Illinois ZIP codes
All 1,575 ZIPs in Illinois, 60001 to 62999. Tap one on the map or in the list.
1,575
ZIP codes
12,694,745
people live in them
102
counties
179
PO Box & no-area ZIPs
Most people
All 1,575 Illinois ZIP codes
ZIP codes by county
Pick a county for its ZIP list and map. Counts include ZIPs that only partly reach into the county.
- Adams County24
- Alexander County9
- Bond County12
- Boone County15
- Brown County5
- Bureau County31
- Calhoun County8
- Carroll County11
- Cass County9
- Champaign County39
- Christian County20
- Clark County11
- Clay County13
- Clinton County18
- Coles County17
- Cook County228
- Crawford County11
- Cumberland County12
- De Witt County13
- DeKalb County22
- Douglas County13
- DuPage County59
- Edgar County15
- Edwards County6
- Effingham County15
- Fayette County21
- Ford County21
- Franklin County20
- Fulton County24
- Gallatin County9
- Greene County14
- Grundy County16
- Hamilton County13
- Hancock County21
- Hardin County6
- Henderson County17
- Henry County24
- Iroquois County28
- Jackson County23
- Jasper County15
- Jefferson County18
- Jersey County11
- Jo Daviess County15
- Johnson County12
- Kane County40
- Kankakee County22
- Kendall County19
- Knox County23
- LaSalle County29
- Lake County40
- Lawrence County7
- Lee County24
- Livingston County29
- Logan County20
- Macon County29
- Macoupin County29
- Madison County36
- Marion County15
- Marshall County19
- Mason County11
- Massac County8
- McDonough County17
- McHenry County26
- McLean County40
- Menard County9
- Mercer County18
- Monroe County10
- Montgomery County28
- Morgan County17
- Moultrie County11
- Ogle County27
- Peoria County49
- Perry County12
- Piatt County16
- Pike County16
- Pope County10
- Pulaski County10
- Putnam County8
- Randolph County18
- Richland County9
- Rock Island County24
- Saline County11
- Sangamon County58
- Schuyler County12
- Scott County9
- Shelby County22
- St. Clair County37
- Stark County10
- Stephenson County19
- Tazewell County23
- Union County13
- Vermilion County27
- Wabash County8
- Warren County14
- Washington County13
- Wayne County20
- White County12
- Whiteside County15
- Will County46
- Williamson County22
- Winnebago County34
- Woodford County16
Questions people actually ask
How many ZIP codes are in Illinois?
1,575 ZIP codes are in use in Illinois. 1,396 cover a delivery area, and 179 are PO Box, single-building or organization ZIPs with no area of their own.
What do Illinois ZIP codes start with?
Illinois ZIP codes start with these three-digit prefixes: 600–620, 622–629. Each prefix is a mail sorting area run from one processing center.
Which Illinois ZIP code has the most people?
60629 in Chicago has the most residents of any Illinois ZIP, about 108,324 people in the Census Bureau’s ACS 2020–2024 estimates.
Which Illinois county has the most ZIP codes?
Cook County touches 228 ZIP codes, the most of the 102 counties in Illinois. 485 Illinois ZIPs reach into more than one county.
Are these the official USPS ZIP code boundaries?
The map uses Census ZIP Code Tabulation Areas, the standard public stand-in for USPS delivery areas. They match for almost every home. For a mailing address, the USPS ZIP Code lookup has the final word.
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Updated 2026-11-10 · Where the data comes from