According to North American Numbering Plan, 603428 located in Henniker, NH, New Hampshire. the first three digits 603 locate to state New Hampshire, 428 locate the city Henniker, NH, furthermore, we also provide some other information such as the zip code example(s) Invalid, carrier MERRIMACK CO. TELEPHONE CO., D, 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.