Interboro Insurance provides homeowners and auto insurance to policyholders in the New York Metropolitan area through a stron ... g local network of insurance brokers. Interboro is the oldest insurance company continually based on Long Island, operating since 1914. Interboro recently completed an acquisition of the AutoOne companies from OneBeacon Insurance Group. Interboro's home offices are located in Mineola, NY, with a branch office handling claims in Syracuse, NY. read more