Illinois, located in the Midwestern United States, is divided into 102 counties and has over 1,200 incorporated municipalities, including cities, towns, and villages. Chicago, the largest city and one of the most populous in the country, is a major global hub. Other significant cities include Aurora, Naperville, Rockford, Joliet, and Springfield, the state capital. Illinois has a population of approximately 12.6 million people, making it the sixth most populous state in the U.S. It covers an area of about 57,914 square miles, ranking 25th in terms of size. The state’s geography is diverse, with Chicago located on Lake Michigan’s shore in the northeast, large agricultural areas in the central part of the state, and the southern region near the confluence of the Mississippi and Ohio Rivers. Major airports include Chicago O’Hare International Airport (ORD), one of the busiest airports in the world, and Chicago Midway International Airport (MDW), both serving as key hubs for domestic and international travel. Other important airports include St. Louis Lambert International Airport (STL), located near the Illinois border, and General Wayne A. Downing Peoria International Airport (PIA). Illinois is home to several prestigious institutions of higher education, including the University of Illinois system with its flagship campus in Urbana-Champaign, Northwestern University in Evanston, and the University of Chicago, known for its research and academic excellence. Illinois also hosts several large public universities such as Illinois State University and Northern Illinois University. The healthcare system in Illinois is extensive, with some of the nation’s leading hospitals. Northwestern Memorial Hospital in Chicago, Rush University Medical Center, and the University of Chicago Medical Center are renowned for their specialized care and medical research. Other significant hospitals include Advocate Christ Medical Center in Oak Lawn and OSF Saint Francis Medical Center in Peoria. The state also has several major children’s hospitals, including Lurie Children’s Hospital in Chicago. Illinois’ healthcare facilities provide comprehensive care across urban and rural areas, with many hospitals recognized for their expertise in fields such as oncology, cardiology, and trauma care, ensuring access to high-quality medical services for the state’s diverse population.
Illinois has 102 counties. The most populous counties are Cook County (Chicago), DuPage County, Lake County, Will County, Kane County, McHenry County, Winnebago County, Madison County, St. Clair County, and Sangamon County (Springfield). Cook...
Illinois has around 1,300 incorporated cities and towns. The state capital is Springfield, but the largest city by far is Chicago, which is the third-largest city in the U.S. Other significant cities include Aurora,...
Union County is located in the southern part of Illinois, known for its rich history and agricultural roots. Established in 1818, the county is nestled within the Shawnee National Forest, providing a backdrop of...
Morgan County, established in 1823, is located in west-central Illinois. The county was named after General Daniel Morgan, a hero of the American Revolutionary War. It features a mix of rural landscapes and small...
Marshall County is located in the north-central region of Illinois, known for its scenic countryside, rolling farmland, and charming towns. Established in 1839 and named after John Marshall, Chief Justice of the U.S. Supreme...
Madison County is located in the southwestern part of Illinois, bordered by the Mississippi River to the west and the state of Missouri to the south. Established in 1820, the county was named in...
Effingham County, located in central Illinois, was established in 1831 and named after the town of Effingham, which is itself named after Lord Effingham. The county is known for its rich agricultural land and...
Cumberland County, established in 1843, is located in east-central Illinois. The county is characterized by its rural landscapes, agricultural heritage, and small-town charm. Named after the Cumberland Road, a historic route that promoted westward...
Bond County, established in 1817, is located in south-central Illinois, bordered by the Kaskaskia River to the west. The county was named after Shadrach Bond, the first Governor of Illinois, and boasts a rich...
Rutland, Illinois is a small village located in the northern part of Iroquois County, about 25 miles south of Kankakee. It is situated in a rural area and is surrounded by rolling hills and...
Rushville, Illinois is a small city located in Schuyler County, about 80 miles southwest of Chicago. With a population of just over 4,000 people, Rushville is the county seat and the largest city in...
Royalton is a small village in southern Illinois, located in Franklin County. It is bordered by the towns of West Frankfort, Christopher, Benton and Sesser. The population was 1,128 at the 2010 census. The...
Royal, Illinois is a small village in Will County, located about 25 miles southwest of Chicago. It is a quiet, rural town with a population of around 1,500 people. The town was founded in...
Roxana, Illinois is a small village located in Madison County in the Greater St. Louis Metropolitan Area of Southern Illinois. The village is situated along the banks of the Mississippi River and has a...
Round Lake, Illinois is a village located in Lake County, within the Chicago metropolitan area. It has a population of roughly 19,000 people and is situated just 35 miles northwest of Chicago. The village...
Rossville is a small city located in the state of Illinois, about an hour’s drive south of Chicago. The city is situated along the banks of the Vermilion River and is surrounded by rolling...
Population: 1,213. Estimated population in July 2024: 1,168 (-3.7% change) Males: 551 (45.4%), Females: 662 (54.6%) Hardin County Zip code: 62982 Demographics Median resident age: 42.3 years Median household income: $22,600 Median house value:...
Population: 1,083. Estimated population in July 2024: 998 (-7.8% change) Males: 483 (44.6%), Females: 600 (55.4%) Warren County Zip code: 61473 Demographics Median resident age: 44.5 years Median household income: $32,031 Median house value:...
Population: 23,115. Estimated population in July 2024: 23,240 (+0.5% change) Males: 11,301 (48.9%), Females: 11,814 (51.1%) DuPage County Zip code: 60172 Demographics Median resident age: 35.4 years Median household income: $65,254 Median house value:...
Population: 6,244. Estimated population in July 2024: 6,355 (+1.8% change) Males: 3,108 (49.8%), Females: 3,136 (50.2%) Winnebago County Zip code: 61073 Demographics Median resident age: 32.9 years Median household income: $59,267 Median house value:...
Population: 2,214. Estimated population in July 2024: 2,217 (+0.1% change) Males: 1,127 (50.9%), Females: 1,087 (49.1%) Greene County Zip code: 62082 Demographics Median resident age: 32.2 years Median household income: $28,109 Median house value:...
Population: 21,153. Estimated population in July 2024: 36,396 (+72.1% change) Males: 10,658 (50.4%), Females: 10,495 (49.6%) Will County Zip code: 60446 Demographics Median resident age: 29.7 years Median household income: $60,737 Median house value:...
Population: 1,776 Males: 911 (51.3%), Females: 865 (48.7%) Peoria County Demographics Median resident age: 39.7 years Median household income: $40,962 Median house value: $80,500 Population by Race Races in Rome: White Non-Hispanic (97.4%) Hispanic...
Population: 24,604. Estimated population in July 2024: 23,909 (-2.8% change) Males: 12,452 (50.6%), Females: 12,152 (49.4%) Cook County Zip code: 60008 Demographics Median resident age: 34.4 years Median household income: $59,535 Median house value:...
Population: 5,296. Estimated population in July 2024: 5,348 (+1.0% change) Males: 2,616 (49.4%), Females: 2,680 (50.6%) Winnebago County Zip code: 61072 Demographics Median resident age: 35.3 years Median household income: $57,292 Median house value:...
Rockford, Illinois is a vibrant and diverse city located in the northern part of the state, about 90 miles northwest of Chicago. With a population of around 152,000 people, Rockford is the third-largest city...
Population: 39,684. Estimated population in July 2024: 38,702 (-2.5% change) Males: 18,745 (47.2%), Females: 20,939 (52.8%) Rock Island County Zip codes: 61201. Demographics Median resident age: 36.4 years Median household income: $34,729 Median house...
Population: 9,580. Estimated population in July 2024: 9,470 (-1.1% change) Males: 4,560 (47.6%), Females: 5,020 (52.4%) Whiteside County Zip code: 61071 Demographics Median resident age: 36.1 years Median household income: $34,442 Median house value:...
Rock City, Illinois is a small village located in the northern part of the state. The population of Rock City is approximately 1,500 people. The geography of Rock City is mostly flat and rural,...
Rochester, Illinois is located in Sangamon County and has a population of around 3,000. The city sits on the Sangamon River, which is a major feature of the landscape. The climate in Rochester is...