

That simple 9-digit number makes routing more efficient since the USPS knows which mail person will put the letter in the mailbox.

What is the zip code for my location full#
ZIP plus 4 lookup tools don't just find the full ZIP Code. No matter what name you use, ZIP plus 4 codes aid the USPS in sorting and distributing mail effectively. ZIP+4 Codes are also frequently referred to "Plus-Four Codes", "ZIP Code Extensions", "9-digit ZIP Codes", "Full ZIP Codes", or simply "Extended ZIP Codes". Using the full ZIP Code with the extra 4 digits when mailing via the USPS ensures the fastest, most accurate mailing possible. ZIP+4 Codes are 4-digit codes appended to the original 5-digit USPS ZIP Codes. USPS ZIP+4 Code lookups are a cinch with the right tools, and Smarty provides easy-to-use options for single ZIP+4 Code lookups, looking up ZIP+4 Codes in bulk (up to millions at a time), and ZIP+4 Code lookup via API. Including those last 4 digits can reduce delivery time by as much as 2 days! That's how ZIP plus 4 codes help prevent misdelivered, lost, delayed, and returned mail. The USPS will also immediately knows every truck, airplane, and facility they'll use along the way. By adding a ZIP+4 to what you mail, the USPS instantly knows the date, time, and carrier that will place your letter in the mailbox. ZIP+4 Codes indicate small geographic areas. For example, a ZIP+4 could indicate floor #16 in a high-rise, a street's north-facing homes, or a large business. The last 4 digits of the ZIP Code represent delivery route segments within delivery areas and generally consist of 10-20 mailboxes. ZIP+4 Codes are 4-digit codes added to traditional ZIP Codes that provide faster routing. ZIP+4 Code™ Lookup - Last 4 Digits of ZIP Codes Meaning & Use
