Like each of the 78 Municipalities of Puerto Rico, the capital of Puerto Rico, San Juan, Puerto Rico, is subdivided into barrios or in English wards, 18 in number, 8 of which are further subdivided into a total of 72 sub-barrios:
- Caimito
- Cupey
- El Cinco
- Gobernador Piñero
- Hato Rey Central (4 sub-barrios)
- Hato Rey Norte (4 sub-barrios)
- Hato Rey Sur (4 sub-barrios)
- Monacillo
- Monacillo Urbano
- Oriente (3 sub-barrios)
- Pueblo (6 sub-barrios)
- Quebrada Arenas
- Sabana Llana Norte
- Sabana Llana Sur
- San Juan Antiguo (7 sub-barrios)
- Santurce (40 sub-barrios)
- Tortugo
- Universidad (4 sub-barrios)
Barrios of San JuanOn the lowest level of territorial subdivision, each barrio is subdivided into