| ZIP Codes: | 12 ZIP Codes (9 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Code: | 701 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 2:13:03 PM |
| Population: | 39,903 [See All] |
| FIPS: | 38105 |
| CBSA: | Williston, ND |
| Land Area: | 2,770 sq mi |
| Water Area: | 81 sq mi |
| Coordinates: | 48.3874, -103.4606 |
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39,903 residents live across 12 ZIPs covering 2,770 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 27,573 to 39,903 from 2014 to 2024 — a +44.7% change. 7 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 58843 (Epping, $118,750 median) and poorest ZIP 58852 (Tioga, $80,595) are 21.3 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.4× across this county — from $149,100 in 58795 (Wildrose) to $362,500 in 58843 (Epping).
Density varies 759× across the county — from 1 people/sq mi in 58856 (Zahl) to 683 in 58853 (Trenton).
Educational attainment ranges from 16.2% bachelor's+ in 58849 (Ray) to 39.6% in 58795 (Wildrose) — the breadth of educational profiles across the area.
Within North Dakota, this is the #5 most populous of 64 counties and ranks #6 for median household income with the #3 fastest decade growth .
On the national stage, Williams County is and #19 for decade growth .
Weighted by population, the typical household earns about $85,880 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.5% of adults age 25+ hold a bachelor's degree or higher (6,066 of 24,752 reporting).
9 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
Williams County grew 44.7% over the past decade — concentrated in 2 high-growth ZIPs:
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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 58801 | Williston | Standard | 34,277 | $84,702 | 743.3 | 49.0% |
| 58852 | Tioga | Standard | 2,087 | $80,595 | 328.9 | 28.6% |
| 58849 | Ray | Standard | 1,101 | $82,250 | 306.7 | -1.1% |
| 58843 | Epping | Standard | 676 | $118,750 | 238.8 | 69.4% |
| 58845 | Grenora | Standard | 584 | $91,806 | 317.1 | 78.6% |
| 58795 | Wildrose | Standard | 414 | $117,344 | 178.9 | 152.4% |
| 58853 | Trenton | PO Box | 354 | $107,969 | 0.5 | -7.8% |
| 58856 | Zahl | Standard | 211 | $104,688 | 234.5 | 9.9% |
| 58755 | Mcgregor | Standard | 133 | $138,705 | 97.4 | 46.2% |
| 58830 | Alamo | Standard | 66 | $54,063 | 323.6 | -75.6% |
| 58802 | Williston | PO Box | — | — | 0.0 | — |
| 58803 | Williston | PO Box | — | — | 0.0 | — |