Illinois ZIP Codes: Ranges, Prefixes and Major Cities
Illinois uses 1,568 active ZIP codes, running from 60002 to 62999. This guide shows how those codes are grouped, which ones serve the state's largest cities and how to format them correctly.
ZIP code range and prefixes
Every Illinois ZIP code starts with one of 29 three-digit prefixes. Each prefix points to a sectional center facility, the processing plant that sorts mail for a group of nearby post offices.
- 600
- 601
- 602
- 603
- 604
- 605
- 606
- 607
- 608
- 609
- 610
- 611
- 612
- 613
- 614
- 615
- 616
- 617
- 618
- 619
- 620
- 622
- 623
- 624
- 625
- 626
- 627
- 628
- 629
Types of ZIP codes in Illinois
| Type | Count | What it covers |
|---|---|---|
| Standard | 1,258 | Street delivery areas |
| PO Box | 228 | Post office boxes only |
| Unique | 82 | A single high-volume organization |
ZIP codes for major Illinois cities
| City | County | Standard ZIPs | Range |
|---|---|---|---|
| Chicago | Cook County | 58 | 60601–60701 |
| Rockford | Winnebago County | 9 | 61101–61114 |
| Peoria | Peoria County | 8 | 61602–61615 |
| Springfield | Sangamon County | 7 | 62701–62712 |
| East Saint Louis | St. Clair County | 6 | 62201–62207 |
| Aurora | DuPage County | 5 | 60502–60506 |
| Joliet | Will County | 5 | 60431–60436 |
| Belleville | St. Clair County | 4 | 62220–62226 |
| Decatur | Macon County | 4 | 62521–62526 |
| Naperville | DuPage County | 4 | 60540–60565 |
| Schaumburg | Cook County | 4 | 60173–60195 |
| Bloomington | McLean County | 3 | 61701–61705 |
| Carbondale | Jackson County | 3 | 62901–62903 |
| Champaign | Champaign County | 3 | 61820–61822 |
| Elgin | Kane County | 3 | 60120–60124 |
Springfield is the state capital. Larger cities have many ZIP codes because each code follows mail delivery routes, not city limits.
Sample addresses
James Reed
919 Main Rd
Bloomington, IL 61705
David Chen
9233 Pine Blvd
Aurora, IL 60505
Mary Smith
6847 Summit Pl
Belleville, IL 62223
These examples use real city and ZIP pairs with invented street lines, so they are safe for testing and documentation.
Tips for working with these ZIP codes
- Store ZIP codes as text, not numbers, so the format stays consistent across states with leading zeros.
- All of Illinois is in the Central time zone, which keeps scheduling logic simple.
- A quick sanity check: a valid IL ZIP code begins with one of the prefixes listed above.
- City names in addresses are post office names. A suburb may share a ZIP code and city name with a nearby larger town.
Create realistic Illinois addresses for testing, with real cities, counties and ZIP codes.
Generate Illinois addresses