The map above shows Guam and Puerto Rico side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Guam vs Puerto Rico Geography
Land area: Guam has a land area of 210 square miles (544 km²), while Puerto Rico has 3,424 square miles (8,868 km²). Puerto Rico's land area is 16.3 times larger than Guam's.
Total area: Guam: 210 square miles (544 km²) vs Puerto Rico: 3,515 square miles (9,104 km²), including inland and coastal water. Puerto Rico's total area is 16.7 times larger than Guam's.
Length: Guam is 27 miles (43 km) long from north to south; Puerto Rico is 67 miles (107 km). Puerto Rico's north-south length is 2.5 times (148%) longer than Guam's.
Width: Guam spans 22 miles (35 km) east to west; Puerto Rico spans 174 miles (279 km). Puerto Rico's east-west width is 7.9 times (691%) wider than Guam's.
Highest point: Guam's highest point is Mount Lamlam at 1,332 feet (406 m); Puerto Rico's is Cerro de Punta at 4,390 feet (1,338 m). Cerro de Punta is 3,058 feet higher than Mount Lamlam.
Lowest point: Guam's lowest point is Pacific Ocean at 0 feet; Puerto Rico's is Atlantic Ocean at 0 feet. Both lowest points are at or near sea level.
Guam vs Puerto Rico Population and History
Population: Guam has a population of 153,836 (2020), while Puerto Rico has 3,285,874 (2020). Puerto Rico's population is 21.4 times larger than Guam's.
Population density: Guam: 732.6 people per square mile vs Puerto Rico: 959.7. Puerto Rico's population density is 1.3 times (31%) higher than Guam's.
History: Guam: A US territory since 1898. Puerto Rico: A US territory since 1898; a commonwealth since 1952.
Official Websites
Guam official website · Puerto Rico official website
More Size Comparisons
All Guam size comparisons · All Puerto Rico size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.