| ZIP Codes: | 11 ZIP Codes (8 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Codes: | 220 / 326 / 740 / 937 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:13:22 PM |
| Population: | 77,292 [See All] |
| FIPS: | 39141 |
| CBSA: | Chillicothe, OH |
| Land Area: | 743 sq mi |
| Water Area: | 4 sq mi |
| Coordinates: | 39.3497, -83.0020 |
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77,292 residents live across 11 ZIPs covering 743 sq mi, served by 11 distinct USPS-recognized cities.
Population moved from 78,719 to 77,292 from 2014 to 2024 — a -1.8% change. 3 ZIPs gained residents, 7 lost.
The county's wealthiest ZIP 43115 (Clarksburg, $94,265 median) and poorest ZIP 45681 (South Salem, $49,510) are 13.3 miles apart — a 1.9× income gap across local geography.
Median home values vary 2.7× across this county — from $87,000 in 45673 (Richmond Dale) to $238,300 in 45644 (Kingston).
Density varies 34× across the county — from 28 people/sq mi in 45647 (Londonderry) to 959 in 45673 (Richmond Dale).
Educational attainment ranges from 10.6% bachelor's+ in 45647 (Londonderry) to 18.1% in 45601 (Chillicothe) — the breadth of educational profiles across the area.
Within Ohio, this is the #33 most populous of 88 counties and ranks #66 for median household income .
Weighted by population, the typical household earns about $62,012 across the county — reflecting what a typical resident sees, not a simple ZIP average.
17.1% of adults age 25+ hold a bachelor's degree or higher (9,556 of 55,802 reporting).
8 Standard delivery, 3 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 45601 | Chillicothe | Standard | 55,836 | $59,748 | 346.1 | -1.9% |
| 45628 | Frankfort | Standard | 5,999 | $72,587 | 77.1 | 31.4% |
| 45612 | Bainbridge | Standard | 4,933 | $53,500 | 111.8 | -16.4% |
| 45644 | Kingston | Standard | 4,619 | $74,219 | 61.4 | -0.3% |
| 45647 | Londonderry | Standard | 1,869 | $69,966 | 66.0 | -16.5% |
| 43115 | Clarksburg | Standard | 1,796 | $94,265 | 43.2 | 14.0% |
| 45681 | South Salem | Standard | 1,451 | $49,510 | 36.6 | -21.8% |
| 45673 | Richmond Dale | Standard | 473 | $64,438 | 0.5 | 22.2% |
| 43101 | Adelphi | PO Box | 316 | $39,107 | 0.4 | -20.8% |
| 45617 | Bourneville | PO Box | 0 | — | 0.0 | -100.0% |
| 45633 | Hallsville | PO Box | — | — | 0.0 | — |