| Business | Phone |
| Record Room 1501 Main St 121, Princeton 24740 | (304) 487-8313 |
| Circuit Clerk's Office-Jury 1501 Main St, Princeton 24740 | (304) 487-8367 |
| Civil Division-Circuit Clerk 1501 Main St 111, Princeton 24740 | (304) 487-8323 |
| County Accounting 1501 Main St, Princeton 24740 | (304) 487-8378 |
| Mercer County Assessor 1501 Main St 2, Princeton 24740 | (304) 487-8332 |
| County Commission's Office 1501 Main St, Princeton 24740 | (304) 487-8306 |
| County Maintenance 1501 Main St, Princeton 24740 | (304) 487-8325 |
| County Payroll Clerk's Ofc 1501 Main St, Princeton 24740 | (304) 487-8330 |
| Honorable Danny Fulknier 1605 N Walker St, Princeton 24740 | (304) 425-7799 |
| Honorable David Knight 1501 W Main St, Princeton 24740 | (304) 487-8346 |
| Magistrate Office 120 Scott St, Princeton 24740 | (304) 425-7259 |
| Honorable John Frazier 1501 Main St, Princeton 24740 | (304) 487-8347 |
| Honorable Mike Flanagan 1605 N Walker St, Princeton 24740 | (304) 425-7328 |
| Honorable Roy Compton 1428 E Main St, Princeton 24740 | (304) 425-7799 |
| Honorable Roy Compton 701 Mercer St, Princeton 24740 | (304) 425-7799 |
| Memorial Building 1500 W Main St, Princeton 24740 | (304) 487-8328 |
| Mercer County Bus Garage 1403 Honaker Ave, Princeton 24740 | (304) 425-4583 |
| Mercer County Commission 1501 Main St 210, Princeton 24740 | (304) 487-8310 |
| Mercer County Consumer Svc 325 Mercer St, Princeton 24740 | (304) 487-6764 |
| Mercer County Consumer Svc Old Gardener Rd, Princeton 24740 | (304) 487-6764 |
| Mercer County Development Auth 1500 W Main St, Princeton 24740 | (304) 487-2896 |
| Mercer County Family Law 130 Scott St, Princeton 24740 | (304) 425-0537 |
| Mercer County Probate Wills 1501 Main St 121, Princeton 24740 | (304) 487-8312 |
| Mercer County Jury Information Princeton 24740 | (304) 487-8393 |
| Mercer County Mls 514 Quail Valley Dr, Princeton 24740 | (304) 425-9240 |
| Mercer County Office Main St, Princeton 24740 | (304) 487-8785 |
| Mercer County Real Estate Tsf 1501 Main St, Princeton 24740 | (304) 487-8315 |
| Mercer County Reappraisal Ofc 1422 E Main St, Princeton 24740 | (304) 425-7358 |
| Mercer County Rl Est Transfer 1501 Main St, Princeton 24740 | (304) 487-8320 |
| Mercer County Warehouse 340 Mercer St, Princeton 24740 | (304) 487-3032 |
| Personal Property & Vehicle 1501 Main St, Princeton 24740 | (304) 487-8377 |
| University Extension Office 1500 W Main St, Princeton 24740 | (304) 425-3079 |
| Vehicle License 1501 Main St, Princeton 24740 | (304) 487-8363 |
| Voter's Registration 1501 Main St, Princeton 24740 | (304) 487-8339 |