Chester is an unincorporated community in Fremont County, Idaho, United States. Chester is located on U.S. Route 20, northeast of St. Anthony. Chester has a post office with ZIP code 83421.ZIP Code Lookup

History Chester's population was estimated at 250 in 1909, and was 100 in 1960.

Climate According to the Köppen climate classification, Chester has a warm-summer humid continental climate (Köppen climate classification: Dfb).

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