Ft. McHenry's 15-star and stripe flag of 1814 (in use from 1795-1818)
Now, the flag of the USA has thirteen red and white stripes, representing the original 13 British colonies, and fifty stars, representing the 50 states of the union.
The Grand Union Flag was used from December 1775 to June 1777, incorporating the thirteen stripes for the 13 colonies and the British Union Jack.
Later there were several versions of the flag with thirteen red and white stripes and thirteen stars on a the latter either on a blue field in rows or in a circle.
Often called the Betsy Ross Flag
There have been many, many U.S. flags over the years. Then I got to wondering where the Maryland State Flag came from, as it has a quite unique design. Turns out it is based on the heraldic arms of the founding family of the colony of Maryland, the Calverts, Barons Baltimore, incorporating the arms of the Crossland family as well. According to Wikipedia, it is the only state flag that is based on English heraldry.
However, the Flag of the District of Columbia, is based on the family crest of the Washington family of County Durham, England, originating in the 12th century.
District of Columbia Flag, adopted in 1938
Below the arms of the Washington Family, in a 14th C. window of the Selby Abbey in Yorkshire.