Blue Ash is a city in Hamilton County, Ohio. An inner suburb of Cincinnati, the population was 13,394 at the time of the 2020 census. The area t…Blue Ash is a city in Hamilton County, Ohio. An inner suburb of Cincinnati, the population was 13,394 at the time of the 2020 census. The area that is now Blue Ash was settled around 1791. In 1797, the first settlers built Carpenter's Run Baptist Church out of blue ash logs, giving the area its eventual name.
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