Harmon Insurance Agency/ div. Preston Insurance agency, LLC
- BCBS of IL
- Carthage Mutual
- Chubb
- CNA Surety
- Dairyland
- EMC
- Erie Insurance
- Farmers Mutual Hail Insurance Company of Iowa
- Fidelity & Guaranty Life
- Foremost
- GuideOne
- Hagerty
- IMT Insurance
- Markel
- Mutual of Omaha
- Pekin
- Philadelphia
- Progressive
- Travelers
- United Healthcare
- VFIS
- Bill Preston, Owner
- Angie Preston, Owner