Juana Díaz is a municipality of Puerto Rico.

Juana Díaz borders Ponce at the west, Jayuya and Orocovis at the north, Villalba to the north and east, Coamo and Santa Isabel to the east and the Caribbean Sea to the south. The urban zone is centered at close to 18.05°N and 66.5°O.

Several rivers run through the Juana Díaz territory, among them, Inabón River and the Jacaguas River, from which Juana Díaz takes its nickname: "Ciudad del Jacaguas". The Guayabal dam between Juana Díaz and Villalba is located in this river. Among its main tributaries are Toa Vaca River in Villalba, also dammed. Both Guayabal and Toa Vaca lakes are visible in the map. Lake Toa Vaca is also the main source of drinking water for Juana Díaz, Ponce and other towns.

Among the most important roads in Juana Díaz are the Luis A. Ferré Expressway (PR-52) which connects Juana Díaz with Ponce and the airport in just minutes and San Juan in a little more than one hour. Other important roads include road PR-14 which runs through downtown Juana Díaz on its route between Ponce and Cayey, road PR-149 from Juana Díaz to Manatí running through Villalba and the "Cordillera Central" and road PR-1 which goes from Ponce to San Juan through barrio Pastillo in the south coast of Juana Díaz.

Surface area: 61 square miles (158 km²)

Population by barrio or ward:

Ward / 1990 / 2000 / Percent Change

Juana Díaz pueblo / 4,676 / 4,555 / -2.6%

Amuelas / 2,289 / 4,056 / +77.2%

Cayabo / 1,783 / 2,206 / +23.7%

Capitanejo / 5,627 / 5,328 / -5.3%

Cintrona / 2,161 / 2,309 / +6.8%

Collores / 2,207 / 2,161 / -2.1%

Guayabal / 5,859 / 5,774 / -1.4%

Jacaguas / 4,005 / 4,522 / +12.9%

Lomas / 1,803 / 1,358 / -24.7%

Río Cañas Abajo / 2,372 / 2,323 / -2.1%

Río Cañas Arriba / 967 / 2,332 / +141.2%

Sabana Llana / 6,436 / 7,964 / +23.7%

Tijeras / 4,443 / 5,640 / +26.9%

Total / 45,198 / 50,531 / +11.8%

Source: Bureau of Census

Note to people unfamiliar with Puerto Rico's political subdivisions: "Juana Díaz" refers here to what is officially called Municipality of Juana Díaz. All wards listed here are what constitute the municipality itself. Strictly speaking Juana Díaz is just what is called "Juana Díaz pueblo" above although all inhabitants within the municipality are "juanadinos" (name given to people of Juana Díaz). A municipality in Puerto Rico is functionally similar to what are called "counties" in most states of the United States.