sentence: ZIP codes are numbered with the first number representing a certain group of U.S. states.
sentences_after: The second and third numbers represent a region in that group of states or, in some cases, a large city. The fourth and fifth numbers representing a group of delivery addresses within that region. Other towns are often given ZIP codes in numerical order alphabetically.
concept_name: zip code
headings: ZIP code Structure and allocation
categories: United States Postal Service