- Integrated Pulmonary Physician
- Intermediate Unit 1 Child Alrt
- Intermediate Unit I
- Intermediate Unit One
- Internet Providers Inc
- Interstate Enterprises
- Investors Capitol Investment
- Ionics Inc
- Ironworkers District Council
- Isaly Counseling Assoc
- Island Air
- Ivana Liberatore PC
- J & A Heating & Cooling
- J & B Odd Lot Sales Inc
- J & D Waterproofing
- J & L Testing Co
