ZIP Codes of Grant County, OR

Population & People
Population & People
Total Population
7,079
Household Income
Household Income
Median Income
$54,679
Housing
Housing
Total Housing Units
3,957
Business & Economy
Business & Economy
Total Businesses
202
Employment
Employment
Employment Rate
48.11%
Education
Education
Bachelor's Degree+
17.62%
Source: U.S. Census ACS 2024 5-Year Estimates · rolled up across the 10 ZIPs in this county.
Data Last Updated: June 1, 2026
ZIP Codes:10 ZIP Codes (10 Standard, 0 PO Box, 0 Unique) [See All]
Area Codes:458 / 541
Timezone:Pacific (GMT -08:00)
Local Time:2:13:28 PM
Population:7,079 [See All]
FIPS:41023
Land Area:4,093 sq mi
Water Area:1 sq mi
Coordinates:44.4953, -119.1182
Quick Link:
https://www.zip-codes.com/county/or-grant.asp
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Oregon's #33 most populous county
7,079 residents across 10 ZIPs — #33 of 38 Oregon counties.

Standout ZIPs in this County


Most Populous
John Day · 2,265 people
32.0% of county total
Highest Income
John Day · $68,036 median
1.2× county average
Largest Land Area
Long Creek · 719.1 sq mi
Spans the most ground
Fastest Growth
John Day · -14.0% (10-yr)
2,635 → 2,265 residents
Most Educated
John Day · 16.8% bachelor's+
305 of 1,819 adults 25+

Things worth knowing about Grant County


7,079 residents live across 10 ZIPs covering 4,093 sq mi, served by 10 distinct USPS-recognized cities.

Population moved from 7,253 to 7,079 from 2014 to 2024 — a -2.4% change. 4 ZIPs gained residents, 6 lost.

The county's wealthiest ZIP 97845 (John Day, $68,036 median) and poorest ZIP 97864 (Monument, $39,202) are 35.5 miles apart — a 1.7× income gap across local geography.

Median home values vary 2.5× across this county — from $156,300 in 97873 (Seneca) to $391,700 in 97848 (Kimberly).

Density varies 103× across the county — from 0 people/sq mi in 97873 (Seneca) to 16 in 97845 (John Day).

Educational attainment ranges from 4.4% bachelor's+ in 97864 (Monument) to 23.4% in 97869 (Prairie City) — the breadth of educational profiles across the area.

Within Oregon, this is the #33 most populous of 38 counties and ranks #37 for median household income .

Weighted by population, the typical household earns about $61,429 across the county — reflecting what a typical resident sees, not a simple ZIP average.

17.6% of adults age 25+ hold a bachelor's degree or higher (970 of 5,504 reporting).

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

Stories about Grant 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
4,093
square miles
Avg density
1.7
people per sq mi
Population
7,079
across 10 ZIPs
Long Creek
719.1 sq mi
485 residents
Seneca
711.0 sq mi
109 residents
Prairie City
549.9 sq mi
838 residents

All ZIP Codes in Grant County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
97845John DayStandard2,265$68,036142.8-14.0%
97820Canyon CityStandard1,568$67,115186.059.5%
97865Mount VernonStandard921$59,247415.2-21.0%
97869Prairie CityStandard838$56,875549.9-24.8%
97856Long CreekStandard485$44,318719.116.9%
97825DayvilleStandard347$67,500351.123.0%
97864MonumentStandard316$39,202282.145.0%
97848KimberlyStandard217$50,000370.4-13.9%
97873SenecaStandard109$39,821711.0-26.4%
97817BatesStandard13365.3-66.7%

Adjacent & Nearby Counties