Most Densely Populated Cities in Puerto Rico: Ranked by People per Square Mile

The densest city in Puerto Rico in our data is San Isidro, PR, with about 12,409 people per square mile, followed by Levittown, PR (10,945) and Río Grande, PR (9,034). This list ranks the top 50 places among the 56 Puerto Rico communities with at least 5,000 residents.

What are the top 50 in Puerto Rico?

How dense are the cities in Puerto Rico?

The densest place is about 2 times as dense as the median place in the state, which has about 5,394 people per square mile. At the other end, Arecibo, PR has about 2,525. Under our scale, 35 places are an urban core (over 5,000 per square mile), 21 are suburban, and the rest are small towns or rural. Toa Baja Municipio contributes 3 of the top 50.

Which counties do the top 50 belong to?

The 50 places on this list are spread across 45 counties of Puerto Rico. Toa Baja Municipio has 3 (Levittown, Sabana Seca, Candelaria); Canóvanas Municipio has 2 (San Isidro, Canóvanas); Cabo Rojo Municipio has 2 (Puerto Real, Cabo Rojo). Counties with several entries are usually centers of a metropolitan area, where one large city is surrounded by many suburbs that each pass the 5,000-resident threshold.

How does Puerto Rico compare with the rest of the country?

The median Puerto Rico place with a page has about 9,444 residents, compared with about 13,459 nationwide, so the state's typical community is smaller than the national typical place. The state has 243 communities in total, of which 56 reach 5,000 residents. See the national ranking of the largest cities for comparison.

Quick answers about Puerto Rico cities

• Which is the densest city in Puerto Rico? San Isidro (12,409 per square mile).
• How many Puerto Rico cities have more than 100,000 people? 4 in our data.
• How many have 25,000 to 100,000? 6.
• What is the typical size? About 9,444 residents for a place with a page.

How is this ranking made?

The data comes from the SimpleMaps US Cities Database, which gives each place an estimated population and a density in people per square kilometer. We convert density to people per square mile and rank the places with at least 5,000 residents. Boundaries matter: a city that includes large parks or farmland scores lower on density than a compact city of the same size, and population estimates can include areas that share a city's ZIP codes. Read why population figures differ and how density is calculated before you quote a number.

Where to go next

Rankings use dataset estimates, not official counts.