ZIP Codes of Phillips County, CO

Population & People
Population & People
Total Population
4,779
Household Income
Household Income
Median Income
$83,969
Housing
Housing
Total Housing Units
2,262
Business & Economy
Business & Economy
Total Businesses
137
Employment
Employment
Employment Rate
63.43%
Education
Education
Bachelor's Degree+
32.24%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 4 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:4 ZIP Codes (4 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:970
Timezone:Mountain (GMT -07:00)
Local Time:2:11:34 PM
Population:4,779 [See All]
FIPS:08095
Land Area:943 sq mi
Water Area:0 sq mi
Coordinates:40.6046, -102.3635
Quick Link:
https://www.zip-codes.com/county/co-phillips.asp
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Extreme geographic sprawl
The largest ZIP spans 246× the smallest by area — 474.2 sq mi down to 1.93.

Standout ZIPs in this County


Most Populous
Holyoke · 2,999 people
62.8% of county total
Highest Income
Amherst · $104,167 median
1.2× county average
Largest Land Area
Holyoke · 474.2 sq mi
Spans the most ground
Fastest Growth
Haxtun · 10.7% (10-yr)
1,342 → 1,486 residents
Most Educated
Holyoke · 35.1% bachelor's+
726 of 2,071 adults 25+

Things worth knowing about Phillips County


4,779 residents live across 4 ZIPs covering 943 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 4,507 to 4,779 from 2014 to 2024 — a +6.0% change. 3 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 80721 (Amherst, $104,167 median) and poorest ZIP 80734 (Holyoke, $57,891) are 14.3 miles apart — a 1.8× income gap across local geography.

Median home values vary 1.4× across this county — from $235,300 in 80731 (Haxtun) to $326,100 in 80721 (Amherst).

Density varies across the county — from 3 people/sq mi in 80721 (Amherst) to 6 in 80734 (Holyoke).

Educational attainment ranges from 11.2% bachelor's+ in 80721 (Amherst) to 35.1% in 80734 (Holyoke) — the breadth of educational profiles across the area.

Within Colorado, this is the #52 most populous of 65 counties and ranks #26 for median household income with the #33 fastest decade growth .

Weighted by population, the typical household earns about $65,827 across the county — reflecting what a typical resident sees, not a simple ZIP average.

32.2% of adults age 25+ hold a bachelor's degree or higher (1,074 of 3,331 reporting).

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

Stories about Phillips 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
943
square miles
Avg density
5.1
people per sq mi
Population
4,779
across 4 ZIPs
Holyoke
474.2 sq mi
2,999 residents
Haxtun
371.1 sq mi
1,486 residents
Amherst
95.8 sq mi
257 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.

Holyoke

All ZIP Codes in Phillips County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
80734HolyokeStandard2,999$57,891474.20.9%
80731HaxtunStandard1,486$74,375371.110.7%
80721AmherstStandard257$104,16795.874.8%
80746PaoliStandard37$99,4441.9-19.6%

Adjacent & Nearby Counties