Williamson Insurance Service
- Acuity Insurance
- Aegis
- Auto-Owners
- Chubb
- Foremost
- Grange
- Hagerty
- Hanover
- Hastings Mut.
- Max Mut. Aid
- Nationwide
- Ohio Mutual
- Pekin
- Philadelphia
- Progressive
- Selective
- Travelers
- Utica National Insurance Group
- Jeffrey A. Williamson, President/CEO
- Connie Williamson, V.P.
- Jason Williamson, CIC, CPIA, COO