Arroyo Municipio area

Population and density of Arroyo Municipio

The Census Bureau estimates that 14,744 people lived in Arroyo Municipio on July 1, 2025. That ranks #2,178 of 3,222 county equivalents nationally and #69 of 78 in Puerto Rico. Since the April 1, 2020 estimates base of 15,842, the population has declined by 1,098 (−6.9%), compared with −3.1% for Puerto Rico as a whole.

With 15 square miles of land, that is 981 people per square mile (379 per km²), placing Arroyo Municipio #194 nationally for density and #29 in Puerto Rico. The median county equivalent has 47 people per square mile; the Puerto Rico median is 754. Put another way, there are about 0.653 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Arroyo Municipio

Puerto Rico has no incorporated places below the municipio: Arroyo Municipio is itself the local government. The Census Bureau describes the settlements inside it, such as zonas urbanas and comunidades, as statistical places, and publishes no separate annual estimates for them.

Metropolitan area

Arroyo Municipio is a central county of the Guayama, PR Metropolitan Statistical Area. Its 3 county equivalents have 63,864 residents on 126.6 square miles of land; Arroyo Municipio accounts for 11.9% of the land and 23.1% of the residents. By combined land it ranks #393 of 393 metropolitan areas, and #389 by population. It belongs to the San Juan-Bayamón, PR Combined Statistical Area.

ZIP codes

2 ZIP Code Tabulation Areas have land in Arroyo Municipio; 1 of them have most of their land inside the county, and the others mainly cover neighboring areas.

0071400723

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Arroyo Municipio

Arroyo Municipio shares a land border with 2 county equivalents. Each of them has more land than Arroyo Municipio. The largest neighbor is Guayama Municipio (65 mi²) and the smallest is Patillas Municipio (46.6 mi²). Together with its neighbors, Arroyo Municipio forms a block of 126.6 mi² of land, of which it holds 11.9%.

How big is Arroyo Municipio compared with U.S. states?

Arroyo Municipio has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 69 times as much. Puerto Rico’s county land could hold about 228 areas the size of Arroyo Municipio.

Another way to picture it: the same land area would fill a square about 3.88 miles (6.2 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Arroyo Municipio?

Arroyo Municipio has more land than 28 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Arroyo Municipio at #3,176 nationally by total area, 18 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 57.9%, compared with a national county-equivalent median of 1.2% — 56.7 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Arroyo Municipio in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.