Vieques lies about 8 miles (13 km) east of the Puerto Rican mainland, and measures about 20 miles (32 km) long by 4.5 miles (7 km) wide. Its most populated barrio is the town of Isabel Segunda (sometimes written "Isabel II"), the administrative center located on the northern side of the island. The population of Vieques was 8,249 at the 2020 Census.