Last Updated: August 2, 2026
St. Augustine is called the Nation’s Oldest City, and the claim holds up with one careful qualification. Founded in 1565 by the Spanish admiral Pedro Menéndez de Avilés, it is the oldest continuously inhabited European-established settlement in the mainland United States. San Juan, Puerto Rico is older still, founded in 1521. Either way, St. Augustine was already two generations old when the English landed at Jamestown. Spain ceded Florida to the United States under the Adams-Onís Treaty, signed in 1819 and taking effect in 1821; St. Augustine served as capital of the Florida Territory until 1824, when the seat of government moved to Tallahassee — chosen, sensibly enough, as the midpoint between here and Pensacola.
