| Business | Phone |
| Montgomery Cnty Auditors 451 W 3rd St, Dayton 45422 | (937) 225-4699 |
| Montgomery County Auditor 451 W 3rd, Dayton 45402 | (937) 225-4333 |
| Montgomery County Business Tax 451 W 3rd St, Dayton 45422 | (937) 225-4315 |
| Montgomery County Estate Tax 41 N Perry St, Dayton 45402 | (937) 225-4633 |
| Montgomery County Estate Tax 451 W 3rd St, Dayton 45422 | (937) 225-4325 |
| Montgomery County Treasurer 451 W 3rd St, Dayton 45422 | (937) 225-4010 |