Jackson County in Wyoming is the wealthiest county per capita in the U.S. (Teton National Park area)

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 https://www.nbcnews.com/news/us-news/landslide-wyoming-deepens-disparities-ultra-wealthy-local-workers-rcna156574

On average, more than 2,500 people commute daily from Idaho to Jackson, which is in the wealthiest county in the United States, per capita, the county housing authority said. It has a median income of more than $108,000, compared to Teton County, Idaho, where the median income is $89,000, according to U.S. Census data.