ZIP Codes of Ohio County, KY

Population & People
Population & People
Total Population
21,936
Household Income
Household Income
Median Income
$56,689
Housing
Housing
Total Housing Units
9,483
Business & Economy
Business & Economy
Total Businesses
353
Employment
Employment
Employment Rate
51.96%
Education
Education
Bachelor's Degree+
13.35%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 12 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:12 ZIP Codes (11 Standard, 1 PO Box, 0 Unique) [See All]
Area Codes:270 / 364
Timezone:Central (GMT -06:00)
Local Time:2:12:21 PM
Population:21,936 [See All]
FIPS:21183
Land Area:601 sq mi
Water Area:9 sq mi
Coordinates:37.4725, -86.8153
Quick Link:
https://www.zip-codes.com/county/ky-ohio.asp
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Wide geographic spread
ZIPs range from 150.6 sq mi down to 0.85 — a 176× sprawl ratio.

Standout ZIPs in this County


Most Populous
Beaver Dam · 9,128 people
41.6% of county total
Highest Income
Reynolds Station · $76,208 median
1.3× county average
Largest Land Area
Beaver Dam · 150.6 sq mi
Spans the most ground
Fastest Growth
Horse Branch · 75.6% (10-yr)
1,117 → 1,962 residents
Most Educated
Hartford · 17.4% bachelor's+
692 of 3,970 adults 25+

Things worth knowing about Ohio County


21,936 residents live across 12 ZIPs covering 601 sq mi, served by 12 distinct USPS-recognized cities.

Population moved from 22,602 to 21,936 from 2014 to 2024 — a -2.9% change. 4 ZIPs gained residents, 8 lost.

The county's wealthiest ZIP 42368 (Reynolds Station, $76,208 median) and poorest ZIP 42333 (Cromwell, $33,969) are 23.2 miles apart — a 2.2× income gap across local geography.

Median home values vary 2.0× across this county — from $77,300 in 42369 (Rockport) to $158,000 in 42368 (Reynolds Station).

Density varies 30× across the county — from 11 people/sq mi in 42361 (Olaton) to 332 in 42354 (Mc Henry).

Educational attainment ranges from 1.4% bachelor's+ in 42354 (Mc Henry) to 17.4% in 42347 (Hartford) — the breadth of educational profiles across the area.

Within Kentucky, this is the #51 most populous of 120 counties and ranks #65 for median household income .

Weighted by population, the typical household earns about $57,124 across the county — reflecting what a typical resident sees, not a simple ZIP average.

13.3% of adults age 25+ hold a bachelor's degree or higher (1,990 of 14,908 reporting).

11 Standard delivery, 1 PO Box only, 0 single-entity Unique ZIPs serve this county.

Stories about Ohio County


Big & sparse

A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.

Total area
601
square miles
Avg density
36.5
people per sq mi
Population
21,936
across 12 ZIPs
Beaver Dam
150.6 sq mi
9,128 residents
Hartford
117.6 sq mi
5,829 residents
Fordsville
82.5 sq mi
1,267 residents

All ZIP Codes in Ohio County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
42320Beaver DamStandard9,128$54,730150.66.9%
42347HartfordStandard5,829$60,900117.60.3%
42349Horse BranchStandard1,962$58,60155.875.6%
42343FordsvilleStandard1,267$52,67982.5-30.6%
42328CentertownStandard1,158$57,67968.4-25.2%
42368Reynolds StationStandard989$76,20847.5-15.3%
42333CromwellStandard644$33,96934.4-51.1%
42361OlatonStandard425$43,75038.2-19.0%
42354Mc HenryStandard283$65,6250.9-11.3%
42369RockportStandard223$62,7503.1-32.6%
42370RosinePO Box160.1
42338DundeeStandard122.1-88.0%

Adjacent & Nearby Counties