County ZIP codes · Illinois · FIPS 17037
DeKalb County, IL ZIP Codes
DeKalb County, Illinois has 22 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 13 of the residential ones lie mainly in DeKalb County and 9 mainly in a neighboring county; 15 cross the county line. Median household income ranges from $47,043 in 60115 (Dekalb) to $117,450 in 60151 (Maple Park) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of DeKalb 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 $73,214 and $100,186.
They carry 22 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 22 residential ZIP codes in DeKalb County
13 ZIP codes lie mainly in DeKalb County; 9 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 60115 | Dekalb | 42,536 | 525 | $47k | $209k | 100% |
| 60178 | Sycamore | 22,224 | 331 | $93k | $280k | 93% |
| 60548 | Sandwich | 11,721 | 283 | $83k | $262k | 54% |
| 60135 | Genoa | 7,274 | 155 | $98k | $254k | 96% |
| 60112 | Cortland | 4,621 | 1,264 | $73k | $230k | 100% |
| 60552 | Somonauk | 4,285 | 161 | $113k | $257k | 81% |
| 60520 | Hinckley | 2,979 | 66 | $99k | $321k | 100% |
| 60145 | Kingston | 2,464 | 73 | $109k | $268k | 95% |
| 60146 | Kirkland | 2,369 | 43 | $88k | $222k | 88% |
| 60556 | Waterman | 2,138 | 41 | $100k | $235k | 100% |
| 60150 | Malta | 1,738 | 31 | $87k | $188k | 100% |
| 60550 | Shabbona | 941 | 23 | $82k | $223k | 100% |
| 60111 | Clare | 257 | 12 | $85k | $376k | 100% |
Partly in DeKalb County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 60531 | Leland | 1,885 | 31 | $80k | $229k | 38% |
| 60530 | Lee | 992 | 36 | $96k | $265k | 32% |
| 60129 | Esmond | 229 | 14 | $118k | $188k | 27% |
| 60518 | Earlville | 3,289 | 25 | $70k | $166k | 25% |
| 60151 | Maple Park | 3,888 | 47 | $118k | $347k | 25% |
| 60140 | Hampshire | 22,689 | 280 | $111k | $338k | 4% |
| 60511 | Big Rock | 2,081 | 70 | $159k | $338k | 4% |
| 60152 | Marengo | 12,417 | 130 | $99k | $300k | 2% |
| 61068 | Rochelle | 14,788 | 123 | $73k | $171k | 1% |
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?
15 ZIP codes of DeKalb County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In DeKalb | Elsewhere |
|---|---|---|
| 60140 | 4% | Kane County 95%; McHenry County 1% |
| 60178 | 93% | Kane County 7% |
| 61068 | 1% | Ogle County 89%; Lee County 10% |
| 60152 | 2% | McHenry County 98% |
| 60548 | 54% | LaSalle County 34%; Kendall County 12% |
| 60135 | 96% | McHenry County 2%; Boone County 2% |
| 60552 | 81% | LaSalle County 19% |
| 60151 | 25% | Kane County 75% |
| 60518 | 25% | LaSalle County 66%; Lee County 9% |
| 60145 | 95% | Boone County 5% |
| 60146 | 88% | Boone County 10%; Ogle County 2% |
| 60511 | 4% | Kane County 96% |
| 60531 | 38% | LaSalle County 62% |
| 60530 | 32% | Lee County 68% |
| 60129 | 27% | Ogle County 73% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do DeKalb County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. DeKalb County's ZIP codes use 3 prefixes: 601, 605 and 610.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 601 | Carol Stream, IL (SCF 601) | 12 | 89 |
| 605 | Fox Valley, IL (SCF 605) | 9 | 65 |
| 610 | Palatine, IL (SCF 600) | 1 | 66 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.