Many counties went decades without a flag, until a certain event, such as a local sesquicentennial or the American bicentennial, spurred the creation of a flag.
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Several Maryland county flags, such as Calvert County, Baltimore County, and Anne Arundel County, incorporate the coat of arms of the Calvert family in their designs, due to the design being featured in the Maryland state flag, and the Calvert family's prominence in Maryland history.
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