| ZIP Codes: | 8 ZIP Codes (8 Standard, 0 PO Box, 0 Unique) [See All] |
| Area Code: | 575 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 11:54:31 PM |
| Population: | 4,188 [See All] |
| FIPS: | 35059 |
| Land Area: | 4,190 sq mi |
| Water Area: | 6 sq mi |
| Coordinates: | 36.4561, -103.5339 |
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4,188 residents live across 8 ZIPs covering 4,190 sq mi, served by 8 distinct USPS-recognized cities.
Population moved from 4,444 to 4,188 from 2014 to 2024 — a -5.8% change. 5 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 88419 (Folsom, $96,250 median) and poorest ZIP 88415 (Clayton, $44,952) are 31.7 miles apart — a 2.1× income gap across local geography.
Median home values vary 2.2× across this county — from $116,300 in 88422 (Gladstone) to $252,100 in 88419 (Folsom).
Density varies 27× across the county — from 0 people/sq mi in 88424 (Grenville) to 3 in 88414 (Capulin).
Educational attainment ranges from 15.2% bachelor's+ in 88424 (Grenville) to 55.7% in 88419 (Folsom) — the breadth of educational profiles across the area.
Within New Mexico, this is the #30 most populous of 34 counties and ranks #13 for median household income .
Weighted by population, the typical household earns about $50,606 across the county — reflecting what a typical resident sees, not a simple ZIP average.
18.9% of adults age 25+ hold a bachelor's degree or higher (582 of 3,085 reporting).
8 Standard delivery, 0 PO Box only, 0 single-entity Unique ZIPs serve this county.
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.
One ZIP holds the majority of this county's population — a sign of a county built around a single city or town.
Union County lost 5.8% of residents between 2014 and 2024. ZIPs that shed the largest share:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 88415 | Clayton | Standard | 3,178 | $44,952 | 1,286.9 | -10.8% |
| 88418 | Des Moines | Standard | 536 | $77,813 | 693.0 | 61.9% |
| 88414 | Capulin | Standard | 137 | — | 51.3 | 77.9% |
| 88422 | Gladstone | Standard | 117 | $61,346 | 266.4 | 36.0% |
| 88424 | Grenville | Standard | 89 | — | 909.5 | 48.3% |
| 88419 | Folsom | Standard | 61 | $96,250 | 521.8 | -69.2% |
| 88410 | Amistad | Standard | 45 | $36,042 | 327.4 | 80.0% |
| 88436 | Sedan | Standard | 25 | — | 134.2 | -75.7% |