| ZIP Codes: | 4 ZIP Codes (3 Standard, 1 PO Box, 0 Unique) [See All] |
| Area Codes: | 618 / 730 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:12:02 PM |
| Population: | 13,475 [See All] |
| FIPS: | 17127 |
| CBSA: | Paducah, KY-IL |
| Land Area: | 281 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 37.2292, -88.7506 |
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13,475 residents live across 4 ZIPs covering 281 sq mi, served by 4 distinct USPS-recognized cities.
Population moved from 14,962 to 13,475 from 2014 to 2024 — a -9.9% change. 0 ZIPs gained residents, 4 lost.
The county's wealthiest ZIP 62908 (Belknap, $90,083 median) and poorest ZIP 62953 (Joppa, $41,563) are 7.3 miles apart — a 2.2× income gap across local geography.
Median home values vary 3.6× across this county — from $45,000 in 62953 (Joppa) to $161,100 in 62908 (Belknap).
Density varies 36× across the county — from 8 people/sq mi in 62908 (Belknap) to 309 in 62953 (Joppa).
Educational attainment ranges from 8.8% bachelor's+ in 62953 (Joppa) to 18.4% in 62960 (Metropolis) — the breadth of educational profiles across the area.
Within Illinois, this is the #78 most populous of 102 counties and ranks #84 for median household income .
Weighted by population, the typical household earns about $63,038 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.0% of adults age 25+ hold a bachelor's degree or higher (1,652 of 9,715 reporting).
3 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Massac County lost 9.9% of residents between 2014 and 2024. ZIPs that shed the largest share: