Joliet, IL ZIP Codes, Area Codes and Address Format

City guides  |  September 18, 2026  |  2 min read

Looking up ZIP codes or writing an address in Joliet, Illinois? Below is a practical reference built from postal data for the city.

State

Illinois (IL)

County

Will County

Standard ZIP codes

5

Time zone

Central

Joliet ZIP codes

These are the standard delivery ZIP codes for Joliet. The city has 6 ZIP codes in total when PO Box and unique codes are included.

• 60431
• 60432
• 60433
• 60435
• 60436

Area codes in Joliet

Joliet phone numbers use 779 and 815. With more than one code in use, residents on the same street can have different area codes.

Sample Joliet addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Joliet

• End the address with JOLIET, IL and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Joliet has 5 codes, so the city name alone is not enough.

More Illinois cities

Decatur, Schaumburg, Carbondale, Bloomington, Rockford, or see all Illinois cities.