Wiltshire, England and settled in the Province of Pennsylvania.

In 1760, Mifflin graduated from the College of Philadelphia (now the University of Pennsylvania) and joined the mercantile business of William Biddle. After returning from a trip to Europe in 1765, he established a commercial business partnership with his brother, George Mifflin.

He married a second cousin, Sarah Morris, on March 4, 1767. Their daughter married Joseph Hopkinson,

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