The map above shows Maryland and Pennsylvania side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Maryland vs Pennsylvania Geography
Land area: Maryland has a land area of 9,711 square miles (25,151 km²), while Pennsylvania has 44,742 square miles (115,882 km²). Pennsylvania's land area is 4.6 times (361%) larger than Maryland's.
Total area: Maryland: 12,406 square miles (32,131 km²) vs Pennsylvania: 46,054 square miles (119,279 km²), including inland and coastal water. Pennsylvania's total area is 3.7 times (271%) larger than Maryland's.
Length: Maryland is 231 miles (371 km) long from north to south; Pennsylvania is 284 miles (458 km). Pennsylvania's north-south length is 1.2 times (23%) longer than Maryland's.
Width: Maryland spans 243 miles (391 km) east to west; Pennsylvania spans 307 miles (495 km). Pennsylvania's east-west width is 1.3 times (26%) wider than Maryland's.
Highest point: Maryland's highest point is Hoye-Crest at 3,362 feet (1,025 m); Pennsylvania's is Mount Davis at 3,210 feet (978 m). Hoye-Crest is 152 feet higher than Mount Davis.
Lowest point: Maryland's lowest point is Atlantic Ocean at 0 feet; Pennsylvania's is Delaware River at 0 feet. Both lowest points are at or near sea level.
Maryland vs Pennsylvania Population and History
Population: Maryland has a population of 6,263,220 (2024), while Pennsylvania has 13,078,751 (2024). Pennsylvania's population is 2.1 times (109%) larger than Maryland's.
Population density: Maryland: 645.0 people per square mile vs Pennsylvania: 292.3. Maryland's population density is 2.2 times (121%) higher than Pennsylvania's.
Biggest city: Maryland's biggest city is Baltimore with 568,271 people; Pennsylvania's is Philadelphia with 1,573,916. Philadelphia's population is 2.8 times (177%) 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 Pennsylvania's Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro area (6,330,422). Washington-Arlington-Alexandria, DC-VA-MD-WV metro area and Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro area have about the same population.
History: Maryland: Admitted to the Union on April 28, 1788, as the 7th state. Pennsylvania: Admitted to the Union on December 12, 1787, as the 2nd state. In its current form, Pennsylvania is the older of the two by 1 years.
Maryland vs Pennsylvania Economy
GDP: Maryland's GDP is $546.0 billion (2024) vs Pennsylvania's $1,007.9 billion. Pennsylvania's economic output is 1.8 times (85%) larger than Maryland's.
GDP per capita: Maryland: $87,180 per person vs Pennsylvania: $77,062. Maryland's GDP per capita is 1.1 times (13%) higher than Pennsylvania's.
Average income: Maryland: $79,259 vs Pennsylvania: $70,678 average income per person (per capita personal income). Maryland's average income is 1.1 times (12%) higher than Pennsylvania's.
Maryland vs Pennsylvania Counties
Number of counties: Maryland has 24 counties, while Pennsylvania has 67. Pennsylvania's county count is 2.8 times (179%) higher than Maryland's.
Biggest county by area: Maryland's largest county is Frederick County at 661 square miles; Pennsylvania's is Lycoming County at 1,229 square miles. Lycoming County's land area is 1.9 times (86%) larger than Frederick County's.
Smallest county by area: Maryland: Baltimore city (81 sq mi) vs Pennsylvania: Montour County (130 sq mi). Montour County's land area is 1.6 times (61%) larger than Baltimore city's.
Most populous county: Maryland: Montgomery County (1,082,273 people) vs Pennsylvania: Philadelphia County (1,573,916 people). Philadelphia County's population is 1.5 times (45%) larger than Montgomery County's.
Least populous county: Maryland: Kent County (19,557 people) vs Pennsylvania: Cameron County (4,348 people). Kent County's population is 4.5 times (350%) larger than Cameron County's.
Richest county: Maryland: Montgomery County ($104,882 per capita income) vs Pennsylvania: Chester County ($110,883). Chester County's income is 1.1 times (6%) richer than Montgomery County's.
Poorest county: Maryland: Somerset County ($41,421 per capita income) vs Pennsylvania: Forest County ($30,234). Somerset County's income is 1.4 times (37%) richer than Forest County's.
Maryland vs Pennsylvania Taxes
State income tax: Maryland has a top income tax rate of 6.5%, while Pennsylvania has a top income tax rate of 3.07%. Maryland's top rate is 3.43 percentage points higher.
Property tax: Maryland: 0.95% effective rate vs Pennsylvania: 1.16% of home value per year. Pennsylvania's rate is 0.21 percentage points higher.
Sales tax: Maryland: 6% combined state and average local rate vs Pennsylvania: 6.34%. Pennsylvania's combined rate is 0.34 percentage points higher.
Official Websites
Maryland official website · Pennsylvania official website
More Size Comparisons
All Maryland size comparisons · All Pennsylvania 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.