County ZIP codes · Illinois · FIPS 17177
Stephenson County, IL ZIP Codes
Stephenson County, Illinois has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 14 of the residential ones lie mainly in Stephenson County and 5 mainly in a neighboring county; 11 cross the county line. Median household income ranges from $56,593 in 61032 (Freeport) to $105,150 in 61019 (Davis) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Stephenson 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 $75,769 and $84,167.
They carry 19 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 19 residential ZIP codes in Stephenson County
14 ZIP codes lie mainly in Stephenson County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 61032 | Freeport | 29,020 | 195 | $57k | $112k | 100% |
| 61048 | Lena | 3,786 | 46 | $83k | $167k | 91% |
| 61019 | Davis | 3,461 | 93 | $105k | $232k | 62% |
| 61062 | Pearl City | 1,840 | 25 | $67k | $197k | 91% |
| 61060 | Orangeville | 1,554 | 42 | $77k | $161k | 100% |
| 61070 | Rock City | 1,322 | 41 | $84k | $157k | 100% |
| 61018 | Dakota | 1,034 | 31 | $77k | $158k | 100% |
| 61039 | German Valley | 824 | 29 | $84k | $181k | 62% |
| 61013 | Cedarville | 690 | 1,468 | $68k | $126k | 100% |
| 61089 | Winslow | 526 | 12 | $66k | $116k | 96% |
| 61067 | Ridott | 450 | 14 | $67k | $171k | 100% |
| 61044 | Kent | 225 | 17 | $82k | $150k | 66% |
| 61050 | McConnell | 199 | 19 | $75k | $124k | 100% |
| 61027 | Eleroy | 33 | 65 | – | – | 100% |
Partly in Stephenson County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 61007 | Baileyville | 196 | 8 | – | – | 43% |
| 61078 | Shannon | 1,459 | 26 | $76k | $133k | 18% |
| 61063 | Pecatonica | 4,011 | 54 | $84k | $174k | 16% |
| 61087 | Warren | 1,588 | 58 | $77k | $109k | 7% |
| 61047 | Leaf River | 1,622 | 24 | $86k | $242k | 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?
11 ZIP codes of Stephenson County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Stephenson | Elsewhere |
|---|---|---|
| 61063 | 16% | Winnebago County 84% |
| 61048 | 91% | Jo Daviess County 9% |
| 61019 | 62% | Winnebago County 38% |
| 61062 | 91% | Jo Daviess County 7%; Carroll County 2% |
| 61047 | 2% | Ogle County 92%; Winnebago County 6% |
| 61087 | 7% | Jo Daviess County 93% |
| 61078 | 18% | Carroll County 66%; Ogle County 16% |
| 61039 | 62% | Ogle County 38% |
| 61089 | 96% | Jo Daviess County 4% |
| 61044 | 66% | Jo Daviess County 34% |
| 61007 | 43% | Ogle County 57% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
Which first three digits do Stephenson County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Stephenson County starts with 610.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 610 | Palatine, IL (SCF 600) | 19 | 66 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.