St. Charles County, Missouri

St. Charles County, Missouri
County	St. Charles County
State	Missouri
Founded	1812
Seat	St. Charles
Largest city	O'Fallon
Area total sq mi	593
Area land sq mi	561
Area water sq mi	32
Population as of	2020
Population total	405262
Population density sq mi	auto

St. Charles County, Missouri. Located in the eastern part of the state along the Missouri River, it is a core county of the St. Louis metropolitan area. Established in 1812 from portions of St. Louis County, it served as the first capital of Missouri from 1821 to 1826. Today, it is one of the fastest-growing counties in Missouri and a major economic and residential hub.

History

The area's history is deeply tied to early European exploration and settlement, with Auguste Chouteau founding St. Charles in 1769 as *Les Petites Côtes*. It became a critical jumping-off point for western expansion, notably as the starting point of the Lewis and Clark Expedition in 1804. Following the Louisiana Purchase, it was organized as a county, and its namesake city hosted the first Missouri General Assembly after statehood. The Missouri-Kansas-Texas Railroad later spurred growth, and the 20th century saw transformative development with projects like the Earth City business park and the construction of Interstate 70.

Geography

According to the United States Census Bureau, the county has a total area of 593 square miles, bordered by the Missouri River to the south and the Mississippi River to the east. Major waterways include the Dardenne Creek and Cuivre River. The terrain features riverine lowlands and dissected plains, with significant portions of the Cuivre River State Park located within its borders. It is adjacent to Lincoln County, Warren County, and St. Louis County.

Demographics

As of the 2020 United States census, the population was 405,262, making it the third-most populous county in Missouri. The racial makeup was predominantly non-Hispanic white, with growing African American, Asian, and Hispanic communities. The county has experienced consistent population growth, driven by migration from St. Louis and other regions. Major population centers include O'Fallon, St. Charles, and Wentzville.

Economy

The economy is diverse, with major sectors in advanced manufacturing, healthcare, and corporate services. Key employers include General Motors' Wentzville Assembly Plant, the SSM Health system, and Citi. The National Geospatial-Intelligence Agency is constructing its new NGA Campus West facility in St. Louis near the county line. Retail and commercial hubs are concentrated along the I-70 corridor, in areas like Mid Rivers Mall Drive and the Streets of St. Charles.

Government and politics

St. Charles County operates under a charter with an elected County executive and a County council. It has historically been a stronghold for the Republican Party in statewide and federal elections, favoring candidates like Josh Hawley and Eric Schmitt. At the local level, issues often focus on growth management, transportation, and law enforcement, overseen by the St. Charles County Police Department.

Education

Public education is provided by several school districts, including the Fort Zumwalt School District, Wentzville School District, and St. Charles School District. Institutions of higher education include Lindenwood University in St. Charles and St. Charles Community College. The county is also served by the St. Charles City-County Library District.

Transportation

Major highways include Interstate 70, which runs east-west, and Interstate 64 (U.S. Route 40). Key state routes are Route 94 and Route 370, which includes the Blanchette Memorial Bridge. Public transit is provided by Bi-State Development's MetroLink light rail, with stations in St. Charles, and bus services. The St. Louis Downtown Airport in Cahokia serves general aviation needs.

Category:St. Charles County, Missouri Category:Missouri counties Category:1812 establishments in Missouri Territory