County ZIP codes · Illinois · FIPS 17093
Kendall County, IL ZIP Codes
Kendall County, Illinois has 17 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 8 of the residential ones lie mainly in Kendall County and 9 mainly in a neighboring county; 12 cross the county line. Median household income ranges from $81,777 in 60450 (Morris) to $155,511 in 60585 (Plainfield) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Kendall County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $97,131 and $122,734.
They carry 15 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 17 residential ZIP codes in Kendall County
8 ZIP codes lie mainly in Kendall County; 9 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 60543 | Oswego | 43,047 | 1,026 | $119k | $344k | 99% |
| 60538 | Montgomery | 30,514 | 3,151 | $97k | $267k | 54% |
| 60560 | Yorkville | 28,795 | 363 | $110k | $346k | 100% |
| 60447 | Minooka | 16,102 | 238 | $108k | $323k | 73% |
| 60545 | Plano | 14,392 | 393 | $87k | $242k | 100% |
| 60541 | Newark | 3,342 | 40 | $118k | $314k | 90% |
| 60512 | Bristol | 1,090 | 166 | $97k | $352k | 100% |
| 60536 | Millbrook | 62 | 463 | $116k | $183k | 100% |
Partly in Kendall County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 60537 | Millington | 726 | 879 | $82k | $230k | 32% |
| 60503 | Aurora | 16,789 | 3,927 | $137k | $325k | 28% |
| 60586 | Plainfield | 47,834 | 2,740 | $132k | $328k | 27% |
| 60431 | Joliet | 27,138 | 2,113 | $123k | $294k | 26% |
| 60544 | Plainfield | 27,306 | 1,128 | $108k | $336k | 26% |
| 60548 | Sandwich | 11,721 | 283 | $83k | $262k | 12% |
| 60585 | Plainfield | 25,960 | 1,744 | $156k | $453k | 12% |
| 60450 | Morris | 20,783 | 132 | $82k | $276k | 2% |
| 60554 | Sugar Grove | 12,081 | 340 | $123k | $386k | 2% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
13 ZIP codes of Kendall County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Kendall | Elsewhere |
|---|---|---|
| 60586 | 27% | Will County 73% |
| 60543 | 99% | |
| 60538 | 54% | Kane County 46% |
| 60544 | 26% | Will County 74% |
| 60431 | 26% | Will County 74% |
| 60585 | 12% | Will County 88% |
| 60450 | 2% | Grundy County 98% |
| 60503 | 28% | Will County 72% |
| 60447 | 73% | Grundy County 21%; Will County 6% |
| 60554 | 2% | Kane County 98% |
| 60548 | 12% | DeKalb County 54%; LaSalle County 34% |
| 60541 | 90% | Grundy County 9% |
| 60537 | 32% | LaSalle County 68% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Kendall County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Kendall County's ZIP codes use 2 prefixes: 604 and 605.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.