| Business | Phone |
| Air Choice Spokane 99212 | (509) 928-8777 |
| Cayambe Engineering Ps 9 S Washington St 619, Spokane 99201 | (509) 838-8965 |
| Electro Engineering 208 N Crestline St, Spokane 99202 | (509) 535-4800 |
| Hope Engineering Svc 1305 N Wellington Pl, Spokane 99205 | (509) 879-5214 |
| Otterhaven Engineering Llc 8513 S Cheney Spokane Rd, Spokane 99224 | (509) 448-4505 |
| Titan Engineering Llc 12402 N Division St 256, Spokane 99218 | (509) 276-2905 |