| Business | Phone |
| Allied Investigations Seattle 98125 | (206) 367-3780 |
| American Detective Agency 1001 4th Ave, Seattle 98154 | (206) 782-6900 |
| Amwest Inc Po Box 55130, Seattle 98155 | (206) 361-7552 |
| Avocet Investigation 85 S Washington St, Seattle 98104 | (206) 850-3930 |
| B R Fitz Co 1001 4th Ave, Seattle 98154 | (206) 622-6353 |
| Background Checks Northwest Po Box 77446, Seattle 98177 | (206) 363-1401 |
| Bayside Investigations 2608 2nd Ave 2450, Seattle 98121 | (206) 622-1047 |
| Benett Investigations Inc 5900 Sw Charlestown St, Seattle 98116 | (206) 510-1301 |
| Burke Investigation 8413 Greenwood Ave W # 428, Seattle 98104 | (206) 346-2253 |
| Charles Ingrasci Private 506 2nd Ave # 2300, Seattle 98104 | (206) 292-1742 |
| Custody Specialists 4500 9th Ave Ne 300, Seattle 98105 | (206) 374-8601 |
| Death Investigations 2021 1st Ave # G4, Seattle 98121 | (206) 443-1548 |
| Eagles Eye Consultants & Invst Seattle 98122 | (206) 324-5393 |
| Emphasis Technography Seattle 98101 | (206) 343-0898 |
| Factual Research Co 1916 Pike Pl 12, Seattle 98101 | (206) 849-7079 |
| Brian P Fairchild & Assoc 2608 2nd Ave 185, Seattle 98121 | (206) 284-7068 |
| Greenwood & Co 810 3rd Ave, Seattle 98104 | (206) 624-3988 |
| Henderson Investigative Svc Seattle 98109 | (206) 283-0961 |
| Gerald Adams Pi Inc 8315 Lake City Way Ne 191, Seattle 98115 | (206) 601-1749 |
| Global Research Co 1016 E Pike St, Seattle 98122 | (206) 322-4885 |
| Global Tracing Po Box 69518, Seattle 98168 | (206) 439-9130 |
| Howard M Murphy Pro Svc 5407 S Budd Ct, Seattle 98118 | (206) 760-9834 |
| Ins Investigation Bureau Inc 9750 3rd Ave Ne 300, Seattle 98115 | (206) 522-5825 |
| Insight Investigations 600 1st Ave 427c, Seattle 98104 | (206) 382-9919 |
| Institute-Legal Investigators 2208 Nw Market St # 305, Seattle 98107 | (206) 706-7047 |
| Inter-Tel Detective Agency 77 S Main St, Seattle 98104 | (206) 447-3333 |
| International Genealogical Src Po Box 34000, Seattle 98124 | (206) 292-9697 |
| J & R Intl Investigations 1136 25th Ave, Seattle 98122 | (206) 328-1236 |
| James W Scheel Inc 1836 Westlake Ave N 104, Seattle 98109 | (206) 282-4382 |
| Jeff Steinborn Law Offices 506 2nd Ave 30, Seattle 98104 | (206) 292-9767 |
| John R Hansen Inc 1420 5th Ave 2200, Seattle 98101 | (206) 223-9530 |
| Kessler International 701 5th Avenue, 42nd Floor, Seattle 98104 | (206) 262-8108 |