The map above shows South Dakota and United Kingdom side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
South Dakota vs United Kingdom Geography
Land area: South Dakota has a land area of 75,808 square miles (196,342 km²), while United Kingdom has 93,410 square miles (241,930 km²). United Kingdom's land area is 1.2 times (23%) larger than South Dakota's.
Total area: South Dakota: 77,116 square miles (199,729 km²) vs United Kingdom: 94,058 square miles (243,610 km²), including inland and coastal water. United Kingdom's total area is 1.2 times (22%) larger than South Dakota's.
Length: South Dakota is 443 miles (712 km) long from north to south; United Kingdom is 747 miles (1,202 km). United Kingdom's north-south length is 1.7 times (69%) longer than South Dakota's.
Width: South Dakota spans 371 miles (597 km) east to west; United Kingdom spans 429 miles (690 km). United Kingdom's east-west width is 1.2 times (16%) wider than South Dakota's.
Highest point: South Dakota's highest point is Black Elk Peak at 7,198 feet (2,194 m); United Kingdom's is Ben Nevis at 4,413 feet (1,345 m). Black Elk Peak is 2,785 feet higher than Ben Nevis.
Lowest point: South Dakota's lowest point is Big Stone Lake at 966 feet; United Kingdom's is The Fens (Holme Fen) at -10 feet. United Kingdom's lowest point is 976 feet lower.
South Dakota vs United Kingdom Population and History
Population: South Dakota has a population of 924,669 (2024), while United Kingdom has 69,487,000 (2025). United Kingdom's population is 75.1 times larger than South Dakota's.
Population density: South Dakota: 12.2 people per square mile vs United Kingdom: 743.9. United Kingdom's population density is 61.0 times higher than South Dakota's.
Biggest city: South Dakota's biggest city is Sioux Falls with 209,289 people; United Kingdom's is London with 8,825,001. London's population is 42.2 times larger than Sioux Falls'.
Largest metro area: South Dakota's largest metropolitan area is Sioux Falls, SD-MN metro area (308,266 people) vs United Kingdom's London (10,416,420). London's population is 33.8 times larger than Sioux Falls, SD-MN metro area's.
History: South Dakota: Admitted to the Union on November 2, 1889, as the 40th state. 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 88 years.
South Dakota vs United Kingdom Economy
GDP: South Dakota's GDP is $76.8 billion (2024) vs United Kingdom's $4,002.6 billion. United Kingdom's economic output is 52.1 times larger than South Dakota's.
GDP per capita: South Dakota: $83,052 per person vs United Kingdom: $57,602. South Dakota's GDP per capita is 1.4 times (44%) higher than United Kingdom's.
Average income: South Dakota: $75,699 vs United Kingdom: $54,550 average income per person (per capita personal income). South Dakota's average income is 1.4 times (39%) higher than United Kingdom's.
Official Websites
South Dakota official website · United Kingdom official website
More Size Comparisons
All South Dakota 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.