Illinois was part of the French colonial empire, and the city of Cahokia, located near present-day Collinsville, was one of the largest pre-Columbian cities in North America. At its peak, around 1250 CE, Cahokia had a population of around 20,000 people.
Ogle County, Illinois has a rich history that dates back to the early 19th century. The land comprising Ogle County was originally inhabited by Native American tribes, including the Potawatomi, Ho-Chunk, and Miami tribes. European settlement began in the early 1830s, with the arrival of pioneers like Joseph Ogle, after whom the county is named.

Ogle County was officially established on January 16, 1836, and became a hub of agricultural activity. The fertile soil and favorable climate made it a prime location for farming, and early settlers quickly turned the area into an agricultural powerhouse. Corn, wheat, and livestock became major commodities, and the county's wealth grew rapidly.

During the mid-19th century, Ogle County played a significant role in the Underground Railroad. Many residents actively supported the abolition of slavery, offering assistance and safe passage to escaped slaves on their journey to freedom. This courageous network of individuals helped many slaves find safety and eventually settle in the county.

Ogle County also saw industrial development in the late 19th century. With the advent of transportation infrastructure, such as railroads, the county's economy diversified. Manufacturing and mining became important sectors, and the population of the county grew steadily. The arrival of the Chicago and Northwestern Railroad in the 1850s further boosted the region's economy.

Today, Ogle County continues to thrive as an agricultural center and a desirable place to live. Its rich history is evident in its preserved heritage sites, such as the historic Lincoln Highway and the Stronghold Castle. Ogle County remains a testament to the hard work and resilience of its early pioneers, and it continues to be an integral part of Illinois' heritage.

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

  • 1835 - Ogle County is officially established
  • 1836 - First settlers begin moving to the area
  • 1839 - Oregon is chosen as the county seat
  • 1841 - First courthouse is built in Oregon
  • 1851 - The Galena and Chicago Union Railroad reaches the county
  • 1855 - Rochelle is incorporated as a village
  • 1867 - The Chicago & North Western Railway is completed through Rochelle
  • 1876 - The first courthouse in Oregon is destroyed by fire
  • 1877 - Construction of a new courthouse begins
  • 1896 - The present-day courthouse in Oregon is completed
  • 1911 - Illinois Traction System interurban line reaches Rochelle
  • 1929 - Ogle County Historical Society is formed
  • 1937 - The Black Hawk Statue is dedicated in Lowden State Park
  • 1941 - Byron Nuclear Power Plant begins operation
  • 1961 - Rochelle Municipal Airport opens
  • 1971 - Kable Printing Company, now Quad/Graphics, opens in Mt. Morris
  • 1984 - Oregon State Park opens, featuring the 45-acre Lake
  • 1990 - The Ogle County Fair celebrates its 150th anniversary
  • 2005 - The Ogle County Board creates the Ogle County Solid Waste Management Department
  • 2010 - Ogle County celebrates its 175th anniversary