| Business | Phone |
| A1 Investigation & Process Svc 600 S Main St, Oshkosh 54902 | (920) 235-8082 |
| Cal Phillipps & Assoc Fire Inv 322 Court St, Oshkosh 54901 | (920) 233-4001 |
| Daniel G Hughes & Assoc Inc 1420 Bismarck Ave, Oshkosh 54902 | (920) 232-1190 |
| Info Finders Po Box 166, Oshkosh 54903 | (920) 720-0850 |