In this Demography section we present data published by the United States Census Bureau to understand the population aspect of the nine municipalities that make up the San Juan Bay Estuary basin.

The United States Census Bureau is dedicated to collecting and disseminating data on the population, places, and economy of the United States of America and its territories. According to Article I, Section 2 of the United States Constitution, the Bureau must conduct a census of every resident every ten years, although other data is updated more frequently.

The collected information is aggregated according to the official administrative divisions established based on the desired level of detail and geographic scale. In the case of Puerto Rico, some of these official divisions include municipalities, neighborhoods, census tracts, and census blocks, among others.

This administrative division is defined by grouping together small regions with a degree of homogeneity based on population characteristics, economic status, and living conditions. These are contiguous areas where the main criterion for their definition is that the total population fluctuates around 4,000 people.

The map below shows the distribution of the population in the census tracts throughout the region comprising the San Juan Bay Estuary basin.