The map above shows Illinois and New Hampshire side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Illinois vs New Hampshire Geography
Land area: Illinois has a land area of 55,513 square miles (143,778 km²), while New Hampshire has 8,954 square miles (23,190 km²). Illinois' land area is 6.2 times (520%) larger than New Hampshire's.
Total area: Illinois: 57,913 square miles (149,995 km²) vs New Hampshire: 9,350 square miles (24,216 km²), including inland and coastal water. Illinois' total area is 6.2 times (519%) larger than New Hampshire's.
Length: Illinois is 390 miles (628 km) long from north to south; New Hampshire is 180 miles (290 km). Illinois' north-south length is 2.2 times (117%) longer than New Hampshire's.
Width: Illinois spans 283 miles (456 km) east to west; New Hampshire spans 95 miles (152 km). Illinois' east-west width is 3.0 times (198%) wider than New Hampshire's.
Highest point: Illinois's highest point is Charles Mound at 1,232 feet (376 m); New Hampshire's is Mount Washington at 6,277 feet (1,913 m). Mount Washington is 5,045 feet higher than Charles Mound.
Lowest point: Illinois's lowest point is Mississippi River at 292 feet; New Hampshire's is Atlantic Ocean at 0 feet. New Hampshire's lowest point is 292 feet lower.
Illinois vs New Hampshire Population and History
Population: Illinois has a population of 12,710,158 (2024), while New Hampshire has 1,409,032 (2024). Illinois' population is 9.0 times (802%) larger than New Hampshire's.
Population density: Illinois: 229.0 people per square mile vs New Hampshire: 157.4. Illinois' population density is 1.5 times (45%) higher than New Hampshire's.
Biggest city: Illinois's biggest city is Chicago with 2,721,308 people; New Hampshire's is Manchester with 116,386. Chicago's population is 23.4 times larger than Manchester's.
Largest metro area: Illinois's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs New Hampshire's Boston-Cambridge-Newton, MA-NH metro area (5,025,517). Chicago-Naperville-Elgin, IL-IN metro area's population is 1.9 times (87%) larger than Boston-Cambridge-Newton, MA-NH metro area's.
History: Illinois: Admitted to the Union on December 3, 1818, as the 21st state. New Hampshire: Admitted to the Union on June 21, 1788, as the 9th state. In its current form, New Hampshire is the older of the two by 30 years.
Illinois vs New Hampshire Economy
GDP: Illinois's GDP is $1,148.1 billion (2024) vs New Hampshire's $119.3 billion. Illinois' economic output is 9.6 times (862%) larger than New Hampshire's.
GDP per capita: Illinois: $90,330 per person vs New Hampshire: $84,694. Illinois' GDP per capita is 1.1 times (7%) higher than New Hampshire's.
Average income: Illinois: $74,522 vs New Hampshire: $83,192 average income per person (per capita personal income). New Hampshire's average income is 1.1 times (12%) higher than Illinois'.
Illinois vs New Hampshire Counties
Number of counties: Illinois has 102 counties, while New Hampshire has 10. Illinois' county count is 10.2 times higher than New Hampshire's.
Biggest county by area: Illinois's largest county is McLean County at 1,183 square miles; New Hampshire's is Coos County at 1,795 square miles. Coos County's land area is 1.5 times (52%) larger than McLean County's.
Smallest county by area: Illinois: Putnam County (160 sq mi) vs New Hampshire: Strafford County (368 sq mi). Strafford County's land area is 2.3 times (130%) larger than Putnam County's.
Most populous county: Illinois: Cook County (5,182,617 people) vs New Hampshire: Hillsborough County (430,462 people). Cook County's population is 12.0 times larger than Hillsborough County's.
Least populous county: Illinois: Hardin County (3,550 people) vs New Hampshire: Coos County (31,094 people). Coos County's population is 8.8 times (776%) larger than Hardin County's.
Richest county: Illinois: Cumberland County ($104,890 per capita income) vs New Hampshire: Rockingham County ($100,216). Cumberland County and Rockingham County have about the same income.
Poorest county: Illinois: Lawrence County ($43,606 per capita income) vs New Hampshire: Coos County ($60,657). Coos County's income is 1.4 times (39%) richer than Lawrence County's.
Illinois vs New Hampshire Taxes
State income tax: Illinois has a top income tax rate of 4.95%, while New Hampshire has no state income tax. Illinois's top rate is 4.95 percentage points higher.
Property tax: Illinois: 1.92% effective rate vs New Hampshire: 1.46% of home value per year. Illinois's rate is 0.46 percentage points higher.
Sales tax: Illinois: 8.98% combined state and average local rate vs New Hampshire: 0%. Illinois's combined rate is 8.98 percentage points higher.
Official Websites
Illinois official website · New Hampshire official website
More Size Comparisons
All Illinois size comparisons · All New Hampshire 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.