ZIP Code 82055 in Centennial, WY

A Seasonal Community at 9,000 Feet

Centennial sits at 9,000 feet in Wyoming's Snowy Range, a tiny mountain community where 284 year-round residents share space with seasonal visitors. This isn't a town with sidewalks and shops. It's a collection of mountain homes scattered across 140 square miles of high-altitude terrain along Highway 130.

Seasonal patterns dominate the housing stock. Of 334 total housing units, 160 (48%) sit vacant for seasonal or recreational use. Winter closes Highway 130 over Snowy Range Pass, isolating the community from Laramie to the east. Most seasonal residents arrive in summer. Year-round residents skew older (median age 60.3 years) with high education levels (69.3% hold bachelor's degrees or higher).

Why PO Boxes Are Essential

Every household depends on a PO Box. This is a PO Box Only Zone, meaning there's no alternative mail delivery across the entire territory. The Centennial post office maintains 236 boxes for 153 occupied homes, a ratio of 1.54 boxes per household. That adoption rate comes from seasonal homeowners, ranches, and people who maintain addresses here even when they're somewhere else in winter.

Mail arrives by rural carrier route. Two rural routes cover the territory, delivering to the post office where everyone picks up from their boxes. No carrier drives to individual homes. General Delivery is available for temporary residents and visitors. In a place this remote, the post office isn't just where you get mail. It's where you see your neighbors.

Mountain Character

Street names tell the story of this landscape. Highway 130 runs through the valley. Delivery addresses include Centennial Valley Road, Rainbow Valley Road, and roads named for local creeks: Weber Creek, Northfork, Kelly Creek, Lower Libby Creek. Roads follow natural features because the terrain dictates where you can build. Homes sit on private drives, ranch roads, and Forest Service access routes with names like Old Sawmill Road, Ladder Ranch Road, and Broken Bridge Road.

A few numbered streets (1st, 2nd, 3rd, 4th) and tree-named streets (Pine, Cedar, Elm, Maple) hint at the tiny historic townsite. But most addresses point to isolated properties across the mountains.

Demographics of a Mountain Retreat

This is Wyoming's second-smallest community by population with a PO Box classification. The post office serves ranchers, retirees, seasonal residents, and a handful of year-round families. Median household income sits at $103,828 with median home values of $495,500. These aren't working ranches for the most part. They're mountain retreats.

Mailing to Centennial

All mail goes to PO Boxes. Street addresses don't work for delivery. Use this format:

Recipient Name
PO Box [number]
Centennial, WY 82055

Street Name Patterns

Street names follow natural features like creeks, valleys, and mountains, plus ranch and historic roads across remote terrain.