| Business | Phone |
| American Cash Registers Ontario 91762 | (909) 988-6961 |
| Apple Store 12242 S Main St, Ontario 91764 | (909) 945-5395 |
| Cadmus Micro Inc 1840 S Carlos Ave, Ontario 91761 | (909) 947-5813 |
| Compaq Computer 1220 S Baker Ave, Ontario 91761 | (909) 930-8000 |
| Computer Annex Corp 520 S Mountain Ave, Ontario 91762 | (909) 933-3577 |
| Data 911 Ontario 91764 | (909) 980-4413 |
| Direct Ups 2141 E Philadelphia St # A, Ontario 91761 | (909) 673-9853 |
| High Touch Imaging Technology 285 S Dupont Ave, Ontario 91761 | (909) 974-0099 |
| Hp 1220 S Baker Ave, Ontario 91761 | (909) 930-0461 |
| J C Computers Sales & Ntwrkng 4045 E Guasti Rd, Ontario 91761 | (909) 605-8848 |
| Kingstar Technologies 1235 E Francis St # H, Ontario 91761 | (909) 673-0304 |
| Mbo Enterprise 1456 E Philadelphia St # 40, Ontario 91761 | (909) 930-1314 |
| R & C Computers 2780 E Riverside Dr, Ontario 91761 | (909) 947-3959 |
| Sigmanet 4290 E Brickell St, Ontario 91761 | (909) 390-0738 |
| T A Enterprises 540 Doral St, Ontario 91761 | (909) 262-6969 |
| Toyo Plastics 801 S Dupont Ave # A, Ontario 91761 | (909) 974-0280 |