National area and sectional center facility (SCF). Digits 4–5: Specific post office or local delivery area.
For businesses operating in Palatine, the 9-digit code is a financial tool. Companies that send bulk mail—such as the marketing flyers often seen in Palatine mailboxes—receive significant postage discounts if they barcode their mail with the full 9-digit code. This allows for "presort" discounts because the USPS has to do less work to sort the mail. For a local Palatine business sending thousands of flyers, those savings add up quickly. palatine zip code 9-digit
Delivery segment (a specific side of a street, a high-rise floor, or a specific block of P.O. boxes). Primary Palatine 5-Digit ZIP Codes National area and sectional center facility (SCF)