| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Lares Municipio | 1 | 14.23% | 27,099 | 23,723 |
| Rincón Municipio | 2 | 14.13% | 15,477 | 13,561 |
| Aibonito Municipio | 3 | 11.32% | 24,317 | 21,844 |
| San Sebastián Municipio | 4 | 9.17% | 38,177 | 34,970 |
| Las Marías Municipio | 5 | 8.89% | 8,417 | 7,730 |
| Naranjito Municipio | 6 | 6.9% | 29,033 | 27,159 |
| Moca Municipio | 7 | 6.11% | 36,712 | 34,597 |
| Camuy Municipio | 8 | 5.99% | 32,074 | 30,261 |
| Vega Baja Municipio | 9 | 5.84% | 52,226 | 49,342 |
| Corozal Municipio | 10 | 5.3% | 33,736 | 32,037 |
| Bayamón Municipio | 11 | 5.2% | 175,156 | 166,499 |
| Guaynabo Municipio | 12 | 5.16% | 87,133 | 82,858 |
| Aguadilla Municipio | 13 | 4.96% | 52,096 | 49,632 |
| Isabela Municipio | 14 | 4.85% | 42,160 | 40,208 |
| Barranquitas Municipio | 15 | 4.22% | 28,727 | 27,565 |
| Ciales Municipio | 16 | 4.03% | 16,248 | 15,618 |
| Fajardo Municipio | 17 | 3.81% | 29,979 | 28,879 |
| Orocovis Municipio | 18 | 3.42% | 20,723 | 20,038 |
| Trujillo Alto Municipio | 19 | 3.18% | 64,969 | 62,969 |
| Arecibo Municipio | 20 | 2.81% | 83,369 | 81,090 |
| Lajas Municipio | 21 | 2.71% | 22,264 | 21,677 |
| San Juan Municipio | 22 | 2.34% | 320,283 | 312,975 |
| San Lorenzo Municipio | 23 | 2.19% | 36,447 | 35,667 |
| Adjuntas Municipio | 24 | 1.99% | 17,556 | 17,213 |
| Manatí Municipio | 25 | 1.91% | 37,509 | 36,806 |
| Jayuya Municipio | 26 | 1.88% | 13,969 | 13,711 |
| Culebra Municipio | 27 | 1.63% | 1,748 | 1,720 |
| Cidra Municipio | 28 | 1.37% | 38,535 | 38,015 |
| Juana Díaz Municipio | 29 | 1.27% | 44,874 | 44,312 |
| San Germán Municipio | 30 | 0.74% | 30,016 | 29,796 |
| Aguada Municipio | 31 | 0.66% | 36,583 | 36,343 |
| Sabana Grande Municipio | 32 | 0.41% | 21,544 | 21,455 |
| Florida Municipio | 33 | 0.39% | 11,273 | 11,229 |
| Carolina Municipio | 34 | 0.36% | 145,487 | 144,958 |
| Quebradillas Municipio | 35 | -0.21% | 22,684 | 22,732 |
| Peñuelas Municipio | 36 | -1.08% | 18,623 | 18,827 |
| Caguas Municipio | 37 | -2.17% | 120,738 | 123,421 |
| Comerío Municipio | 38 | -2.27% | 18,129 | 18,551 |
| Dorado Municipio | 39 | -2.65% | 35,141 | 36,096 |
| Hormigueros Municipio | 40 | -3.23% | 14,925 | 15,423 |
| Cabo Rojo Municipio | 41 | -3.44% | 45,724 | 47,352 |
| Utuado Municipio | 42 | -3.56% | 26,053 | 27,014 |
| Villalba Municipio | 43 | -3.6% | 20,324 | 21,082 |
| Maunabo Municipio | 44 | -3.62% | 9,858 | 10,228 |
| Ceiba Municipio | 45 | -3.64% | 10,289 | 10,678 |
| Luquillo Municipio | 46 | -3.85% | 16,822 | 17,495 |
| Ponce Municipio | 47 | -4.38% | 123,209 | 128,858 |
| Humacao Municipio | 48 | -4.52% | 47,903 | 50,170 |
| Hatillo Municipio | 49 | -5.26% | 37,077 | 39,135 |
| Juncos Municipio | 50 | -5.97% | 35,887 | 38,165 |
| Mayagüez Municipio | 51 | -6.02% | 66,027 | 70,259 |
| Toa Baja Municipio | 52 | -6.52% | 68,349 | 73,113 |
| Vega Alta Municipio | 53 | -6.54% | 33,517 | 35,863 |
| Yauco Municipio | 54 | -7.11% | 30,551 | 32,888 |
| Vieques Municipio | 55 | -7.29% | 7,725 | 8,332 |
| Cayey Municipio | 56 | -7.62% | 38,952 | 42,165 |
| Barceloneta Municipio | 57 | -8.04% | 21,846 | 23,756 |
| Añasco Municipio | 58 | -8.18% | 23,888 | 26,016 |
| Cataño Municipio | 59 | -8.2% | 20,919 | 22,788 |
| Río Grande Municipio | 60 | -8.37% | 43,762 | 47,762 |
| Las Piedras Municipio | 61 | -8.5% | 33,894 | 37,043 |
| Guayanilla Municipio | 62 | -8.51% | 15,882 | 17,360 |
| Patillas Municipio | 63 | -9.14% | 14,569 | 16,035 |
| Aguas Buenas Municipio | 64 | -9.82% | 22,183 | 24,598 |
| Canóvanas Municipio | 65 | -9.86% | 40,206 | 44,604 |
| Morovis Municipio | 66 | -10.15% | 27,259 | 30,340 |
| Santa Isabel Municipio | 67 | -10.32% | 18,945 | 21,126 |
| Toa Alta Municipio | 68 | -11.14% | 64,172 | 72,215 |
| Salinas Municipio | 69 | -12.96% | 23,452 | 26,945 |
| Loíza Municipio | 70 | -13.79% | 20,824 | 24,154 |
| Naguabo Municipio | 71 | -14.86% | 22,015 | 25,858 |
| Yabucoa Municipio | 72 | -14.94% | 27,147 | 31,916 |
| Coamo Municipio | 73 | -16.09% | 32,242 | 38,424 |
| Guayama Municipio | 74 | -16.38% | 32,709 | 39,114 |
| Arroyo Municipio | 75 | -16.93% | 14,197 | 17,091 |
| Gurabo Municipio | 76 | -18.3% | 38,782 | 47,469 |
| Maricao Municipio | 77 | -22.16% | 4,194 | 5,388 |
| Guánica Municipio | 78 | -25.5% | 11,203 | 15,037 |
Puerto Rico's counties show varied growth patterns from 2020 to 2026. Lares Municipio leads with 2.24% annualized growth, followed by Rincón Municipio (2.23%) and Aibonito Municipio (1.8%). The largest counties are San Juan Municipio (320,283), Bayamón Municipio (175,156), and Carolina Municipio (145,487). Of the 78 counties in Puerto Rico, 34 are growing while 44 have experienced population decline. Overall, counties averaged -0.54% annualized growth, with total population growing by -0.32% annually.
-0.05
-0.025
0
0.025
0.05
0.075