ZIP Codes of Weston County, WY

Population & People
Population & People
Total Population
1,562
Household Income
Household Income
Median Income
$94,294
Housing
Housing
Total Housing Units
887
Business & Economy
Business & Economy
Total Businesses
51
Employment
Employment
Employment Rate
62.39%
Education
Education
Bachelor's Degree+
15.90%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 3 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:307
Timezone:Mountain (GMT -07:00)
Local Time:2:14:26 PM
Population:1,562 [See All]
FIPS:56045
Land Area:2,539 sq mi
Water Area:1 sq mi
Coordinates:44.0627, -104.4526
Quick Link:
https://www.zip-codes.com/county/wy-weston.asp
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Extreme geographic sprawl
The largest ZIP spans 287× the smallest by area — 1,834.1 sq mi down to 6.39.
Among Wyoming's 5 oldest counties
Median age 47.4.
Striking education divide
Bachelor's share spans 12.1% to 58.0% — a 46-point gap.

Standout ZIPs in this County


Most Populous
Newcastle · 5,459 people
77.8% of county total
Highest Income
Osage · $116,429 median
1.2× county average
Largest Land Area
Newcastle · 1,834.1 sq mi
Spans the most ground
Fastest Growth
Upton · 0.9% (10-yr)
1,409 → 1,422 residents
Most Educated
Newcastle · 21.0% bachelor's+
835 of 3,980 adults 25+

Things worth knowing about Weston County


7,021 residents live across 4 ZIPs covering 2,539 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 7,275 to 7,021 from 2014 to 2024 — a -3.5% change. 1 ZIPs gained residents, 2 lost.

The county's wealthiest ZIP 82723 (Osage, $116,429 median) and poorest ZIP 82730 (Upton, $72,159) are 22.3 miles apart — a 1.6× income gap across local geography.

Median home values vary 1.6× across this county — from $193,800 in 82730 (Upton) to $312,100 in 82723 (Osage).

Density varies across the county — from 1 people/sq mi in 82723 (Osage) to 3 in 82701 (Newcastle).

Educational attainment ranges from 12.1% bachelor's+ in 82730 (Upton) to 58.0% in 82723 (Osage) — the breadth of educational profiles across the area.

Within Wyoming, this is the #27 most populous of 28 counties and ranks #6 for median household income .

Weighted by population, the typical household earns about $87,630 across the county — reflecting what a typical resident sees, not a simple ZIP average.

19.8% of adults age 25+ hold a bachelor's degree or higher (1,025 of 5,175 reporting).

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

Stories about Weston 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
2,539
square miles
Avg density
2.8
people per sq mi
Population
7,021
across 4 ZIPs
Newcastle
1,834.1 sq mi
5,459 residents
Upton
587.8 sq mi
1,422 residents
Osage
110.8 sq mi
140 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.

Newcastle

Population decline

Weston County lost 10.0% of residents between 2014 and 2024.

All ZIP Codes in Weston County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
82701NewcastleStandard5,459$90,9221,834.1-1.5%
82730UptonStandard1,422$72,159587.80.9%
82723OsageStandard140$116,429110.8-57.1%
82715Four CornersStandard6.4

Adjacent & Nearby Counties