| Business | Phone |
| Finance Department 400 S Eagle St, Naperville 60540 | (630) 420-4115 |
| Naperville Public Utilities 1392 Aurora Ave, Naperville 60540 | (630) 420-6181 |
| Electrical Engineering 1392 Aurora Ave, Naperville 60540 | (630) 420-6185 |
| City Engineer 400 S Eagle St, Naperville 60540 | (630) 420-6096 |
| City Information Line 400 S Eagle St, Naperville 60540 | (630) 420-6700 |
| City Of Aurora 1090 S State Route 59, Naperville 60540 | (630) 420-7215 |
| Civil Engineering 3612 Plainfield Naperville Rd, Naperville 60564 | (630) 420-6120 |
| Naperville City Cable Adm 400 S Eagle St, Naperville 60540 | (630) 420-6707 |
| Commuter Parking 400 S Eagle St, Naperville 60540 | (630) 420-6053 |