The map above shows South Dakota and Guam side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
South Dakota vs Guam Geography
Land area: South Dakota has a land area of 75,808 square miles (196,342 km²), while Guam has 210 square miles (544 km²). South Dakota's land area is 360.9 times larger than Guam's.
Total area: South Dakota: 77,116 square miles (199,729 km²) vs Guam: 210 square miles (544 km²), including inland and coastal water. South Dakota's total area is 367.1 times larger than Guam's.
Length: South Dakota is 443 miles (712 km) long from north to south; Guam is 27 miles (43 km). South Dakota's north-south length is 16.4 times longer than Guam's.
Width: South Dakota spans 371 miles (597 km) east to west; Guam spans 22 miles (35 km). South Dakota's east-west width is 16.9 times wider than Guam's.
Highest point: South Dakota's highest point is Black Elk Peak at 7,198 feet (2,194 m); Guam's is Mount Lamlam at 1,332 feet (406 m). Black Elk Peak is 5,866 feet higher than Mount Lamlam.
Lowest point: South Dakota's lowest point is Big Stone Lake at 966 feet; Guam's is Pacific Ocean at 0 feet. Guam's lowest point is 966 feet lower.
South Dakota vs Guam Population and History
Population: South Dakota has a population of 924,669 (2024), while Guam has 153,836 (2020). South Dakota's population is 6.0 times (501%) larger than Guam's.
Population density: South Dakota: 12.2 people per square mile vs Guam: 732.6. Guam's population density is 60.0 times higher than South Dakota's.
History: South Dakota: Admitted to the Union on November 2, 1889, as the 40th state. Guam: A US territory since 1898. In its current form, South Dakota is the older of the two by 9 years.
Official Websites
South Dakota official website · Guam official website
More Size Comparisons
All South Dakota size comparisons · All Guam 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.