| ZIP Codes: | 16 ZIP Codes (12 Standard, 4 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:00 PM |
| Population: | 38,206 [See All] |
| FIPS: | 17055 |
| Land Area: | 460 sq mi |
| Water Area: | 23 sq mi |
| Coordinates: | 37.9726, -88.9686 |
| Quick Link: |
38,206 residents live across 16 ZIPs covering 460 sq mi, served by 16 distinct USPS-recognized cities.
Population moved from 40,560 to 38,206 from 2014 to 2024 — a -5.8% change. 7 ZIPs gained residents, 8 lost.
The county's wealthiest ZIP 62897 (Whittington, $78,125 median) and poorest ZIP 62891 (Valier, $27,344) are 8.1 miles apart — a 2.9× income gap across local geography.
Median home values vary 2.8× across this county — from $54,000 in 62874 (Orient) to $153,200 in 62865 (Mulkeytown).
Density varies 112× across the county — from 22 people/sq mi in 62836 (Ewing) to 2,428 in 62825 (Coello).
Educational attainment ranges from 1.9% bachelor's+ in 62874 (Orient) to 26.0% in 62983 (Royalton) — the breadth of educational profiles across the area.
Within Illinois, this is the #35 most populous of 102 counties and ranks #96 for median household income .
Weighted by population, the typical household earns about $57,062 across the county — reflecting what a typical resident sees, not a simple ZIP average.
15.5% of adults age 25+ hold a bachelor's degree or higher (4,210 of 27,075 reporting).
12 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.
Franklin County lost 5.8% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 62812 | Benton | Standard | 11,611 | $60,539 | 99.8 | 3.1% |
| 62896 | West Frankfort | Standard | 10,627 | $55,458 | 63.0 | -13.2% |
| 62884 | Sesser | Standard | 2,758 | $58,679 | 37.6 | -0.5% |
| 62822 | Christopher | Standard | 2,581 | $47,770 | 2.4 | -14.7% |
| 62890 | Thompsonville | Standard | 2,377 | $54,271 | 100.2 | -17.7% |
| 62865 | Mulkeytown | Standard | 2,037 | $67,798 | 52.1 | 2.4% |
| 62983 | Royalton | Standard | 1,728 | $57,667 | 22.6 | 34.5% |
| 62999 | Zeigler | Standard | 1,267 | $41,553 | 7.3 | -32.2% |
| 62836 | Ewing | Standard | 891 | $73,281 | 41.2 | 21.7% |
| 62897 | Whittington | Standard | 542 | $78,125 | 24.7 | 30.6% |
| 62891 | Valier | PO Box | 514 | $27,344 | 0.8 | -15.7% |
| 62874 | Orient | Standard | 440 | $40,625 | 3.6 | -3.9% |
| 62856 | Logan | PO Box | 332 | $60,750 | 0.9 | 7.1% |
| 62825 | Coello | PO Box | 254 | $48,750 | 0.1 | 42.7% |
| 62819 | Buckner | Standard | 247 | $45,341 | 3.3 | -52.2% |
| 62840 | Frankfort Heights | PO Box | — | — | 0.0 | — |