- Mayor, City Clerk, Treasurer, Utility Clerk's Office
- 815-493-2431
- Police Department Non-Emergency
- 815-493-6931
- City Maintenance, Water and Sewer Department
- 815-493-6832
- Fire Department Non-Emergency
- 815-493-2341
- Lanark Public Library
- 815-493-2166
- Lanark City Cemetery
- 815-535-7692
- Zoning Officer
- 815-493-6931