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Population Review

Census ACS · 78 counties

Largest Counties in Puerto Rico

Puerto Rico has 78 counties with Census data available. The largest is San Juan Municipio with a population of 338,661. County-level data is important because counties are the primary unit of local government in most states, responsible for courts, elections, public health, and infrastructure. Population distribution across counties reveals where growth is concentrated and where rural decline may be occurring.

Source: Census ACS 5-Year Estimates

#CountyPopulationMedian Income
1Yauco Municipio33,509$21,918
2Yabucoa Municipio29,868$21,279
3Villalba Municipio21,778$24,882
4Vieques Municipio8,147$17,531
5Vega Baja Municipio54,058$23,877
6Vega Alta Municipio35,114$25,235
7Utuado Municipio27,896$17,624
8Trujillo Alto Municipio67,329$38,773
9Toa Baja Municipio73,987$29,648
10Toa Alta Municipio66,536$33,349
11Santa Isabel Municipio20,064$23,197
12San Sebastián Municipio39,168$17,834
13San Lorenzo Municipio37,515$21,320
14San Juan Municipio338,661$26,981
15San Germán Municipio31,514$17,921
16Salinas Municipio25,397$21,611
17Sabana Grande Municipio22,541$20,564
18Río Grande Municipio46,478$26,745
19Rincón Municipio15,276$25,223
20Quebradillas Municipio23,486$23,624
21Ponce Municipio134,676$18,827
22Peñuelas Municipio20,082$20,959
23Patillas Municipio15,753$23,422
24Orocovis Municipio21,351$19,062
25Naranjito Municipio29,246$21,399
26Naguabo Municipio23,205$21,416
27Morovis Municipio28,534$23,010
28Moca Municipio37,402$21,415
29Mayagüez Municipio71,824$17,963
30Maunabo Municipio10,482$19,363
31Maricao Municipio5,176$20,541
32Manatí Municipio39,152$20,352
33Luquillo Municipio17,631$23,769
34Loíza Municipio23,176$22,500
35Las Piedras Municipio35,034$25,697
36Las Marías Municipio8,790$16,170
37Lares Municipio27,944$19,323
38Lajas Municipio23,133$18,920
39Juncos Municipio36,895$28,196
40Juana Díaz Municipio46,276$23,823
41Jayuya Municipio14,653$18,413
42Isabela Municipio42,878$20,484
43Humacao Municipio50,441$26,083
44Hormigueros Municipio15,520$24,862
45Hatillo Municipio38,266$28,001
46Gurabo Municipio40,383$39,532
47Guaynabo Municipio89,503$46,048
48Guayanilla Municipio17,418$21,400
49Guayama Municipio35,845$20,273
50Guánica Municipio13,266$16,210
51Florida Municipio11,624$21,213
52Fajardo Municipio31,756$25,170
53Dorado Municipio35,816$33,388
54Culebra Municipio1,281$27,614
55Corozal Municipio34,474$23,933
56Comerío Municipio18,775$17,254
57Coamo Municipio34,294$20,797
58Cidra Municipio39,765$27,149
59Ciales Municipio16,874$20,614
60Ceiba Municipio11,128$23,204
61Cayey Municipio41,231$28,461
62Cataño Municipio22,768$24,307
63Carolina Municipio153,226$35,126
64Canóvanas Municipio42,037$27,278
65Camuy Municipio32,753$26,094
66Caguas Municipio126,239$30,113
67Cabo Rojo Municipio46,955$25,720
68Bayamón Municipio183,456$30,729
69Barranquitas Municipio28,984$22,167
70Barceloneta Municipio22,565$21,750
71Arroyo Municipio15,573$18,931
72Arecibo Municipio86,875$23,175
73Añasco Municipio25,316$23,591
74Aibonito Municipio24,610$21,714
75Aguas Buenas Municipio23,888$22,361
76Aguadilla Municipio54,486$19,826
77Aguada Municipio37,904$21,694
78Adjuntas Municipio17,975$18,605

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Frequently Asked Questions

San Juan Municipio is the #1 ranked county in Puerto Rico by population, with a value of 338,661 according to latest Census ACS data.

Puerto Rico has 78 counties tracked in latest Census ACS data.

All data comes from the American Community Survey (ACS) 5-Year estimates by the US Census Bureau.

Data from the American Community Survey 5-Year estimates. Covers all counties in Puerto Rico.

Source: U.S. Census Bureau ACS, 2026.