| Official Name: | Duey Alto |
| Settlement Type: | Barrio |
| Pushpin Map: | Caribbean |
| Pushpin Map Caption: | Location of Puerto Rico |
| Coordinates: | 18.1328°N -67.064°W |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Commonwealth |
| Subdivision Name: |  Puerto Rico |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | San Germán |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 2.02 |
| Area Land Sq Mi: | 2.02 |
| Area Water Sq Mi: | 0 |
| Population As Of: | 2010 |
| Population Note: | Source: 2010 Census |
| Population Total: | 1350 |
| Population Density Sq Mi: | 668.3 |
| Timezone: | AST |
| Utc Offset: | -4 |
| Elevation Ft: | 220 |
| Postal Code Type: | ZIP Code |
Duey Alto is a barrio in the municipality of San Germán, Puerto Rico. Its population in 2010 was 1,350.[2] [3] [4]
Duey Alto was in Spain's gazetteers[5] until Puerto Rico was ceded by Spain in the aftermath of the Spanish–American War under the terms of the Treaty of Paris of 1898 and became an unincorporated territory of the United States. In 1899, the United States Department of War conducted a census of Puerto Rico finding that the combined population of Duey Alto and Rosario Peñón barrios was 1,100.[6]