Town Hall Address 301 W Madison St Ottawa, IL 61350 United States- LaSalle County Website https://cityofottawa.org/ Zoning (815) 433-0161 230 301 W Madison St Ottawa, IL 61350 United States Fire District 815-434-3805 301 W Lafayette St Ottawa, IL 61350 United States Town Clerk (815) 433-0161 117 301 W Madison St Ottawa, IL 61350 United States Water 815-434-0025 10 828 East Norris Drive Ottawa, IL 61350 United States Sewer (815) 433-0245 100 Pontiac Lane Ottawa, IL 61350 United States Tax Collector (815) 434-8233 707 E Etna Rd Ottawa, IL 61350 United States Code Enforcement (815) 433-0161 110 301 W Madison St Ottawa, IL 61350 United States Town Hall Hours M-F 8-4:30 County LaSalle