Town Hall Address 340 N. Cash St. Seneca, IL 61360 United States- Grundy, LaSalle County Website http://www.senecail.org/ Zoning 815-712-2791 340 N. Cash St. Seneca, IL 61360 United States Fire District 815-357-1600 121 Armour St. Seneca, IL 61360 United States Town Clerk 815-357-8771 340 N. Cash St. Seneca, IL 61360 United States Water 815-357-8771 340 N. Cash St. Seneca, IL 61360 United States Sewer 815-357-8771 340 N. Cash St. Seneca, IL 61360 United States Tax Collector 815-357-8771 340 N. Cash St. Seneca, IL 61360 United States Code Enforcement 815-712-2791 340 N. Cash St. Seneca, IL 61360 United States Town Hall Hours Monday - Friday: 8:00 A.M. - 4:00 P.M. County Grundy, LaSalle