Isabela has a population of 12,505, making it the 24th largest place we list in Puerto Rico.
Isabela holds 0.39% of Puerto Rico's 3,222,688 people. San Juan, the largest place we list there, is 33 times its size. The World Gazetteer published 12,505 for Isabela in 2005 and GeoNames still carries that same figure, so there is no measured change to report.
The 2005 figure comes from the World Gazetteer archive restored on this site. Why figures differ.
Nearby in size
| Place | Region | Population |
|---|---|---|
| Aguadilla | Aguadilla | 16,073 |
| Río Grande | Río Grande | 13,467 |
| Dorado | Dorado | 13,117 |
| San Germán | San Germán | 12,055 |
| Vega Alta | Vega Alta | 12,036 |
| Coamo | Coamo | 11,940 |
Figures are the latest available in GeoNames (CC BY 4.0), which draws on national censuses of varying dates — treat them as recent, not same-year. Country totals are UN World Population Prospects 2024 (medium variant) where the UN lists the country separately; the handful it reports under a parent state keep a GeoNames figure and are marked as such. Sources & method.