United States ZIP Codes
United States postal codes, known as ZIP codes, are five-digit numbers used to identify specific geographic areas for efficient mail delivery. The first digit represents a region, the next two digits point to a sectional center facility, and the last two digits indicate a specific area, city, or post office. An extended ZIP+4 code adds four additional digits for even more precise location identification. ZIP codes are essential for organizing and speeding up mail sorting and delivery across the country.