| Business | Phone |
| Advanced Instruments 3353 Beard Rd, Napa 94558 | (707) 257-3889 |
| Marie Foster Hearing Aid Center 3179 Solano Ave, Napa 94558 | (707) 255-6383 |
| Microtone Hearing Aid Center 2800 Jefferson St # 11, Napa 94558 | (707) 257-2955 |
| Napa Valley Hearing Aid Center 1216 Main St, Napa 94559 | (707) 255-2077 |
| Natural Ear Hearing Aid 2180 Jefferson St, Napa 94559 | (707) 265-8127 |