Duey is a barrio in the municipality of Yauco, Puerto Rico. According to the 2010 Census, it had a population of 1,108 inhabitants and a population density of 129.21 people per km². Duey is located at the coordinates 18°5′36″N 66°50′23″W. According to the United States Census Bureau, Duey has a total area of 8.58 km², of which 8.56 km² is land and 0.0…Duey is a barrio in the municipality of Yauco, Puerto Rico. According to the 2010 Census, it had a population of 1,108 inhabitants and a population density of 129.21 people per km². Duey is located at the coordinates 18°5′36″N 66°50′23″W. According to the United States Census Bureau, Duey has a total area of 8.58 km², of which 8.56 km² is land and 0.02 km² is water.