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Old Cahokia Courthouse in Cahokia
Old Cahokia Courthouse in Cahokia
Location of Cahokia in St. Clair County, Illinois.
Location of Cahokia in St. Clair County, Illinois.
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Country  United States
State  Illinois
County St. Clair
 • Total 10.31 sq mi (26.70 km2)
 • Land 9.75 sq mi (25.26 km2)
 • Water 0.56 sq mi (1.44 km2)
 • Total 15,241
 • Estimate 
 • Density 1,423.15/sq mi (549.46/km2)
Time zone UTC-6 (CST)
 • Summer (DST) UTC-5 (CDT)
Area code(s) 618
FIPS code 17-10370
Wikimedia Commons Cahokia, Illinois

Cahokia was a village in St. Clair County, Illinois, United States. It was located east of the Mississippi River in the Greater St. Louis metropolitan area. As of the 2010 census, 15,241 people lived in the village, a decline from 16,391 in 2000. On May 6, 2021, the village ceased to exist, being incorporated into the new city of Cahokia Heights.

The name refers to one of the clans of the historic Illini confederacy, who met early French explorers to the region. Early European settlers named the nearby (and long-abandoned) Cahokia Mounds in present-day Madison County after the Illini clan. But the UNESCO World Heritage Site and State Historic Park was developed by the prehistoric Mississippian culture, active here from AD 900 to AD 1500. They created an extensive urban complex, the largest of the farflung Mississippian culture territory through the Mississippi and Ohio river valleys.

French Canadian colonists founded Cahokia village in 1696 as a Catholic mission. The historic Church of the Holy Family is the oldest continually active Catholic parish in the United States, as well as the oldest church west of the Allegheny Mountains. Other significant colonial and Federal-period buildings listed on the National Register of Historic Places include the Cahokia Courthouse (c. 1740, in the French Colonial style); and the Jarrot Mansion (c. 1810).


While the Europeans also named the Cahokia Mounds site to the north after the Illini group, archeologists have determined that the earthwork mounds complex was built by the Mississippian culture, an earlier, potentially unrelated indigenous people. The city site reached its peak in the 13th century and was abandoned centuries before European contact. The Cahokia Native Americans did not coalesce as a group and live in the Illinois area until closer to the time of French contact.

Col. George Rogers Clark's conference with the Indians at Cahokia - NARA - 518213
Col. George Rogers Clark's conference with the Indians at Cahokia, unknown artist, from the National Archives and Records Administration

The European association with Cahokia began over 300 years ago, with Father Pinet’s mission in late 1696 to convert the Cahokian and Tamaroa Indians to Christianity. Father Pinet and the Seminary of Foreign Missions of Quebec built a log church. It is dedicated to the Holy Family. During the next 100 years, Cahokia became one of the largest French colonial towns in the Illinois Country.

Cahokia had become the center of a large area for trading Indian goods and furs. The village had about 3,000 inhabitants and a thriving business district. The nearby town of Kaskaskia on the Mississippi became the region’s leading shipping port, and Fort de Chartres became a military and governmental command center. The 50-mile (80 km) area of land between the two cities was cultivated by farming settlers, known as habitants, whose main crop was wheat. As the area expanded, the relationship between the settlers and the Indians continued to be peaceful. Settlers were mostly Canadien migrants whose families had been in North America for a while.

In the following years, Cahokia suffered, mainly from the French loss in the French and Indian War in 1763. Defeated by Great Britain in what was an extension of the Seven Years' War in Europe, the French were forced to cede large parts of the Illinois Country to the victors. Many Cahokians fled in fear of the British, or because they wanted to live in a Catholic province, to Louisiana, where they founded new Canadien villages on the west of the Mississippi River, such as St. Louis, and Ste. Genevieve, Missouri.

The Odawa leader Pontiac was assassinated by other Indians in or near Cahokia on April 20, 1769.

In 1778, during the American Revolutionary War, George Rogers Clark set up a court in Cahokia, making Cahokia an independent city state even though it was part of the Province of Quebec. Cahokia officially became part of the United States by the Treaty of Paris in 1783. Soon after that, the 105 Cahokia "heads of household" pledged loyalty to the Continental Congress of the United States.

Later, Cahokia was named the county seat of St. Clair County. The Cahokia Courthouse acted as a United States territorial courthouse and a major political center for the next 24 years. When in 1801 St. Clair County was enlarged, Henry Harrison named the Cahokia Courthouse the legal and governmental center of a sizeable area extending to the Canada–US border. By 1814, other counties and territories had been organized, and St. Clair County was defined as its current size. The county seat was moved to Belleville, Illinois.


Cahokia is located at 38°33′43″N 90°10′22″W / 38.561901°N 90.172878°W / 38.561901; -90.172878.

According to the 2010 census, Cahokia has a total area of 9.9 square miles (25.64 km2), of which 9.4 square miles (24.35 km2) (or 94.95%) is land and 0.5 square miles (1.29 km2) (or 5.05%) is water.


Historical population
Census Pop.
1880 211
1930 286
1940 465 62.6%
1950 794 70.8%
1960 15,829 1,893.6%
1970 20,649 30.5%
1980 18,904 −8.5%
1990 17,550 −7.2%
2000 16,391 −6.6%
2010 15,241 −7.0%
2019 (est.) 13,880 −8.9%
U.S. Decennial Census

As of the census of 2000, there were 16,391 people, 5,693 households, and 4,252 families residing in the village. The population density was 1,705.8 people per square mile (658.5/km2). There were 6,213 housing units at an average density of 646.6 per square mile (249.6/km2). The racial makeup of the village was 58.28% White, 38.69% African American, 0.32% Native American, 0.38% Asian, 0.03% Pacific Islander, 0.73% from other races, and 1.56% from two or more races. Hispanic or Latino of any race were 2.25% of the population.

There were 5,693 households, out of which 41.2% had children under the age of 18 living with them, 43.2% were married couples living together, 25.7% had a female householder with no husband present, and 25.3% were non-families. 20.9% of all households were made up of individuals, and 8.6% had someone living alone who was 65 years of age or older. The average household size was 2.84 and the average family size was 3.27.

In 2010, the population dropped to 15,241, with 61.30% being African American and 34.5% of the population being white alone.

In the village, the population was spread out, with 33.4% under the age of 18, 8.7% from 18 to 24, 29.4% from 25 to 44, 16.9% from 45 to 64, and 11.6% who were 65 years of age or older. The median age was 31 years. For every 100 females, there were 88.7 males. For every 100 females age 18 and over, there were 82.5 males.

The median income for a household in the village was $31,001, and the median income for a family was $35,582. Males had a median income of $31,806 versus $22,429 for females. The per capita income for the village was $14,545. About 22.8% of families and 24.9% of the population were below the poverty line, including 37.0% of those under age 18 and 5.3% of those age 65 or over.


Cahokia is home to the St. Louis Downtown Airport, a general aviation facility.

Metro operates the #2 bus route to East St. Louis, Illinois where connections can be made to the MetroLink light rail to St. Louis


  • Cahokia Unit School District 187 operates public schools.

Notable people

  • Well Hungarians – country and rock band
  • Terron Armstead - NFL player

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