- Connecticut Light & Power office in Hartford (06141-0270)
- Connecticut Light & Power office in Berlin (06037)
- Connecticut Light & Power office in Hartford (06103)
- Connecticut Light & Power office in Greenwich (06830)
- Connecticut Light & Power office in (06052)
- United Illuminating office in New Haven (06506-0901)
- United Illuminating office in Orange (06477)
- United Illuminating office in New Haven (06510)
- Bozrah Light & Power Co. office in Gilman (06336)
- Norwich Dept. of Public Utilities office in Norwich (06360)
- Jewett City Electric Light Plant office in Jewett City (06351)
- Groton Dept. of Utilities office in Groton (06340)
- Wallingford Public Utility office in Wallingford (06492)
- Norwalk Third Tax District office in East Norwalk (06855)
- South Norwalk Electric Works office in Norwalk (06856)