According to North American Numbering Plan, 603815 located in DURHAM, New Hampshire. the first three digits 603 locate to state New Hampshire, 815 locate the city DURHAM, furthermore, we also provide some other information such as the zip code example(s) 03824, 03861, carrier TELEPORT COMMUNICATIONS AMERIC, and the latitude and longitude is 43.1331 -70.9221. 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.