| Business | Phone |
| Legislature Chairman 3 N Erie St # 325, Mayville 14757 | (716) 753-4215 |
| Motor Vehicle & License Bureau 3 N Erie St # Gob, Mayville 14757 | (716) 753-4229 |
| N Chautauqua Sewer District 1 Clark St, Mayville 14757 | (716) 753-7787 |
| Chautauqua Cnty Fire Invstgtn 15 E Chautauqua St, Mayville 14757 | (716) 753-4910 |
| Chautauqua Cnty Health-Fiscal 7 N Erie St # 4, Mayville 14757 | (716) 753-4431 |
| Chautauqua Cnty Human Resource 3 N Erie St # 144, Mayville 14757 | (716) 753-4237 |
| Chautauqua Cnty Surrogate Jdg 3 N Erie St, Mayville 14757 | (716) 753-4337 |
| Chautauqua County Bldg & Grnd 3 N Erie St # 126, Mayville 14757 | (716) 753-4391 |
| Chautauqua County Board-Elctns 3 N Erie St, Mayville 14757 | (716) 753-4250 |
| Chautauqua County Central Svc 3 N Erie St # 126, Mayville 14757 | (716) 753-4283 |
| Chautauqua County Civil Dfns 3 N Erie St, Mayville 14757 | (716) 753-4341 |
| Chautauqua County Commissioner 3 N Erie St, Mayville 14757 | (716) 753-4226 |
| Chautauqua County Employee Mayville 14757 | (716) 753-4432 |
| Chautauqua County Info Svc 3 N Erie St, Mayville 14757 | (716) 753-4281 |
| Chautauqua County Information 7 N Erie St, Mayville 14757 | (716) 753-4000 |
| Chautauqua County Insurance 3 N Erie St # 143, Mayville 14757 | (716) 753-4292 |
| Chautauqua County Law Dept 3 N Erie St # 340, Mayville 14757 | (716) 753-4247 |
| Chautauqua County Mental Hlth 7 N Erie St, Mayville 14757 | (716) 753-4319 |
| Chautauqua County Mental Hygn 7 N Erie St, Mayville 14757 | (716) 753-4150 |
| Chautauqua County Microfilm Mayville 14757 | (716) 753-4813 |
| Chautauqua County Pistol Prmt 15 E Chautauqua St, Mayville 14757 | (716) 753-4374 |
| Chautauqua County Planning 7 N Erie St # B02, Mayville 14757 | (716) 753-4296 |
| Chautauqua County Pub Defender 7 N Erie St, Mayville 14757 | (716) 753-4376 |
| Chautauqua County Records 1 N Erie St, Mayville 14757 | (716) 753-4331 |
| Chautauqua County Youth Bureau 3 N Erie St, Mayville 14757 | (716) 753-4496 |
| Chautauqua Fire Coordinator 3 N Erie St, Mayville 14757 | (716) 753-4343 |
| Chautauqua Medical Rehab 7 N Erie St, Mayville 14757 | (716) 753-4262 |
| Chautauqua Technical Svc 10 Blanchard St, Mayville 14757 | (716) 753-4616 |
| Civil Division 15 E Chautauqua St, Mayville 14757 | (716) 661-7371 |
| County Executive 3 N Erie St # 341, Mayville 14757 | (716) 753-4211 |
| County Weights & Measures Dept 1 N Erie St # 133, Mayville 14757 | (716) 753-4228 |
| Health Educator 7 N Erie St, Mayville 14757 | (716) 753-4491 |