| Business | Phone |
| A & C Electrical 3619 Honey Glen Way, Ontario 91761 | (909) 947-7898 |
| A C Power Systems 1417 S Granite Ave # M, Ontario 91762 | (909) 983-7158 |
| A-1 Electrical 1827 E Hawthorne St, Ontario 91764 | (909) 988-8992 |
| Aztec Electric Ontario 91762 | (909) 391-8511 |
| Belanger Electrical Svc 1520 W Locust St, Ontario 91762 | (909) 983-4528 |
| Bowman Electric & Assoc 4953 E State St, Ontario 91762 | (909) 465-1917 |
| Citywide Electric Ontario 91762 | (909) 460-9929 |
| County Electric Ontario 91762 | (909) 391-0013 |
| Creative Electric & Theater 151 S Wineville Ave, Ontario 91761 | (909) 974-0035 |
| Datatell Electrical 4035 E Guasti Rd # 310, Ontario 91761 | (909) 605-6183 |
| Electrical Systems Startup 2141 E Philadelphia St # S, Ontario 91761 | (909) 673-1912 |
| Golden State Electric 2021 S Archibald Ave, Ontario 91761 | (909) 947-0353 |
| Gregg Electric Inc 608 W Emporia St, Ontario 91762 | (909) 983-1794 |
| Handyman Connection 2171 S Grove Ave, Ontario 91761 | (909) 974-2804 |
| High Voltage Systems 202 E State St, Ontario 91761 | (909) 984-4281 |
| Hit Electrical Svc 1005 N Center Ave, Ontario 91764 | (909) 917-1326 |
| Jaime Electric 927 N Jasmine Ave, Ontario 91762 | (909) 395-0344 |
| Jml Electric 11190 Vernon Ave, Ontario 91762 | (909) 627-9186 |
| Jonny Socket Electrical Svc 1514 S Carlos Ave, Ontario 91761 | (909) 930-0664 |
| Key Electric Ontario 91761 | (909) 947-5059 |
| L V Electric Inc 1457 E Philadelphia St # 13, Ontario 91761 | (909) 923-1443 |
| Matt Gardner Construction Inc 901 S Sultana Ave, Ontario 91761 | (909) 984-1714 |
| Nichols Electric 2419 S Driftwood Pl, Ontario 91761 | (909) 947-7328 |
| A C Power Systems 1445 Brooks St # M, Ontario 91762 | (909) 983-7158 |
| Blue Point Electric 4355 E Airport Dr, Ontario 91761 | (909) 974-1177 |
| Criscione Electric 3100 E Cedar St, Ontario 91761 | (909) 923-4160 |
| G T Eelctric 2081 S Hellman Ave # D, Ontario 91761 | (909) 923-5745 |
| M G Electrical Corp 2182 Maple Privado, Ontario 91761 | (909) 947-2255 |
| P & C Electric Ontario 91764 | (909) 981-7003 |
| Pals Electric Inc 931 W 6th St, Ontario 91762 | (909) 986-6312 |
| Power Source Ontario 91762 | (909) 984-4118 |
| Priorities 3100 E Cedar St, Ontario 91761 | (909) 923-2390 |
| R L Schafer Co 1910 S Archibald Ave # Q, Ontario 91761 | (909) 947-7220 |
| Rancho Pacific Electric Inc 201 W State St, Ontario 91762 | (909) 391-2447 |
| Right On Electric 2603 S Cherry Ave, Ontario 91761 | (909) 391-0328 |
| Sievenpiper Electric 754 E Princeton St, Ontario 91764 | (909) 984-3132 |
| Somerset Electric 1834 S Helen Ave, Ontario 91762 | (909) 460-6230 |
| Stage's Electric 11217 Bolton Ave, Ontario 91762 | (909) 628-0061 |
| Synergy Electric Ontario 91762 | (909) 983-2107 |
| Tng Electric 2132 S Grove Ave, Ontario 91761 | (909) 930-5517 |
| Val Electric 1261 E Francis St, Ontario 91761 | (909) 923-0070 |
| Vick Electric 206 E Cherry Hill Ct, Ontario 91761 | (909) 983-5826 |
| Walker Electric 1458 S Bon View Ave, Ontario 91761 | (909) 923-5490 |
| Wesco Industrial Electric Co 1635 E Cedar St, Ontario 91761 | (909) 376-8121 |