Ogle County was formed in 1836 from a part of Ogle County.

There are three state parks and one state forest in Ogle County.

Camp McCormick Girl Scout camp and Lowden Boy Scout camp are located in Ogle County.

There are many historic sites in the county, including the John Deere museum in Grand Detour, historic museums in Byron, Rochelle and Oregon. Rochelle is home to a popular railroad park.

Major industries in the county include agriculture, printing, food distribution and processing, implement manufacturing, recreation and tourism. ComEd’s Byron nuclear power plant is located south of Byron.

Ogle County is the seventeenth (17th) largest county in Illinois, comprising twenty-four (24) townships totaling 757 square miles or 499,320 acres.