to blaze a trail and lay the foundation of a string of trading posts. Stuart documented the South Pass Route through the Continental Divide, near the SW corner of present-day Natrona County. Stuart’s company erected the first hut in the area in 1812, near present-day Bessemer Bend.

In 1840, Father Pierre-Jean De Smet began preaching the Christian teaching to this area’s indigenous peoples. He carved his name on Independence Rock and called it The Register of the Desert. Later explorers who inscribed the rock include John C. Frémont (1843), who explored the country along the Platte and Sweetwater Rivers.

The first Euro-American settlement occurred in the Casper area in the late 19th century. Natrona County was created by the legislature of the Wyoming Territory on March 9, 1888, and it was organized in 1890. The land for Natrona County was annexed from Carbon County.

Natrona County was named for the deposits of natron found in the area. According to George Mitchell, first mayor of Casper and member of the organization commission for Natrona County, the name was first suggested “by my old friend the late Cy Iba, who at one time owned the soda lakes.” In 1909, Natrona County gained land from Fremont County. The boundaries were adjusted slightly in 1911 and 1931, and at that point the county gained its present outline.

Natrona County Road Map

Natrona CountyStreet Map. — Street map of Natrona County, Wyoming. Source: OpenStreetMap (OSM)

Geography

According to the U.S. Census Bureau, the county has an area of 5,376 square miles (13,920 km), of which 5,340 square miles (13,800 km) is land and 35 square miles (91 km) (0.7%) is water.