what is my zip code extra 4 digits

The extra 4 digits on ZIP codes, also known as ZIP+4 codes, are appended to the traditional 5-digit ZIP codes used by the USPS. These additional digits help identify specific groups of delivery points within a given ZIP code, representing specific delivery routes within delivery areas. Each ZIP+4 code typically includes 10 to 20 homes or locations, and they can change regularly due to factors such as the quantity of postal employees, new construction, and remapping of delivery areas. Using the full ZIP code with the extra 4 digits when mailing via the USPS ensures the fastest and most accurate mail delivery possible. To find the ZIP+4 code for your address, you can use the ZIP+4 code lookup tool provided by the USPS on their website or other reliable sources. Its important to keep address lists and mailing labels up to date with the most current ZIP+4 codes available to ensure that your mail is delivered to the correct location in a timely and efficient manner.