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Town of Cortland

Public Services / Government Office

59 S Somonauk Rd,
Cortland, IL 60112

(815) 756-9041

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Cortland is an incorporated town in DeKalb County, Illinois, United States. The population was 4,270 at the 2010 census, up from 2,066 in 2000. Because of its status as an incorporated town, Cortland has adopted the slogan, "The Third Largest Town in Illinois".