The map above shows Idaho and Maryland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Maryland Geography
Land area: Idaho has a land area of 82,645 square miles (214,051 km²), while Maryland has 9,711 square miles (25,151 km²). Idaho's land area is 8.5 times (751%) larger than Maryland's.
Total area: Idaho: 83,569 square miles (216,441 km²) vs Maryland: 12,406 square miles (32,131 km²), including inland and coastal water. Idaho's total area is 6.7 times (574%) larger than Maryland's.
Length: Idaho is 483 miles (778 km) long from north to south; Maryland is 231 miles (371 km). Idaho's north-south length is 2.1 times (109%) longer than Maryland's.
Width: Idaho spans 352 miles (566 km) east to west; Maryland spans 243 miles (391 km). Idaho's east-west width is 1.4 times (45%) wider than Maryland's.
Highest point: Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Maryland's is Hoye-Crest at 3,362 feet (1,025 m). Borah Peak is 9,269 feet higher than Hoye-Crest.
Lowest point: Idaho's lowest point is Snake River at 718 feet; Maryland's is Atlantic Ocean at 0 feet. Maryland's lowest point is 718 feet lower.
Idaho vs Maryland Population and History
Population: Idaho has a population of 2,001,619 (2024), while Maryland has 6,263,220 (2024). Maryland's population is 3.1 times (213%) larger than Idaho's.
Population density: Idaho: 24.2 people per square mile vs Maryland: 645.0. Maryland's population density is 26.7 times higher than Idaho's.
Biggest city: Idaho's biggest city is Boise with 237,963 people; Maryland's is Baltimore with 568,271. Baltimore's population is 2.4 times (139%) larger than Boise's.
Largest metro area: Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Maryland's Washington-Arlington-Alexandria, DC-VA-MD-WV metro area (6,436,489). 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: Idaho: Admitted to the Union on July 3, 1890, as the 43rd state. Maryland: Admitted to the Union on April 28, 1788, as the 7th state. In its current form, Maryland is the older of the two by 102 years.
Idaho vs Maryland Economy
GDP: Idaho's GDP is $129.0 billion (2024) vs Maryland's $546.0 billion. Maryland's economic output is 4.2 times (323%) larger than Idaho's.
GDP per capita: Idaho: $64,457 per person vs Maryland: $87,180. Maryland's GDP per capita is 1.4 times (35%) higher than Idaho's.
Average income: Idaho: $62,323 vs Maryland: $79,259 average income per person (per capita personal income). Maryland's average income is 1.3 times (27%) higher than Idaho's.
Idaho vs Maryland Counties
Number of counties: Idaho has 44 counties, while Maryland has 24. Idaho's county count is 1.8 times (83%) higher than Maryland's.
Biggest county by area: Idaho's largest county is Idaho County at 8,478 square miles; Maryland's is Frederick County at 661 square miles. Idaho County's land area is 12.8 times larger than Frederick County's.
Smallest county by area: Idaho: Payette County (407 sq mi) vs Maryland: Baltimore city (81 sq mi). Payette County's land area is 5.0 times (403%) larger than Baltimore city's.
Most populous county: Idaho: Ada County (535,799 people) vs Maryland: Montgomery County (1,082,273 people). Montgomery County's population is 2.0 times (102%) larger than Ada County's.
Least populous county: Idaho: Clark County (794 people) vs Maryland: Kent County (19,557 people). Kent County's population is 24.6 times larger than Clark County's.
Richest county: Idaho: Blaine County ($202,612 per capita income) vs Maryland: Montgomery County ($104,882). Blaine County's income is 1.9 times (93%) richer than Montgomery County's.
Poorest county: Idaho: Madison County ($29,485 per capita income) vs Maryland: Somerset County ($41,421). Somerset County's income is 1.4 times (40%) richer than Madison County's.
Idaho vs Maryland Taxes
State income tax: Idaho has a top income tax rate of 5.3%, while Maryland has a top income tax rate of 6.5%. Maryland's top rate is 1.2 percentage points higher.
Property tax: Idaho: 0.43% effective rate vs Maryland: 0.95% of home value per year. Maryland's rate is 0.52 percentage points higher.
Sales tax: Idaho: 6.03% combined state and average local rate vs Maryland: 6%. Idaho's combined rate is 0.03 percentage points higher.
Official Websites
Idaho official website · Maryland official website
More Size Comparisons
All Idaho size comparisons · All Maryland 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.