Barry PhilipsWhen people search for US states that start with I, they are often surprised to discover that there are only a few. In fact, only four U.S. states begin with the letter “I”: Idaho, Illinois, Indiana, and Iowa.
Each of these states has a unique history, geography, economy, culture, and tourist attractions that make it an important part of the United States.
Whether you’re preparing for a geography quiz, researching U.S. states, teaching students, or simply curious, this comprehensive guide covers everything you need to know about the states that start with I.
US States That Start With I
1. Idaho
Idaho is located in the Pacific Northwest region of the United States. It became the 43rd state on July 3, 1890.
Known as the Gem State, Idaho is famous for its breathtaking mountains, forests, rivers, and agricultural production. It is also the leading producer of potatoes in the United States.
Basic Facts
- Capital: Boise
- Largest City: Boise
- State Nickname: The Gem State
- Population: Approximately 2 million
- Abbreviation: ID
Geography
Idaho features diverse landscapes including:
- Rocky Mountains
- Snake River Plain
- National forests
- Deep canyons
- Scenic lakes
Outdoor enthusiasts enjoy hiking, skiing, fishing, camping, rafting, and mountain biking throughout the state.
Economy
Idaho’s economy is driven by:
- Agriculture
- Food processing
- Technology
- Manufacturing
- Tourism
- Forestry
Besides potatoes, Idaho also produces wheat, barley, sugar beets, onions, and dairy products.
Famous Attractions
Some popular destinations include:
- Yellowstone National Park (partially accessible nearby)
- Craters of the Moon National Monument
- Shoshone Falls
- Sun Valley Resort
- Sawtooth National Recreation Area
Interesting Facts
- Idaho produces nearly one-third of America’s potatoes.
- It contains over 2,000 lakes.
- More than 60% of the land is publicly owned.
- The state is rich in gemstones, which inspired its nickname.
2. Illinois
Illinois is located in the Midwestern United States and became the 21st state on December 3, 1818.
Often called the Prairie State, Illinois is home to Chicago, one of America’s largest and most influential cities.
Basic Facts
- Capital: Springfield
- Largest City: Chicago
- State Nickname: The Prairie State
- Population: Approximately 12.5 million
- Abbreviation: IL
Geography
Illinois includes:
- Vast prairies
- Mississippi River
- Illinois River
- Lake Michigan shoreline
- Rich farmland
Northern Illinois is heavily urbanized, while central and southern Illinois are largely agricultural.
Economy
Illinois has one of the largest economies in America thanks to:
- Finance
- Manufacturing
- Transportation
- Agriculture
- Healthcare
- Technology
Chicago serves as a major transportation and financial hub.
Famous Attractions
Top attractions include:
- Millennium Park
- Willis Tower
- Navy Pier
- Abraham Lincoln Presidential Library and Museum
- Route 66 landmarks
Interesting Facts
- Chicago invented the first skyscraper.
- Abraham Lincoln spent much of his political career in Illinois.
- Illinois has one of the busiest airports in the world.
- The state grows large quantities of corn and soybeans.
3. Indiana
Indiana joined the Union as the 19th state on December 11, 1816.
Nicknamed the Hoosier State, Indiana is known for sports, manufacturing, agriculture, and friendly communities.
Basic Facts
- Capital: Indianapolis
- Largest City: Indianapolis
- State Nickname: The Hoosier State
- Population: Approximately 7 million
- Abbreviation: IN
Geography
Indiana features:
- Rolling hills
- Rivers
- Forests
- Fertile farmland
- Great Lakes shoreline
The northern part borders Lake Michigan.
Economy
Major industries include:
- Automobile manufacturing
- Agriculture
- Healthcare
- Pharmaceuticals
- Logistics
- Education
Indiana is one of America’s leading manufacturing states.
Famous Attractions
Popular destinations include:
- Indianapolis Motor Speedway
- Indiana Dunes National Park
- Children’s Museum of Indianapolis
- Brown County State Park
- White River State Park
Interesting Facts
- Indianapolis hosts the famous Indy 500 race.
- Indiana is among the largest producers of popcorn.
- Basketball is deeply embedded in Indiana’s culture.
- It has extensive limestone deposits used in famous buildings.
4. Iowa
Iowa became the 29th state on December 28, 1846.
Located in the Midwest, Iowa is renowned for its fertile farmland and agricultural productivity.
Its nickname is the Hawkeye State.
Basic Facts
- Capital: Des Moines
- Largest City: Des Moines
- State Nickname: The Hawkeye State
- Population: Approximately 3.2 million
- Abbreviation: IA
Geography
Iowa consists mainly of:
- Rolling plains
- Rivers
- Rich farmland
- Small towns
- Nature preserves
Its fertile soil makes it one of America’s top farming states.
Economy
Key industries include:
- Agriculture
- Insurance
- Renewable energy
- Food processing
- Manufacturing
- Biotechnology
Iowa is among America’s leading producers of corn, soybeans, pork, and eggs.
Famous Attractions
Visitors enjoy:
- Iowa State Fair
- Field of Dreams Movie Site
- Amana Colonies
- Maquoketa Caves State Park
- Pikes Peak State Park
Interesting Facts
- Iowa has more than 85,000 farms.
- It ranks among the nation’s leading wind energy producers.
- Agriculture contributes billions to its economy.
- The famous “Field of Dreams” baseball movie was filmed in Iowa.
Why Are There Only Four States That Start With I?
The United States has 50 states, but only four begin with the letter I.
This is largely due to the origins of state names, which come from:
- Native American languages
- European explorers
- Historical figures
- Geographic features
- Local cultural traditions
Only a small number of these names happened to begin with the letter I.
Similarities Among the I States
Although different in many ways, these states share several characteristics.
Strong Agricultural Heritage
All four states have significant agricultural industries.
Major products include:
- Corn
- Wheat
- Soybeans
- Potatoes
- Livestock
- Dairy products
Midwestern Influence
Illinois, Indiana, and Iowa are all considered part of the American Midwest.
These states share:
- Similar climates
- Farming traditions
- Manufacturing industries
- Strong sports cultures
Idaho, meanwhile, belongs to the Pacific Northwest and Mountain West regions.
Diverse Natural Landscapes
Collectively, these states offer:
- Mountains
- Prairies
- Rivers
- Lakes
- Forests
- National parks
- Scenic highways
Nature lovers have plenty to explore across all four.
Economic Importance
Together, these states contribute significantly to America’s economy through:
- Manufacturing
- Agriculture
- Finance
- Technology
- Healthcare
- Transportation
- Food production
Tourism Opportunities
Each state attracts millions of visitors every year for different reasons.
Popular experiences include:
- Outdoor adventures in Idaho
- City tourism in Chicago
- Motorsports in Indiana
- Agricultural festivals in Iowa
Educational and Cultural Significance
These states host numerous universities, museums, cultural festivals, and historical landmarks.
Examples include:
- University of Illinois
- Indiana University
- Boise State University
- University of Iowa
Their institutions contribute to research, innovation, and higher education across the country.
Comparison Table of US States That Start With I
| State | Capital | Largest City | Nickname | Statehood | Primary Industry |
|---|---|---|---|---|---|
| Idaho | Boise | Boise | The Gem State | 1890 | Agriculture, Technology |
| Illinois | Springfield | Chicago | The Prairie State | 1818 | Finance, Manufacturing |
| Indiana | Indianapolis | Indianapolis | The Hoosier State | 1816 | Manufacturing, Agriculture |
| Iowa | Des Moines | Des Moines | The Hawkeye State | 1846 | Agriculture, Insurance |
Frequently Asked Questions
How many US states start with the letter I?
There are four U.S. states that begin with the letter I.
Which US state starting with I has the largest population?
Illinois has the largest population among the four states.
Which state starting with I is famous for potatoes?
Idaho is internationally famous for producing potatoes.
Which I state is home to Chicago?
Illinois is home to Chicago.
Which I state hosts the Indy 500?
Indiana hosts the Indianapolis 500, one of the world’s most famous automobile races.
Which I state is known as the Hawkeye State?
Iowa is known as the Hawkeye State.
Related
Conclusion
Although there are only four U.S. states that start with the letter I—Idaho, Illinois, Indiana, and Iowa—each offers something unique. Idaho impresses with its rugged mountains and outdoor recreation, Illinois stands out with the vibrant city of Chicago and a diverse economy, Indiana is celebrated for manufacturing and motorsports, while Iowa remains one of the nation’s agricultural powerhouses.
Together, these states showcase the diversity of the United States, from fertile plains and bustling cities to mountain landscapes and rich cultural traditions. Whether you’re studying geography, planning a road trip, or expanding your knowledge of America, understanding these four “I” states provides valuable insight into the country’s history, economy, and regional character.