According to North American Numbering Plan, 301340 located in ROCKVILLE, Maryland. the first three digits 301 locate to state Maryland, 340 locate the city ROCKVILLE, furthermore, we also provide some other information such as the zip code example(s) 20850, 20851, 20852, carrier VERIZON MARYLAND, INC., and the latitude and longitude is 39.0815 -77.1503. 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.