Thus, from the perspective of the U.S. Postal Service, the city of ... Houston is in Fort Bend County in the ZIP code 77489, and residents there must use the ... ManyZIPcodes are for villages, ....
Alphanumeric systems can, given the same number of ... there is no a priori reason why numeric postal codes cannot be equally precise, as illustrated by 9- and 11-digit codes in the United States.
