| ZIP Codes: | 7 ZIP Codes (5 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 779 / 815 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:20 PM |
| Population: | 5,673 [See All] |
| FIPS: | 17155 |
| CBSA: | Ottawa, IL |
| Land Area: | 197 sq mi |
| Water Area: | 12 sq mi |
| Coordinates: | 41.2054, -89.2582 |
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5,673 residents live across 7 ZIPs covering 197 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 5,949 to 5,673 from 2014 to 2024 — a -4.6% change. 4 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 61336 (Magnolia, $92,298 median) and poorest ZIP 61363 (Standard, $60,000) are 10.5 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.1× across this county — from $108,100 in 61363 (Standard) to $222,100 in 61560 (Putnam).
Density varies 50× across the county — from 11 people/sq mi in 61560 (Putnam) to 567 in 61340 (Mark).
Educational attainment ranges from 16.0% bachelor's+ in 61363 (Standard) to 39.6% in 61560 (Putnam) — the breadth of educational profiles across the area.
Within Illinois, this is the #95 most populous of 102 counties and ranks #35 for median household income .
Weighted by population, the typical household earns about $78,714 across the county — reflecting what a typical resident sees, not a simple ZIP average.
23.0% of adults age 25+ hold a bachelor's degree or higher (961 of 4,172 reporting).
5 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 61326 | Granville | Standard | 1,953 | $70,880 | 49.1 | -16.3% |
| 61327 | Hennepin | Standard | 1,442 | $89,306 | 42.7 | 7.7% |
| 61336 | Magnolia | Standard | 694 | $92,298 | 36.5 | -1.3% |
| 61340 | Mark | PO Box | 545 | $78,750 | 1.0 | 63.2% |
| 61560 | Putnam | Standard | 477 | $73,333 | 42.1 | 8.2% |
| 61335 | Mc Nabb | Standard | 312 | $71,750 | 24.6 | -45.4% |
| 61363 | Standard | PO Box | 250 | $60,000 | 0.7 | 9.6% |