Island Park, ID

Island Park sits in the high country of eastern Idaho, just south of the West Yellowstone entrance. Spread along a 33-mile stretch of Highway 20, the community holds the quirky title of having the longest Main Street in America. With fewer than 200 year-round residents, daily life unfolds among dense pine forests, quiet cabin neighborhoods, and wide-open mountain valleys. World-class fly fishing along the Henry's Fork of the Snake River is right outside your door, while nearby spots like Harriman State Park and Henrys Lake offer endless room to hike, boat, and explore.

ATTRMetrodyne at English Wikipedia / Public domain

The town was originally incorporated in 1947 so a collection of scattered lodges along the highway could qualify for state liquor licenses, which explains its unusually long and narrow boundary. Today, that rustic corridor attracts people who want a quiet pace and immediate access to the outdoors. Winters bring deep snowfall and world-famous snowmobile trails, while summers buzz with anglers, boaters, and Yellowstone visitors. Between local landmarks like the historic Railroad Ranch and the crystal-clear waters of Big Springs, Island Park offers a relaxed, nature-first lifestyle with plenty of room to breathe.