ZIP Codes of Gilliam County, OR

Population & People
Population & People
Total Population
1,946
Household Income
Household Income
Median Income
$67,492
Housing
Housing
Total Housing Units
1,110
Business & Economy
Business & Economy
Total Businesses
69
Employment
Employment
Employment Rate
48.65%
Education
Education
Bachelor's Degree+
20.98%
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:3 ZIP Codes (3 Standard, 0 PO Box, 0 Unique) [See All]
Area Code:541
Timezone:Pacific (GMT -08:00)
Local Time:2:13:28 PM
Population:1,946 [See All]
FIPS:41021
Land Area:1,203 sq mi
Water Area:18 sq mi
Coordinates:45.4722, -120.2121
Quick Link:
https://www.zip-codes.com/county/or-gilliam.asp
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Among Oregon's 5 oldest counties
Median age 51.4.

Standout ZIPs in this County


Most Populous
Condon · 1,014 people
52.1% of county total
Highest Income
Arlington · $77,258 median
1.1× county average
Largest Land Area
Condon · 776.9 sq mi
Spans the most ground
Fastest Growth
— growth not calculable
Most Educated
— no education data

Things worth knowing about Gilliam County


1,946 residents live across 3 ZIPs covering 1,203 sq mi, served by 3 distinct USPS-recognized cities.

Population moved from 1,842 to 1,946 from 2014 to 2024 — a +5.6% change. 2 ZIPs gained residents, 0 lost.

The county's wealthiest ZIP 97812 (Arlington, $77,258 median) and poorest ZIP 97823 (Condon, $57,727) are 20.8 miles apart — a 1.3× income gap across local geography.

Median home values vary 2.0× across this county — from $150,500 in 97823 (Condon) to $293,500 in 97812 (Arlington).

Density varies across the county — from 1 people/sq mi in 97823 (Condon) to 2 in 97812 (Arlington).

Educational attainment ranges from 15.1% bachelor's+ in 97812 (Arlington) to 25.8% in 97823 (Condon) — the breadth of educational profiles across the area.

Within Oregon, this is the #34 most populous of 38 counties and ranks #25 for median household income with the #28 fastest decade growth .

Weighted by population, the typical household earns about $67,081 across the county — reflecting what a typical resident sees, not a simple ZIP average.

21.0% of adults age 25+ hold a bachelor's degree or higher (309 of 1,473 reporting).

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

Stories about Gilliam 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
1,203
square miles
Avg density
1.6
people per sq mi
Population
1,946
across 3 ZIPs
Condon
776.9 sq mi
1,014 residents
Arlington
426.0 sq mi
932 residents

All ZIP Codes in Gilliam County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
97823CondonStandard1,014$57,727776.95.0%
97812ArlingtonStandard932$77,258426.06.4%
97861MikkaloStandard0.0

Adjacent & Nearby Counties