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There are times when you may want to use the 9 digit zip code validation for US. The 9 digit zip code is usually in format like this #####-####. For a 9 digit US zip code validation use below regular Expression. ^([0-9]{5}-[0-9]{4})$.
To provide you with the best experience possible and ensure we are presenting the correct information to you, our website requires customers enter a ZIP code for their service address. Example ZIP codes from across our service territory are provided below. You can also visit the U.S. Postal Service's website to look-up a specific ZIP code. Connecticut â Electric & Gas: 06901. Connecticut â Electric Only: 06101.