| Business | Phone |
| Chautauqua County Court House 1 N Erie St, Mayville 14757 | (716) 753-7111 |
| Chautauqua County Family Court 3 N Erie St, Mayville 14757 | (716) 753-4660 |
| Chautauqua County Judge 1 N Erie St, Mayville 14757 | (716) 753-4347 |
| Chautauqua Family Court 3 N Erie St, Mayville 14757 | (716) 753-4351 |
| County Court Clerk 1 N Erie St, Mayville 14757 | (716) 753-4266 |
| County Court House 1 N Erie St, Mayville 14757 | (716) 753-4000 |