Tetonia is a city in Teton County, Idaho, United States, about 50 miles northeast of Idaho Falls, Idaho and about 425 miles northwest of Den…Tetonia is a city in Teton County, Idaho, United States, about 50 miles northeast of Idaho Falls, Idaho and about 425 miles northwest of Denver, Colorado. The population was 269 at the 2010 census. According to the United States Census Bureau, the city has a total area of 0.57 square miles, all land. Tetonia is located at 43°48′50″N 111°9′35″W, in Teton County Idaho.
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