| Business | Phone |
| Accord Architecture Co 208 E State St, Mason City 50401 | (641) 423-4784 |
| Bergland & Cram Architects 1002 E State St A, Mason City 50401 | (641) 423-6349 |
| Joseph W Chauncey Mason City 50401 | (641) 424-2800 |
| Craig Skott Architects 2800 4th St Sw 6, Mason City 50401 | (641) 424-8689 |
| Spatial Designs Architects 524 Village Green Dr Sw, Mason City 50401 | (641) 423-6395 |
| Waggoner & Wineinger 15 S Federal Ave, Mason City 50401 | (641) 423-4165 |