Oella is a mill town on the Patapsco River in western Baltimore County, Maryland, United States, located between Catonsville and Ellicott City. It is a 19th-century village of millworkers' homes. Oella was founded in 1808 by the Union Manufacturing Company as a working class community for the company's mill workers. It was one of the earliest and most extensiv…Oella is a mill town on the Patapsco River in western Baltimore County, Maryland, United States, located between Catonsville and Ellicott City. It is a 19th-century village of millworkers' homes. Oella was founded in 1808 by the Union Manufacturing Company as a working class community for the company's mill workers. It was one of the earliest and most extensive cotton factories in the United States and used water-powered looms as early as 1819.
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