| ZIP Codes: | 14 ZIP Codes (9 Standard, 5 PO Box, 0 Unique) [See All] |
| Area Code: | 307 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:14:25 PM |
| Population: | 79,937 [See All] |
| FIPS: | 56025 |
| CBSA: | Casper, WY |
| Land Area: | 5,344 sq mi |
| Water Area: | 25 sq mi |
| Coordinates: | 43.0061, -106.5902 |
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79,937 residents live across 14 ZIPs covering 5,344 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 78,613 to 79,937 from 2014 to 2024 — a +1.7% change. 6 ZIPs gained residents, 5 lost (and 1 held flat).
The county's wealthiest ZIP 82636 (Evansville, $86,638 median) and poorest ZIP 82644 (Mills, $53,750) are 14.1 miles apart — a 1.6× income gap across local geography.
Median home values vary 1.7× across this county — from $175,900 in 82644 (Mills) to $299,300 in 82636 (Evansville).
Density varies 134× across the county — from 15 people/sq mi in 82604 (Casper) to 2,027 in 82644 (Mills).
Most of the decade's growth concentrated around Casper — top growth ZIPs averaged +15.9% over the past ten years ( 82644 , 82609 and 82604 ).
Educational attainment ranges from 12.9% bachelor's+ in 82644 (Mills) to 32.1% in 82609 (Casper) — the breadth of educational profiles across the area.
Within Wyoming, this is the #2 most populous of 28 counties and ranks #21 for median household income .
Weighted by population, the typical household earns about $73,043 across the county — reflecting what a typical resident sees, not a simple ZIP average.
27.6% of adults age 25+ hold a bachelor's degree or higher (15,136 of 54,820 reporting). The most-educated ZIPs cluster around Casper.
9 Standard delivery, 5 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.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 82604 | Casper | Standard | 27,487 | $79,118 | 1,814.9 | 3.9% |
| 82601 | Casper | Standard | 26,721 | $67,642 | 801.1 | -4.1% |
| 82609 | Casper | Standard | 18,714 | $71,010 | 195.5 | 8.3% |
| 82636 | Evansville | Standard | 4,259 | $86,638 | 132.4 | 3.6% |
| 82644 | Mills | PO Box | 2,098 | $53,750 | 1.0 | 35.4% |
| 82643 | Midwest | Standard | 267 | $77,800 | 208.7 | -55.9% |
| 82620 | Alcova | Standard | 164 | — | 1,088.7 | -32.5% |
| 82638 | Hiland | Standard | 116 | — | 377.1 | — |
| 82635 | Edgerton | PO Box | 87 | $34,886 | 44.3 | -78.3% |
| 82648 | Powder River | PO Box | 24 | — | 103.9 | 84.6% |
| 82630 | Arminto | Standard | 0 | — | 391.3 | -100.0% |
| 82646 | Natrona | Standard | 0 | — | 185.2 | — |
| 82605 | Casper | PO Box | — | — | 0.0 | — |
| 82602 | Casper | PO Box | — | — | 0.0 | — |