| Official Name: | Guayo |
| Settlement Type: | Barrio |
| Pushpin Map: | Caribbean |
| Pushpin Map Caption: | Location of Puerto Rico |
| Coordinates: | 18.1786°N -66.8217°W |
| Coordinates Footnotes: | [1] |
| Subdivision Type: | Commonwealth |
| Subdivision Name: |  Puerto Rico |
| Subdivision Type1: | Municipality |
| Subdivision Name1: | Adjuntas |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 2.97 |
| Area Land Sq Mi: | 2.87 |
| Area Water Sq Mi: | 0.1 |
| Population As Of: | 2010 |
| Population Note: | Source: 2010 Census |
| Population Total: | 853 |
| Population Density Sq Mi: | 297.2 |
| Elevation Ft: | 1709 |
| Timezone1: | AST |
| Utc Offset1: | -4 |
| Postal Code Type: | ZIP Codes |
| Postal Code: | 00601, 00631 |
| Area Code: | 787/939 |
Guayo is a rural barrio in the municipality of Adjuntas, Puerto Rico.[2] [3] [4]
Guayo 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 Guayo barrio and Vega Abajo barrio was 1,275.[6]
Since 2001 when law 1-2001 was passed,[7] measures have been taken to identify and address the high levels of poverty and the lack of resources and opportunities affecting specific communities in Puerto Rico. Initially there were 686 places that made the list.[8] By 2008, there were 742 places on the list of Spanish; Castilian: Comunidades especiales de Puerto Rico. The places on the list are barrios, communities, sectors, or neighborhoods and Guayo was one of the seven areas in Adjuntas which made the list.[8]