| Business | Phone |
| Water Works 260 E Washington St, Frankfort 46041 | (765) 654-5556 |
| Frankfort Municipal Utilities 16 N Main St # 1, Frankfort 46041 | (765) 659-3361 |
| Frankfort Utility Auditor 16 N Main St # 2, Frankfort 46041 | (765) 659-3725 |
| Frankfort Wastewater Treatment 45 W County Road 100 N, Frankfort 46041 | (765) 659-4741 |