- Ioan & Son Electric Co
- Ion Electric LLC
- Iosepa Electric & Contracting
- Iott Electric Inc
- Iott Electric Inc
- Iowa Electric
- Iowa Electric
- Iowa Lakes Electric Co-Op
- Iowa Signal & Electric Co
- IPAC Electric Co
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- Iredell Electric Svc Inc
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- Ireland Advertising & Electric
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- Island Air Conditioning Svc
- Island Coast Elec Constr Inc
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- Islandwide Electric Inc
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- Islesboro Electrical Svc Inc
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- It's Electric
- It's Electric Inc
- It's On Electric
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- Itabo Electric Co
- Itasca Electric
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