ZIP Codes of Harding County, NM

Population & People
Population & People
Total Population
739
Household Income
Household Income
Median Income
$65,566
Housing
Housing
Total Housing Units
470
Business & Economy
Business & Economy
Total Businesses
8
Employment
Employment
Employment Rate
47.65%
Education
Education
Bachelor's Degree+
27.91%
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:575
Timezone:Mountain (GMT -07:00)
Local Time:2:13:11 PM
Population:739 [See All]
FIPS:35021
Land Area:1,829 sq mi
Water Area:0 sq mi
Coordinates:35.8611, -104.0590
Quick Link:
https://www.zip-codes.com/county/nm-harding.asp
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New Mexico's fastest-growing county
Population up 17.1% over the past decade.

Standout ZIPs in this County


Most Populous
Roy · 475 people
64.3% of county total
Highest Income
Solano · $102,557 median
1.6× county average
Largest Land Area
Mosquero · 611.5 sq mi
Spans the most ground
Fastest Growth
— growth not calculable
Most Educated
— no education data

Things worth knowing about Harding County


739 residents live across 4 ZIPs covering 1,829 sq mi, served by 4 distinct USPS-recognized cities.

Population moved from 631 to 739 from 2014 to 2024 — a +17.1% change. 3 ZIPs gained residents, 1 lost.

The county's wealthiest ZIP 87746 (Solano, $102,557 median) and poorest ZIP 87743 (Roy, $44,766) are 16.1 miles apart — a 2.3× income gap across local geography.

Median home values vary 3.9× across this county — from $53,300 in 87743 (Roy) to $206,800 in 87746 (Solano).

Density varies across the county — from 0 people/sq mi in 87733 (Mosquero) to 1 in 87743 (Roy).

Educational attainment ranges from 9.9% bachelor's+ in 87746 (Solano) to 32.4% in 87743 (Roy) — the breadth of educational profiles across the area.

Within New Mexico, this is the #34 most populous of 34 counties and ranks #11 for median household income with the #1 fastest decade growth .

Weighted by population, the typical household earns about $56,755 across the county — reflecting what a typical resident sees, not a simple ZIP average.

27.9% of adults age 25+ hold a bachelor's degree or higher (144 of 516 reporting).

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

Stories about Harding 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
1,829
square miles
Avg density
0.4
people per sq mi
Population
739
across 4 ZIPs
Mosquero
611.5 sq mi
70 residents
Roy
539.0 sq mi
475 residents
Solano
355.2 sq mi
134 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.

Roy

All ZIP Codes in Harding County


ZIPCityTypePopulationMedian IncomeArea (sq mi)10-yr Growth
87743RoyStandard475$44,766539.025.7%
87746SolanoStandard134$102,557355.2168.0%
87733MosqueroStandard70611.5-63.2%
87730MillsStandard60$49,375323.7361.5%

Adjacent & Nearby Counties