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By population it is Los Angeles County, California (10 million +) and by area it is San Bernardino County, California (21,000 square miles).
The largest "county equivalent" by area is Yukon-Koyukuk Census Area in Alaska (147,805 square miles). It is part of Alaska's Unorganized Borough and has no county seat. Its population is less than 6000.
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By population it is Los Angeles County, California (10 million +) and by area it is San Bernardino County, California (21,000 square miles).
The largest "county equivalent" by area is Yukon-Koyukuk Census Area in Alaska (147,805 square miles). It is part of Alaska's Unorganized Borough and has no county seat. Its population is less than 6000.
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