| Business | Phone |
| Aaron Poe Investigations Seattle 98199 | (206) 214-8244 |
| W W Hoeller & Co 2154 N 50th St, Seattle 98103 | (206) 523-3700 |
| Thomas Holmes Co 1425 4th Ave, Seattle 98101 | (206) 624-4479 |
| Private Investigations 1902 2nd Ave 609, Seattle 98101 | (206) 624-9838 |
| Rose Winquist Co Inc 1119 1st Ave 306, Seattle 98101 | (206) 340-8751 |
| Seattle Detective Bureau Legal 1331 3rd Ave 520, Seattle 98101 | (206) 624-9624 |
| Seattle Investigative Svc 1904 Pike Pl 1237, Seattle 98101 | (206) 910-8888 |
| Research & Investigative Assoc Po Box 20216, Seattle 98102 | (206) 324-6300 |
| Kessler International 701 5th Avenue, 42nd Floor, Seattle 98104 | (206) 262-8108 |
| Personal Background Invstgtns 516 3rd Ave, Seattle 98104 | (206) 233-1948 |
| Professional Immigration Svc 418 7th Ave S, Seattle 98104 | (206) 622-9439 |
| Linda Montgomery Investigation 1751 Nw 57th St, Seattle 98107 | (206) 784-8151 |
| Seabold Group 2442 Nw Market St, Seattle 98107 | (206) 522-1152 |
| Pinkerton Investigation Svc 5950 6th Ave S 205, Seattle 98108 | (206) 767-2240 |
| Kearns Investigations Po Box 9774, Seattle 98109 | (206) 256-6452 |
| Prokop Communications Seattle 98109 | (206) 378-5560 |
| Stafford Legal Investigation Po Box 14433, Seattle 98114 | (206) 784-2696 |
| Ruddell International 1608 15th Ave W B-E, Seattle 98119 | (206) 622-1141 |
| Spy Connection 1608 15th Ave W, Seattle 98119 | (206) 583-0560 |
| Pacific Rim Investigations Inc 2601 Elliott Ave 3158, Seattle 98121 | (206) 448-6068 |
| Poth Investigations Inc 1525 14th Ave, Seattle 98122 | (206) 323-7020 |
| Walker Investigations Co Seattle 98122 | (206) 329-1180 |
| Leigh Hearon Investigative Svc Seattle 98125 | (206) 363-3398 |
| Raven Agency Seattle 98125 | (206) 361-7291 |
| Taraviras & Assoc Seattle 98125 | (206) 440-9392 |
| Probe Northwest Inc Po Box 17508, Seattle 98127 | (206) 782-4444 |
| Wesley W Ewart Private Invstgr Po Box 95828, Seattle 98145 | (425) 646-1143 |
| Roger E Dunn Co Inc 1001 4th Ave 4400, Seattle 98154 | (206) 682-8091 |
| Minnich Polygraph Svc Po Box 66271, Seattle 98166 | (253) 874-3458 |