| Business | Phone |
| Chiang Patel & Yerby 901 N Mcdonald St 700, Mckinney 75069 | (972) 542-7315 |
| Criterium Dotson Engineers 210 N Tennessee St E, Mckinney 75069 | (972) 412-7988 |
| Freese & Nichols 105 S Tennessee St, Mckinney 75069 | (972) 548-2400 |
| Lingle Engineers 7001 Westchester Ct 200, Mckinney 75070 | (972) 458-1130 |
| Pogue Engineering & Dev 2111 Eldorado Pkwy, Mckinney 75070 | (214) 544-8883 |
| Psi Laboratories 901 N Mcdonald St 900, Mckinney 75069 | (972) 542-1447 |
| Trinity Engineering Klnfldr 2035 Central Cir, Mckinney 75069 | (972) 542-4362 |
| Sellmeyer Engineering 4695 W University Dr, Mckinney 75071 | (972) 542-2056 |
| Spectrum Semiconductor Techs 404 Mckinney Pkwy C, Mckinney 75071 | (972) 562-2552 |
| Pogue Engineering & Dev 1515 Heritage Dr # 105, Mckinney 75069 | (214) 544-8883 |