County ZIP codes · Illinois · FIPS 17055
Franklin County, IL ZIP Codes
Franklin County, Illinois has 19 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 18 residential and 1 for PO boxes or a single organization. 16 of the residential ones lie mainly in Franklin County and 2 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $41,553 in 62999 (Zeigler) to $67,798 in 62865 (Mulkeytown) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Franklin 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 $47,770 and $58,679.
They carry 18 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 18 residential ZIP codes in Franklin County
16 ZIP codes lie mainly in Franklin County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 62812 | Benton | 11,611 | 118 | $61k | $101k | 100% |
| 62896 | West Frankfort | 10,627 | 176 | $56k | $89k | 91% |
| 62884 | Sesser | 2,758 | 91 | $59k | $97k | 100% |
| 62822 | Christopher | 2,581 | 1,170 | $48k | $68k | 100% |
| 62890 | Thompsonville | 2,377 | 23 | $54k | $108k | 52% |
| 62865 | Mulkeytown | 2,037 | 38 | $68k | $153k | 100% |
| 62983 | Royalton | 1,728 | 74 | $58k | $78k | 100% |
| 62999 | Zeigler | 1,267 | 587 | $42k | $57k | 100% |
| 62836 | Ewing | 891 | 23 | $73k | $124k | 93% |
| 62897 | Whittington | 542 | 38 | $78k | $89k | 100% |
| 62891 | Valier | 514 | 813 | $27k | $79k | 100% |
| 62874 | Orient | 440 | 274 | $41k | $54k | 100% |
| 62860 | Macedonia | 384 | 11 | $80k | $120k | 72% |
| 62856 | Logan | 332 | 220 | $61k | $55k | 100% |
| 62825 | Coello | 254 | 361 | $49k | $69k | 100% |
| 62819 | Buckner | 247 | 74 | $45k | $63k | 100% |
Partly in Franklin County
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?
6 ZIP codes of Franklin County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Franklin | Elsewhere |
|---|---|---|
| 62896 | 91% | Williamson County9% |
| 62890 | 52% | Williamson County23%; Hamilton County16%; Saline County8% |
| 62932 | 2% | Jackson County98% |
| 62836 | 93% | Jefferson County7% |
| 62883 | 13% | Jefferson County71%; Perry County16% |
| 62860 | 72% | Hamilton County28% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 62840 | Frankfort Heights |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Franklin County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Franklin County's ZIP codes use 2 prefixes: 628 and 629.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.