ZIP Codes of Hamilton County, KS

Population & People
Population & People
Total Population
2,532
Household Income
Household Income
Median Income
$76,550
Housing
Housing
Total Housing Units
1,040
Business & Economy
Business & Economy
Total Businesses
73
Employment
Employment
Employment Rate
64.25%
Education
Education
Bachelor's Degree+
20.43%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 3 ZIPs in this county.
Data Last Updated: July 1, 2026
ZIP Codes:3 ZIP Codes (2 Standard, 1 PO Box, 0 Unique) [See All]
Area Code:620
Timezone:Mountain (GMT -07:00)
Local Time:11:53:30 PM
Population:2,532 [See All]
FIPS:20075
Land Area:1,092 sq mi
Water Area:1 sq mi
Coordinates:38.0100, -101.7603
Quick Link:
https://www.zip-codes.com/county/ks-hamilton.asp
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Kansas's #90 most populous county
2,532 residents across 3 ZIPs — #90 of 106 Kansas counties.

Standout ZIPs in this County


Most Populous
Syracuse · 2,316 people
91.5% of county total
Highest Income
Syracuse · $71,850 median
0.9× county average
Largest Land Area
Syracuse · 716.3 sq mi
Spans the most ground
Fastest Growth
Syracuse · -5.1% (10-yr)
2,441 → 2,316 residents
Most Educated
Syracuse · 18.6% bachelor's+
241 of 1,294 adults 25+

Things worth knowing about Hamilton County


2,532 residents live across 3 ZIPs covering 1,092 sq mi, served by 3 distinct USPS-recognized cities.

Population moved from 2,632 to 2,532 from 2014 to 2024 — a -3.8% change. 1 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 67878 (Syracuse, $71,850 median) and poorest ZIP 67878 (Syracuse, $71,850) are 0.0 miles apart — a 1.0× income gap across local geography.

Median home values vary 1.5× across this county — from $81,700 in 67857 (Kendall) to $118,800 in 67878 (Syracuse).

Density varies across the county — from 1 people/sq mi in 67857 (Kendall) to 3 in 67878 (Syracuse).

Educational attainment ranges from 18.6% bachelor's+ in 67878 (Syracuse) to 47.6% in 67857 (Kendall) — the breadth of educational profiles across the area.

Within Kansas, this is the #90 most populous of 106 counties and ranks #22 for median household income .

Weighted by population, the typical household earns about $72,025 across the county — reflecting what a typical resident sees, not a simple ZIP average.

20.4% of adults age 25+ hold a bachelor's degree or higher (294 of 1,439 reporting).

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

Stories about Hamilton 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
1,092
square miles
Avg density
2.3
people per sq mi
Population
2,532
across 3 ZIPs
Syracuse
716.3 sq mi
2,316 residents
Kendall
283.2 sq mi
172 residents
Coolidge
92.8 sq mi
44 residents

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.

Syracuse

All ZIP Codes in Hamilton County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
67878SyracuseStandard2,316$71,850716.3-5.1%
67857KendallStandard172283.2104.8%
67836CoolidgePO Box44$81,25092.8-58.9%

Adjacent & Nearby Counties