Ohio was the site of a major oil boom in the late 19th century, with oil wells producing millions of barrels of oil per year. The town of Lima, Ohio, became known as the "little giant of the oil industry" because of the large number of oil companies headquartered there.

Carroll County in Ohio has a rich history that dates back to the early 19th century. The area was initially settled by Native American tribes, particularly the Delaware, Wyandot, and Shawnee. However, with the arrival of white settlers, the Native American presence dwindled, and settlers began to establish permanent communities in the region.

The county was officially formed on December 25, 1833, and it was named in honor of Charles Carroll, the last surviving signer of the Declaration of Independence. Early settlers were primarily farmers attracted to the fertile land in the area. The construction of the Ohio and Erie Canal in the 1830s brought further economic development to Carroll County, as it provided a transportation route for goods and increased trade opportunities.

The discovery of coal deposits in the late 19th century led to the growth of mining operations in the county. Many small mining communities sprang up, and the population of Carroll County boomed. Coal mining became the backbone of the local economy, contributing significantly to the county's growth and prosperity.

In the 20th century, Carroll County faced challenges brought on by economic downturns and changing industries. Coal mining declined, and the county had to adapt to new economic opportunities. Today, agriculture, manufacturing, and tourism are vital components of the county's economy. The area's beautiful landscapes, including the picturesque Atwood Lake, attract visitors from near and far, providing an economic boost to the county. Despite the challenges, Carroll County's history is one of resilience and adaptation, with its communities continuing to thrive and progress.

  • 1832 - Carroll County was established on January 1, 1833.
  • 1834 - The county seat was established in Carrollton.
  • 1836 - The first courthouse was built in Carrollton.
  • 1863 - The Battle of Carrollton occurred during the Civil War.
  • 1885 - The iconic Carroll County Courthouse was completed.
  • 1969 - The Atwood Lake project was completed, creating a popular recreational area.
  • 1996 - The historic Elderberry Flats Covered Bridge, built in 1867, was destroyed by arson.
  • 2000 - The construction of the Carroll County Energy Center, a natural gas power plant, began.
  • 2010 - The Carroll County Veterans Memorial Park was established in Carrollton.
  • 2014 - The first Carroll County Fairgrounds multi-purpose building was opened.
  • 2019 - The Carroll County Historical Society Museum relocated to a new building.