| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Rabo del Buey | city | Puerto Rico | United States | 18.03694 | -66.24083 | 518 | 26607 |
| Radioville | city | Puerto Rico | United States | 18.47778 | -66.75167 | 82 | 26231 |
| Rafael Arroyo | city | Puerto Rico | United States | 18.36639 | -66.54694 | 721 | 34741 |
| Rafael Capo | city | Puerto Rico | United States | 18.40917 | -66.7825 | 662 | 44222 |
| Rafael Gonzalez | city | Puerto Rico | United States | 18.42944 | -66.78722 | 419 | 41208 |
| Rafael Hernandez | city | Puerto Rico | United States | 18.47333 | -67.07944 | 344 | 48128 |
| Ramon Colon | city | Puerto Rico | United States | 18.31361 | -65.97694 | 396 | 151384 |
| Ramon Nevares | city | Puerto Rico | United States | 18.40056 | -66.06722 | 59 | 381107 |
| Ramon Pabon | city | Puerto Rico | United States | 18.33556 | -66.36944 | 626 | 57455 |
| Ramos | city | Puerto Rico | United States | 18.34167 | -65.71306 | 501 | 35078 |
| Real Abajo | city | Puerto Rico | United States | 18.07944 | -66.56611 | 682 | 73113 |
| Real Anon | city | Puerto Rico | United States | 18.12139 | -66.57306 | 1358 | 67512 |
| Real Arriba | city | Puerto Rico | United States | 18.09778 | -66.56361 | 1049 | 67512 |
| Recio | city | Puerto Rico | United States | 17.97361 | -65.95861 | 0 | 16366 |
| Regadera | city | Puerto Rico | United States | 18.44167 | -66.3325 | 193 | 69716 |
| Reparto Sevilla | city | Puerto Rico | United States | 18.40417 | -66.02028 | 39 | 320351 |
| Reparto Universitario | city | Puerto Rico | United States | 18.39611 | -66.04167 | 127 | 381107 |
| Reunion | city | Puerto Rico | United States | 17.9575 | -66.14306 | 45 | 14244 |
| Rexmanor | city | Puerto Rico | United States | 17.98528 | -66.10389 | 88 | 32036 |
| Rincon | city | Puerto Rico | United States | 18.34222 | -67.25028 | 167 | 13546 |
| Rincon | city | Puerto Rico | United States | 18.05 | -66.54417 | 223 | 73113 |
| Rio | city | Puerto Rico | United States | 18.23 | -65.85917 | 314 | 57388 |
| Rio Abajo | city | Puerto Rico | United States | 18.42556 | -66.38667 | 282 | 62370 |
| Rio Abajo | city | Puerto Rico | United States | 18.15278 | -65.80333 | 22 | 56515 |
| Rio Blanco | city | Puerto Rico | United States | 18.22028 | -65.78889 | 85 | 35484 |
| Rio Canas | city | Puerto Rico | United States | 18.05111 | -66.42667 | 495 | 35739 |
| Rio Canas Abajo | city | Puerto Rico | United States | 18.04028 | -66.46806 | 328 | 35746 |
| Rio Grande | city | Puerto Rico | United States | 18.38222 | -65.83167 | 19 | 34554 |
| Rio Hondo | city | Puerto Rico | United States | 18.21472 | -66.25 | 928 | 54793 |
| Rio Jueyes | city | Puerto Rico | United States | 18.02306 | -66.33333 | 357 | 23449 |
| Rio Lajas | city | Puerto Rico | United States | 18.39667 | -66.26806 | 39 | 108242 |
| Rio Piedras | city | Puerto Rico | United States | 18.39944 | -66.05028 | 95 | 381107 |
| Rivera y Lomas | city | Puerto Rico | United States | 18.32944 | -66.27028 | 557 | 65850 |
| Riverview | city | Puerto Rico | United States | 18.41694 | -66.17333 | 82 | 175932 |
| Robles | city | Puerto Rico | United States | 18.13556 | -66.24889 | 2037 | 50476 |
| Rodriguez Hevia | city | Puerto Rico | United States | 18.19444 | -66.17056 | 1473 | 54863 |
| Rolling Hills | city | Puerto Rico | United States | 18.38194 | -65.98417 | 59 | 227878 |
| Roosevelt | city | Puerto Rico | United States | 18.1975 | -65.96528 | 321 | 62934 |
| Rosa Maria | city | Puerto Rico | United States | 18.38694 | -65.95278 | 39 | 150762 |
| Rosa Sanchez | city | Puerto Rico | United States | 18.06361 | -65.91389 | 265 | 38487 |
| Rosario | city | Puerto Rico | United States | 18.16444 | -67.07944 | 442 | 47673 |
| Royal Gardens | city | Puerto Rico | United States | 18.37806 | -66.17972 | 108 | 225500 |
| Royal Town | city | Puerto Rico | United States | 18.36778 | -66.17222 | 95 | 216045 |
| Rucio | city | Puerto Rico | United States | 18.09389 | -66.69222 | 1469 | 51888 |
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