Illinois ZIP Code - Postal Codes
Find all Illinois Zip Codes for simple navigation from Johnston City's streets to every corner of Bryant. Explore our comprehensive database to find the exact county zip code you need for efficient mail delivery and seamless navigation. Whether you're searching for a specific location or need to send mail to an Illinois PO Box, our platform ensures you discover Illinois zip codes with ease. Experience swift and reliable mail delivery by accessing accurate postal codes for every corner of Illinois.
How many ZIP Codes are there in Illinois?
There are approximately 1256 active ZIP codes in Illinois. It's important to note that this number may fluctuate slightly as the USPS occasionally adds or removes ZIP codes.
What's the difference between a 5-digit ZIP code and a ZIP+4 code in Illinois?
Illinois ZIP codes: 5-digit = general area, ZIP+4 = specific building (optional, but faster delivery).
How do ZIP codes help with mail delivery in Illinois?
Illinois ZIP codes work like a barcode for mail. it generally 5-digit gets it close, ZIP+4 (optional) finds your exact building. Faster delivery.