ZIP Codes of Caldwell County, KY

Population & People
Population & People
Total Population
12,535
Household Income
Household Income
Median Income
$58,080
Housing
Housing
Total Housing Units
5,862
Business & Economy
Business & Economy
Total Businesses
270
Employment
Employment
Employment Rate
51.24%
Education
Education
Bachelor's Degree+
16.22%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 2 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:2 ZIP Codes (2 Standard, 0 PO Box, 0 Unique) [See All]
Area Codes:270 / 364
Timezone:Central (GMT -06:00)
Local Time:2:12:17 PM
Population:12,535 [See All]
FIPS:21033
Land Area:348 sq mi
Water Area:3 sq mi
Coordinates:37.1717, -87.9797
Quick Link:
https://www.zip-codes.com/county/ky-caldwell.asp
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Kentucky's #86 most populous county
12,535 residents across 2 ZIPs — #86 of 120 Kentucky counties.

Standout ZIPs in this County


Most Populous
Princeton · 10,533 people
84.0% of county total
Highest Income
Fredonia · $61,063 median
1.1× county average
Largest Land Area
Princeton · 272.4 sq mi
Spans the most ground
Fastest Growth
Fredonia · 38.7% (10-yr)
1,443 → 2,002 residents
Most Educated
Princeton · 16.3% bachelor's+
1,228 of 7,548 adults 25+

Things worth knowing about Caldwell County


12,535 residents live across 2 ZIPs covering 348 sq mi, served by 2 distinct USPS-recognized cities.

Population moved from 12,798 to 12,535 from 2014 to 2024 — a -2.1% change. 1 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 42411 (Fredonia, $61,063 median) and poorest ZIP 42445 (Princeton, $55,096) are 8.9 miles apart — a 1.1× income gap across local geography.

Median home values vary 1.2× across this county — from $97,100 in 42411 (Fredonia) to $118,100 in 42445 (Princeton).

Density varies across the county — from 27 people/sq mi in 42411 (Fredonia) to 39 in 42445 (Princeton).

Educational attainment ranges from 16.0% bachelor's+ in 42411 (Fredonia) to 16.3% in 42445 (Princeton) — the breadth of educational profiles across the area.

Within Kentucky, this is the #86 most populous of 120 counties and ranks #61 for median household income .

Weighted by population, the typical household earns about $56,049 across the county — reflecting what a typical resident sees, not a simple ZIP average.

16.2% of adults age 25+ hold a bachelor's degree or higher (1,442 of 8,889 reporting).

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

Stories about Caldwell County


Single-ZIP anchor

One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.

Princeton

All ZIP Codes in Caldwell County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
42445PrincetonStandard10,533$55,096272.4-7.2%
42411FredoniaStandard2,002$61,06375.138.7%

Adjacent & Nearby Counties