Illinois counties
Every county in Illinois, with the ZIP codes recorded in each. Pick one to see its full ZIP code list.
- counties
- 102
- ZIP codes
- 1,575
All Illinois counties
| County | ZIP codes | Largest city |
|---|---|---|
| Adams County | 17 | Quincy |
| Alexander County | 7 | Cairo |
| Bond County | 7 | Donnellson |
| Boone County | 5 | Belvidere |
| Brown County | 3 | Mount Sterling |
| Bureau County | 24 | Arlington |
| Calhoun County | 8 | Batchtown |
| Carroll County | 7 | Chadwick |
| Cass County | 6 | Arenzville |
| Champaign County | 33 | Champaign |
| Christian County | 13 | Assumption |
| Clark County | 6 | Casey |
| Clay County | 6 | Clay City |
| Clinton County | 13 | Albers |
| Coles County | 7 | Ashmore |
| Cook County | 213 | Chicago |
| Crawford County | 8 | Annapolis |
| Cumberland County | 5 | Greenup |
| De Witt County | 8 | Clinton |
| DeKalb County | 14 | Clare |
| Douglas County | 9 | Arcola |
| DuPage County | 53 | Carol Stream |
| Edgar County | 8 | Brocton |
| Edwards County | 5 | Albion |
| Effingham County | 10 | Altamont |
| Fayette County | 9 | Bingham |
| Ford County | 9 | Cabery |
| Franklin County | 16 | Benton |
| Fulton County | 20 | Astoria |
| Gallatin County | 6 | Equality |
| Greene County | 10 | Carrollton |
| Grundy County | 9 | Braceville |
| Hamilton County | 5 | Broughton |
| Hancock County | 16 | Augusta |
| Hardin County | 4 | Cave In Rock |
| Henderson County | 8 | Biggsville |
| Henry County | 16 | Alpha |
| Iroquois County | 24 | Ashkum |
| Jackson County | 16 | Carbondale |
| Jasper County | 7 | Hidalgo |
| Jefferson County | 12 | Belle Rive |
| Jersey County | 8 | Brighton |
| Jo Daviess County | 9 | Apple River |
| Johnson County | 10 | Belknap |
| Kane County | 29 | Aurora |
| Kankakee County | 16 | Aroma Park |
| Kendall County | 8 | Bristol |
| Knox County | 17 | Galesburg |
| Lake County | 33 | Waukegan |
| LaSalle County | 24 | Cedar Point |
| Lawrence County | 4 | Bridgeport |
| Lee County | 14 | Amboy |
| Livingston County | 17 | Ancona |
| Logan County | 14 | Atlanta |
| Macon County | 18 | Decatur |
| Macoupin County | 19 | Benld |
| Madison County | 28 | Edwardsville |
| Marion County | 11 | Alma |
| Marshall County | 9 | Camp Grove |
| Mason County | 9 | Bath |
| Massac County | 3 | Brookport |
| McDonough County | 11 | Adair |
| McHenry County | 20 | Crystal Lake |
| McLean County | 32 | Bloomington |
| Menard County | 6 | Athens |
| Mercer County | 12 | Aledo |
| Monroe County | 7 | Columbia |
| Montgomery County | 16 | Butler |
| Morgan County | 11 | Jacksonville |
| Moultrie County | 5 | Bethany |
| Ogle County | 16 | Baileyville |
| Peoria County | 44 | Peoria |
| Perry County | 5 | Cutler |
| Piatt County | 10 | Bement |
| Pike County | 15 | Barry |
| Pope County | 3 | Eddyville |
| Pulaski County | 9 | Grand Chain |
| Putnam County | 7 | Granville |
| Randolph County | 15 | Baldwin |
| Richland County | 6 | Calhoun |
| Rock Island County | 21 | Rock Island |
| Saline County | 7 | Carrier Mills |
| Sangamon County | 54 | Springfield |
| Schuyler County | 6 | Browning |
| Scott County | 4 | Alsey |
| Shelby County | 13 | Cowden |
| St. Clair County | 30 | East Saint Louis |
| Stark County | 7 | Bradford |
| Stephenson County | 14 | Cedarville |
| Tazewell County | 18 | Pekin |
| Union County | 7 | Alto Pass |
| Vermilion County | 24 | Danville |
| Wabash County | 5 | Allendale |
| Warren County | 8 | Berwick |
| Washington County | 10 | Addieville |
| Wayne County | 11 | Barnhill |
| White County | 10 | Burnt Prairie |
| Whiteside County | 12 | Albany |
| Will County | 33 | Joliet |
| Williamson County | 11 | Cambria |
| Winnebago County | 28 | Rockford |
| Woodford County | 10 | Benson |
Scope every county-equivalent recorded in Illinois. Source Census 2024 county Gazetteer (2024 Gazetteer) and GeoNames US postal codes (2026-07 postal dump). Updated . Names and boundaries follow the Census Bureau's current county-equivalent set, not the IL postal source's older names.