Ione is a city in Amador County, California. As of the 2020 census the population is 5,141, which is a 35.1% decrease from the 2010 censu…Ione is a city in Amador County, California. As of the 2020 census the population is 5,141, which is a 35.1% decrease from the 2010 census. Once known as "Bedbug" and "Freeze Out," Ione was an important supply center on the main road to the Mother Lode and Southern Mines during the California Gold Rush.
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