The map above shows Maryland and Ohio side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Maryland vs Ohio Geography
Land area: Maryland has a land area of 9,711 square miles (25,151 km²), while Ohio has 40,859 square miles (105,824 km²). Ohio's land area is 4.2 times (321%) larger than Maryland's.
Total area: Maryland: 12,406 square miles (32,131 km²) vs Ohio: 44,826 square miles (116,098 km²), including inland and coastal water. Ohio's total area is 3.6 times (261%) larger than Maryland's.
Length: Maryland is 231 miles (371 km) long from north to south; Ohio is 291 miles (468 km). Ohio's north-south length is 1.3 times (26%) longer than Maryland's.
Width: Maryland spans 243 miles (391 km) east to west; Ohio spans 317 miles (510 km). Ohio's east-west width is 1.3 times (30%) wider than Maryland's.
Highest point: Maryland's highest point is Hoye-Crest at 3,362 feet (1,025 m); Ohio's is Campbell Hill at 1,547 feet (472 m). Hoye-Crest is 1,815 feet higher than Campbell Hill.
Lowest point: Maryland's lowest point is Atlantic Ocean at 0 feet; Ohio's is Ohio River at 455 feet. Maryland's lowest point is 455 feet lower.
Maryland vs Ohio Population and History
Population: Maryland has a population of 6,263,220 (2024), while Ohio has 11,883,304 (2024). Ohio's population is 1.9 times (90%) larger than Maryland's.
Population density: Maryland: 645.0 people per square mile vs Ohio: 290.8. Maryland's population density is 2.2 times (122%) higher than Ohio's.
Biggest city: Maryland's biggest city is Baltimore with 568,271 people; Ohio's is Columbus with 933,263. Columbus' population is 1.6 times (64%) larger than Baltimore's.
Largest metro area: Maryland's largest metropolitan area is Washington-Arlington-Alexandria, DC-VA-MD-WV metro area (6,436,489 people) vs Ohio's Cincinnati, OH-KY-IN metro area (2,302,815). Washington-Arlington-Alexandria, DC-VA-MD-WV metro area's population is 2.8 times (180%) larger than Cincinnati, OH-KY-IN metro area's.
History: Maryland: Admitted to the Union on April 28, 1788, as the 7th state. Ohio: Admitted to the Union on March 1, 1803, as the 17th state. In its current form, Maryland is the older of the two by 15 years.
Maryland vs Ohio Economy
GDP: Maryland's GDP is $546.0 billion (2024) vs Ohio's $923.1 billion. Ohio's economic output is 1.7 times (69%) larger than Maryland's.
GDP per capita: Maryland: $87,180 per person vs Ohio: $77,684. Maryland's GDP per capita is 1.1 times (12%) higher than Ohio's.
Average income: Maryland: $79,259 vs Ohio: $64,464 average income per person (per capita personal income). Maryland's average income is 1.2 times (23%) higher than Ohio's.
Maryland vs Ohio Counties
Number of counties: Maryland has 24 counties, while Ohio has 88. Ohio's county count is 3.7 times (267%) higher than Maryland's.
Biggest county by area: Maryland's largest county is Frederick County at 661 square miles; Ohio's is Ashtabula County at 702 square miles. Ashtabula County's land area is 1.1 times (6%) larger than Frederick County's.
Smallest county by area: Maryland: Baltimore city (81 sq mi) vs Ohio: Lake County (229 sq mi). Lake County's land area is 2.8 times (184%) larger than Baltimore city's.
Most populous county: Maryland: Montgomery County (1,082,273 people) vs Ohio: Franklin County (1,356,303 people). Franklin County's population is 1.3 times (25%) larger than Montgomery County's.
Least populous county: Maryland: Kent County (19,557 people) vs Ohio: Vinton County (12,545 people). Kent County's population is 1.6 times (56%) larger than Vinton County's.
Richest county: Maryland: Montgomery County ($104,882 per capita income) vs Ohio: Delaware County ($96,573). Montgomery County's income is 1.1 times (9%) richer than Delaware County's.
Poorest county: Maryland: Somerset County ($41,421 per capita income) vs Ohio: Noble County ($34,940). Somerset County's income is 1.2 times (19%) richer than Noble County's.
Maryland vs Ohio Taxes
State income tax: Maryland has a top income tax rate of 6.5%, while Ohio has a top income tax rate of 2.75%. Maryland's top rate is 3.75 percentage points higher.
Property tax: Maryland: 0.95% effective rate vs Ohio: 1.22% of home value per year. Ohio's rate is 0.27 percentage points higher.
Sales tax: Maryland: 6% combined state and average local rate vs Ohio: 7.29%. Ohio's combined rate is 1.29 percentage points higher.
Official Websites
Maryland official website · Ohio official website
More Size Comparisons
All Maryland size comparisons · All Ohio 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.