| Business | Phone |
| Advocates Inc 34 Main St, Ayer 1432 | (978) 772-1846 |
| Ayer Public Access Corp 54 Park St, Ayer 1432 | (978) 772-5858 |
| Systems H2o 11 Willow Rd, Ayer 1432 | (978) 772-7333 |
| Fort Corp 207 W Main St, Ayer 1432 | (978) 772-9646 |
| Garrison Inc 85 Fitchburg Rd, Ayer 1432 | (978) 772-0775 |
| Ground Speed Technology 8 Shaker Rd, Ayer 1432 | (978) 772-3254 |
| Rna Medical 7 Jackson St, Ayer 1432 | (978) 772-9070 |
| Plexus Npi Plus Ne Ayer 1432 | (978) 772-4572 |
| Ox3 Corp 11 Orion Park Dr, Ayer 1432 | (978) 772-1222 |
| O Myungja 210 W Main St, Ayer 1432 | (978) 772-3799 |
| Ktr Performance 99 Fitchburg Rd, Ayer 1432 | (978) 772-9911 |