| Business | Phone |
| Beltone Hearing Aid Ctr 85 Thomas Johnson Dr, Frederick 21702 | (301) 663-3141 |
| Castle Hearing Ctr Inc 801 Toll House Ave # D3, Frederick 21701 | (301) 846-0222 |
| K & K Hearing Assoc 1560 Opossumtown Pike # 21, Frederick 21702 | (301) 682-7777 |
| Miracle-Ear 5500 Buckeystown Pike, Frederick 21703 | (301) 696-9757 |