Township Address: Seneca Township 16506 Garden Valley Road Woodstock, IL 60098 Township Phone #: 815/923-2288 Supervisor Ersel C. Schuster supervisor@senecatownship.com 815-338-2207 Road Commissioner Robert L. Helfers 815-923-2288 Assessor Donald R. Andrews 815-923-5922 Clerk Dawn M. Seemann 815-923-2457 Trustee Rosemary H. Bartman 815-568-8282 Trustee Susan Mathews 815-568-1419 Trustee Michael L. O'Leary 815-338-8616 Trustee Thomas H. Dahlfors 815-337-4105 Planning Commission Chairman Susan Standish 815-568-6385