The Sesquicentennial Farms Program recognizes farms that have been held by descendants of the same family for 150 years or more. To qualify for sesquicentennial Farm status, an agricultural property must have been owned by the same family of lineal or collateral descendants for at least 150 years. A lineal descendant is a person in the direct line of descent, such as a child or a grandchild. A collateral descendent is not a direct descendent, but is otherwise closely related, such as a brother, sister, uncle, aunt, nephew, niece or cousin.

This list comes from the Illinois Department of Agriculture.