| Business | Phone |
| Mason City Admn 10 1st St Nw, Mason City 50401 | (641) 421-2701 |
| Mason City Campgrounds 901 Birch Dr, Mason City 50401 | (641) 421-3679 |
| Mason City Engineering 10 1st St Nw, Mason City 50401 | (641) 421-3605 |
| Mason City Human Rights Dir 10 1st St Nw, Mason City 50401 | (641) 421-3618 |
| Mason City Inspection Office 10 1st St Nw, Mason City 50401 | (641) 421-3620 |
| Mason City Payroll & Acctg 10 1st St Nw, Mason City 50401 | (641) 421-3614 |
| Mason City Waste Water Plant 2950 Birch Dr, Mason City 50401 | (641) 421-3682 |
| Mason City Youth Taskforce 10 1st St Nw, Mason City 50401 | (641) 421-2708 |