Ecuador has the highest population density among South American countries. Its population is concentrated into a relatively small national territory, producing a higher people-per-square-kilometre figure than its continental neighbours.
Ecuador’s geography helps explain the pattern. Most residents live in the coastal lowlands or the Andean highlands, especially around major urban centres such as Guayaquil and Quito. By contrast, the eastern Amazon region covers more than half the country but has comparatively few inhabitants, while the Galápagos Islands have only a small share of the national population.
Ecuador is smaller than Brazil, Argentina, Peru, Colombia, and Bolivia, yet it has a substantial population. That combination raises its overall density. Population density is calculated by dividing total population by land area, so it does not mean that people are evenly spread across the country.
A common mix-up is confusing population density with total population. Brazil and Colombia have more people overall, but Ecuador has more people per square kilometre. The answer can vary slightly with census year and methodology, but Ecuador remains the standard answer for this country-level South American comparison.