| Business | Phone |
| Brookfield Road Commissioner 2099 E 27th Rd, Seneca 61360 | (815) 357-8927 |
| Manlius Township Supervisor 161 W Douglas St, Seneca 61360 | (815) 357-8813 |
| Miller Township Mntnc Bldg 3338 E 28th Rd, Seneca 61360 | (815) 357-8973 |
| Seneca City Pumping Station 3 615 N Main, Seneca 61360 | (815) 357-1946 |
| Seneca City Waste Water Trtmnt W Union, Seneca 61360 | (815) 357-8406 |
| Seneca Street Maintenance Bldg 315 N Main St, Seneca 61360 | (815) 357-3216 |