The map above shows Guam and United Kingdom side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Guam vs United Kingdom Geography
Land area: Guam has a land area of 210 square miles (544 km²), while United Kingdom has 93,410 square miles (241,930 km²). United Kingdom's land area is 444.7 times larger than Guam's.
Total area: Guam: 210 square miles (544 km²) vs United Kingdom: 94,058 square miles (243,610 km²), including inland and coastal water. United Kingdom's total area is 447.8 times larger than Guam's.
Length: Guam is 27 miles (43 km) long from north to south; United Kingdom is 747 miles (1,202 km). United Kingdom's north-south length is 27.7 times longer than Guam's.
Width: Guam spans 22 miles (35 km) east to west; United Kingdom spans 429 miles (690 km). United Kingdom's east-west width is 19.5 times wider than Guam's.
Highest point: Guam's highest point is Mount Lamlam at 1,332 feet (406 m); United Kingdom's is Ben Nevis at 4,413 feet (1,345 m). Ben Nevis is 3,081 feet higher than Mount Lamlam.
Lowest point: Guam's lowest point is Pacific Ocean at 0 feet; United Kingdom's is The Fens (Holme Fen) at -10 feet. United Kingdom's lowest point is 10 feet lower.
Guam vs United Kingdom Population and History
Population: Guam has a population of 153,836 (2020), while United Kingdom has 69,487,000 (2025). United Kingdom's population is 451.7 times larger than Guam's.
Population density: Guam: 732.6 people per square mile vs United Kingdom: 743.9. Guam and United Kingdom have about the same population density.
History: Guam: A US territory since 1898. United Kingdom: Formed as the United Kingdom of Great Britain and Ireland on January 1, 1801; took its current form in 1922. In its current form, United Kingdom is the older of the two by 97 years.
Official Websites
Guam official website · United Kingdom official website
More Size Comparisons
All Guam size comparisons · All United Kingdom 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.