Jefferson County

Historical marker location:
300 Main Street, Hillsboro, Missouri
( Marker is at the intersection of Main Street (State Highway BB) and Locust Street, on the right when traveling east on Main Street.)
Marker installed: 1955

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Missouri was admitted to the Union as the 24th state on August 10, 1821, becoming the first state entirely west of the Mississippi River.
Jefferson County, located in eastern Missouri, has a rich history dating back thousands of years. The area was originally inhabited by the Osage and Illinois Native American tribes. The first European settlers arrived in the late 18th century, including French trappers and traders. In 1808, the county was officially established and named after Thomas Jefferson, the third President of the United States.

During the 19th century, Jefferson County experienced significant growth as farmers and miners settled in the region. The fertile land attracted agricultural settlers who cultivated crops such as corn, wheat, and tobacco. The discovery of lead deposits in the area led to the emergence of lead mining as an important industry. In the mid-1800s, the construction of the Pacific Railroad through Jefferson County further fueled economic development and facilitated transportation.

The Civil War had a profound impact on Jefferson County, as it did on many regions in Missouri. Although the county officially remained loyal to the Union, it experienced both pro-Union and pro-Confederate sentiments. Skirmishes and guerrilla warfare occurred throughout the area, with local farms and towns often caught in the crossfire. The aftermath of the war brought challenges, but Jefferson County slowly recovered, with the mining industry regaining its significance and railroad expansion continuing.

In the 20th century, Jefferson County witnessed further growth and modernization. The population increased, and improvements in infrastructure, such as the construction of highways, facilitated transportation and communication. Changes in agriculture and industry led to shifts in the local economy. Today, Jefferson County is a mix of suburban and rural areas, with a diverse economy that includes manufacturing, services, agriculture, and tourism. The county continues to honor and preserve its historical heritage while embracing progress and development.

This timeline provides a glimpse into the major events and milestones that have shaped the history of Jefferson County, Missouri.

  • 1804: Jefferson County is established as part of the Louisiana Purchase.
  • 1818: The first permanent settlement, Kimmswick, is founded.
  • 1849: Jefferson County becomes an official county in the state of Missouri.
  • 1857: Arnold is incorporated as a city in Jefferson County.
  • 1864: The Battle of Sandy Creek takes place during the American Civil War.
  • 1930: The construction of the Jefferson Barracks Bridge is completed, connecting Jefferson County to St. Louis County.
  • 1940: Big River State Forest is established.
  • 1976: In celebration of the American Bicentennial, Jefferson County hosts a Freedom Fair.
  • 1993: The Jefferson National Expansion Memorial is renamed the Gateway Arch National Park.
  • 2008: The Missouri Bluffs Golf Club becomes a popular destination for golfers in Jefferson County.