Teton County, WY, is the Richest County in the Nation Teton County, Wyoming, home to Jackson Hole Mountain Resort is the richest county in the nation, according to 2019 data from IRS tax returns. The average pre-return adjusted gross income (AGI) is $312,442, not only is that the highest AGI in the nation but also the first time a county’s AGI surpassed $300,000. Related: Jackson, WY Has The Largest Income Gap […] Industry News Aunika Skogen | January 18, 2022 1 Comment