The map above shows Arizona and Illinois side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arizona vs Illinois Geography
Land area
- Arizona has a land area of 113,655 square miles (294,366 km²), while Illinois has 55,513 square miles (143,778 km²).
- Arizona's land area is 2.0 times (105%) larger than Illinois'.
Total area
- Arizona: 113,985 square miles (295,220 km²) vs Illinois: 57,913 square miles (149,995 km²), including inland and coastal water.
- Arizona's total area is 2.0 times (97%) larger than Illinois'.
Length
- Arizona is 429 miles (690 km) long from north to south; Illinois is 390 miles (628 km).
- Arizona's north-south length is 1.1 times (10%) longer than Illinois'.
Width
- Arizona spans 452 miles (727 km) east to west; Illinois spans 283 miles (456 km).
- Arizona's east-west width is 1.6 times (60%) wider than Illinois'.
Highest point
- Arizona's highest point is Humphreys Peak at 12,620 feet (3,847 m); Illinois's is Charles Mound at 1,232 feet (376 m).
- Humphreys Peak is 11,388 feet higher than Charles Mound.
Lowest point
- Arizona's lowest point is Colorado River at 71 feet; Illinois's is Mississippi River at 292 feet.
- Arizona's lowest point is 221 feet lower.
Arizona vs Illinois Population and History
Population
- Arizona has a population of 7,582,384 (2024), while Illinois has 12,710,158 (2024).
- Illinois' population is 1.7 times (68%) larger than Arizona's.
Population density
- Arizona: 66.7 people per square mile vs Illinois: 229.0.
- Illinois' population density is 3.4 times (243%) higher than Arizona's.
Biggest city
- Arizona's biggest city is Phoenix with 1,673,164 people; Illinois's is Chicago with 2,721,308.
- Chicago's population is 1.6 times (63%) larger than Phoenix's.
Largest metro area
- Arizona's largest metropolitan area is Phoenix-Mesa-Chandler, AZ metro area (5,186,958 people) vs Illinois's Chicago-Naperville-Elgin, IL-IN metro area (9,408,576).
- Chicago-Naperville-Elgin, IL-IN metro area's population is 1.8 times (81%) larger than Phoenix-Mesa-Chandler, AZ metro area's.
History
- Arizona: Admitted to the Union on February 14, 1912, as the 48th state.
- Illinois: Admitted to the Union on December 3, 1818, as the 21st state.
- In its current form, Illinois is the older of the two by 94 years.
Arizona vs Illinois Economy
GDP
- Arizona's GDP is $570.1 billion (2024) vs Illinois's $1,148.1 billion.
- Illinois' economic output is 2.0 times (101%) larger than Arizona's.
GDP per capita
- Arizona: $75,186 per person vs Illinois: $90,330.
- Illinois' GDP per capita is 1.2 times (20%) higher than Arizona's.
Average income
- Arizona: $65,798 vs Illinois: $74,522 average income per person (per capita personal income).
- Illinois' average income is 1.1 times (13%) higher than Arizona's.
Arizona vs Illinois Counties
Number of counties
- Arizona has 15 counties, while Illinois has 102.
- Illinois' county count is 6.8 times (580%) higher than Arizona's.
Biggest county by area
- Arizona's largest county is Coconino County at 18,616 square miles; Illinois's is McLean County at 1,183 square miles.
- Coconino County's land area is 15.7 times larger than McLean County's.
Smallest county by area
- Arizona: Santa Cruz County (1,236 sq mi) vs Illinois: Putnam County (160 sq mi).
- Santa Cruz County's land area is 7.7 times (672%) larger than Putnam County's.
Most populous county
- Arizona: Maricopa County (4,673,096 people) vs Illinois: Cook County (5,182,617 people).
- Cook County's population is 1.1 times (11%) larger than Maricopa County's.
Least populous county
- Arizona: Greenlee County (9,410 people) vs Illinois: Hardin County (3,550 people).
- Greenlee County's population is 2.7 times (165%) larger than Hardin County's.
Richest county
- Arizona: Maricopa County ($72,176 per capita income) vs Illinois: Cumberland County ($104,890).
- Cumberland County's income is 1.5 times (45%) richer than Maricopa County's.
Poorest county
- Arizona: Graham County ($44,164 per capita income) vs Illinois: Lawrence County ($43,606).
- Graham County and Lawrence County have about the same income.
Arizona vs Illinois Taxes
State income tax
- Arizona has a top income tax rate of 2.5%, while Illinois has a top income tax rate of 4.95%.
- Illinois's top rate is 2.45 percentage points higher.
Property tax
- Arizona: 0.43% effective rate vs Illinois: 1.92% of home value per year.
- Illinois's rate is 1.49 percentage points higher.
Sales tax
- Arizona: 8.54% combined state and average local rate vs Illinois: 8.98%.
- Illinois's combined rate is 0.44 percentage points higher.
Official Websites
Arizona official website · Illinois official website
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More Size Comparisons
All Arizona size comparisons · All Illinois 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.