The map above shows District of Columbia and Idaho side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
District of Columbia vs Idaho Geography
Land area: District of Columbia has a land area of 61 square miles (158 km²), while Idaho has 82,645 square miles (214,051 km²). Idaho's land area is 1,354.8 times larger than District of Columbia's.
Total area: District of Columbia: 68 square miles (177 km²) vs Idaho: 83,569 square miles (216,441 km²), including inland and coastal water. Idaho's total area is 1,222.8 times larger than District of Columbia's.
Length: District of Columbia is 13 miles (22 km) long from north to south; Idaho is 483 miles (778 km). Idaho's north-south length is 37.2 times longer than District of Columbia's.
Width: District of Columbia spans 12 miles (19 km) east to west; Idaho spans 352 miles (566 km). Idaho's east-west width is 29.3 times wider than District of Columbia's.
Highest point: District of Columbia's highest point is Fort Reno at 429 feet (131 m); Idaho's is Borah Peak at 12,631 feet (3,850 m). Borah Peak is 12,202 feet higher than Fort Reno.
Lowest point: District of Columbia's lowest point is Potomac River at 0 feet; Idaho's is Snake River at 718 feet. District of Columbia's lowest point is 718 feet lower.
District of Columbia vs Idaho Population and History
Population: District of Columbia has a population of 702,250 (2024), while Idaho has 2,001,619 (2024). Idaho's population is 2.9 times (185%) larger than District of Columbia's.
Population density: District of Columbia: 11,493.5 people per square mile vs Idaho: 24.2. District of Columbia's population density is 474.9 times higher than Idaho's.
Biggest city: District of Columbia's biggest city is Washington with 702,250 people; Idaho's is Boise with 237,963. Washington's population is 3.0 times (195%) larger than Boise's.
Largest metro area: District of Columbia's largest metropolitan area is Washington-Arlington-Alexandria, DC-VA-MD-WV metro area (6,436,489 people) vs Idaho's Boise City, ID metro area (845,877). Washington-Arlington-Alexandria, DC-VA-MD-WV metro area's population is 7.6 times (661%) larger than Boise City, ID metro area's.
History: District of Columbia: The federal district, established by the Residence Act on July 16, 1790; not a state. Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. In its current form, District of Columbia is the older of the two by 100 years.
District of Columbia vs Idaho Economy
GDP: District of Columbia's GDP is $184.3 billion (2024) vs Idaho's $129.0 billion. District of Columbia's economic output is 1.4 times (43%) larger than Idaho's.
GDP per capita: District of Columbia: $262,439 per person vs Idaho: $64,457. District of Columbia's GDP per capita is 4.1 times (307%) higher than Idaho's.
Average income: District of Columbia: $111,185 vs Idaho: $62,323 average income per person (per capita personal income). District of Columbia's average income is 1.8 times (78%) higher than Idaho's.
District of Columbia vs Idaho Counties
Number of counties: District of Columbia has 1 counties, while Idaho has 44. Idaho's county count is 44.0 times higher than District of Columbia's.
Biggest county by area: District of Columbia's largest county is District of Columbia at 61 square miles; Idaho's is Idaho County at 8,478 square miles. Idaho County's land area is 138.7 times larger than District of Columbia's.
Smallest county by area: District of Columbia: District of Columbia (61 sq mi) vs Idaho: Payette County (407 sq mi). Payette County's land area is 6.7 times (566%) larger than District of Columbia's.
Most populous county: District of Columbia: District of Columbia (702,250 people) vs Idaho: Ada County (535,799 people). District of Columbia's population is 1.3 times (31%) larger than Ada County's.
Least populous county: District of Columbia: District of Columbia (702,250 people) vs Idaho: Clark County (794 people). District of Columbia's population is 884.4 times larger than Clark County's.
Richest county: District of Columbia: District of Columbia ($111,185 per capita income) vs Idaho: Blaine County ($202,612). Blaine County's income is 1.8 times (82%) richer than District of Columbia's.
Poorest county: District of Columbia: District of Columbia ($111,185 per capita income) vs Idaho: Madison County ($29,485). District of Columbia's income is 3.8 times (277%) richer than Madison County's.
District of Columbia vs Idaho Taxes
State income tax: District of Columbia has a top income tax rate of 10.75%, while Idaho has a top income tax rate of 5.3%. District of Columbia's top rate is 5.45 percentage points higher.
Property tax: District of Columbia: 0.63% effective rate vs Idaho: 0.43% of home value per year. District of Columbia's rate is 0.2 percentage points higher.
Sales tax: District of Columbia: 6% combined state and average local rate vs Idaho: 6.03%. Idaho's combined rate is 0.03 percentage points higher.
Official Websites
District of Columbia official website · Idaho official website
More Size Comparisons
All District of Columbia size comparisons · All Idaho 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.