He was born in Charlottetown, the son of Francis Longworth, and educated there. Longworth studied law with Robert Hodgson, was admitted as an attorney to the Supreme Court of Prince Edward Island and set up practice as a lawyer and notary public in Charlottetown. In 1847, he married Elizabeth White Tremaine. Longworth served as a deputy judge in the colony's vice admiralty court. He was a founding director of the Bank of Prince Edward Island, later serving as its president, and was also agent for a number of insurance firms. Longworth served as a member of the colony's Executive Council from 1859 to 1867. He opposed Confederation and supported free trade with the United States. In 1863, he was named Queen's Counsel. Longworth was named to the Charlottetown Board of School Trustees in 1878. He died in Charlottetown in 1885.
His brother Francis served in the provincial assembly.
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