What is the largest county in Puerto Rico?
San Juan Municipio is the largest county in Puerto Rico with a population of 338,661, according to Census ACS 5-Year.
Context
Puerto Rico has 78 counties.
Top 10
| San Juan Municipio | 338,661 |
| Bayamón Municipio | 183,456 |
| Carolina Municipio | 153,226 |
| Ponce Municipio | 134,676 |
| Caguas Municipio | 126,239 |
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Frequently Asked Questions
San Juan Municipio is the largest county in Puerto Rico with a population of 338,661, according to Census ACS 5-Year.
Source: U.S. Census Bureau ACS, 2026.