Challis is the largest city in Custer County, Idaho, United States. It is the county seat and its population was 1,081 at the 2010 census. The 20…Challis is the largest city in Custer County, Idaho, United States. It is the county seat and its population was 1,081 at the 2010 census. The 2020 census showed 902 residents, a 16.6% drop. And as of 2023, the population increased to 924.
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