According to North American Numbering Plan, 603478 located in Hillsboro, NH, New Hampshire. the first three digits 603 locate to state New Hampshire, 478 locate the city Hillsboro, NH, furthermore, we also provide some other information such as the zip code example(s) Invalid, carrier GRANITE STATE TELEPHONE, INC., and the latitude and longitude is N/A. Please pay attention that the detail we provide only as a reference, the details of the zip code may be not complete, the latitude and longitude likely to have deviation.

Here are some random corresponding phone numbers.