According to North American Numbering Plan, 773903 located in CHICAGO, Illinois. the first three digits 773 locate to state Illinois, 903 Cellular locate the city CHICAGO, furthermore, we also provide some other information such as the zip code example(s) 60606, 60654, 60603, carrier AMERICAN MESSAGING SERVICES, L, and the latitude and longitude is 41.8839 -87.6369. 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.

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