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About North Haven Insurance Group - North Haven Insurance Group HOME AUTO & HOME BUSINESS ABOUT BLOG CONTACT 203.288.8429 | 299 Washington Ave. Unit 21, Hamden, CT 06518 | P.O. Box 340 North Haven CT 06473-2214 About NHIG Insuring your property and protecting yourself against loss can be like trying to crack a walnut with a knife and fork – you need the right tools and expertise for the job.