Jersey County, Illinois
|Jersey County, Illinois|
Location in the state of Illinois
Illinois's location in the U.S.
|Founded||February 28, 1839|
|Named for||U.S. state of New Jersey|
377.13 sq mi (977 km²)
369.27 sq mi (956 km²)
7.86 sq mi (20 km²), 2.08%
61.3/sq mi (23.7/km²)
|Time zone||Central: UTC-6/-5|
Jersey County is a county located in the U.S. state of Illinois. Jersey County is part of the St. Louis Metropolitan Area. According to the 2010 census, it has a population of 22,985, which is an increase of 6.1% from 21,668 in 2000. The county seat is Jerseyville.
According to the 2010 census, the county has a total area of 377.13 square miles (976.8 km2), of which 369.27 square miles (956.4 km2) (or 97.92%) is land and 7.86 square miles (20.4 km2) (or 2.08%) is water. Jersey County is bordered by three bodies of water: the Mississippi River to the south, the Illinois River to the west, and Macoupin Creek to the northwest.
|Climate chart (explanation)|
Typically, the county's climate reflects most Midwest areas, located in the transitional zone between the humid continental climate type and the humid subtropical climate type (Köppen Dfa and Cfa, respectively), with neither large mountains nor large bodies of water to moderate its temperature. Spring is the wettest season and produces severe weather ranging from tornadoes to snow or ice storms. Summers are hot and humid, and the humidity often makes the heat index rise to temperatures feeling well above 100 °F (38 °C). Fall is mild with lower humidity and can produce intermittent bouts of heavy rainfall with the first snow flurries usually forming in late November. Winters can be cold at times with periodic light snow and temperatures below freezing.
In recent years, average temperatures in Jerseyville have ranged from a low of 17 °F (−8 °C) in January to a high of 88 °F (31 °C) in July. The record low temperature of −25 °F (−32 °C) was recorded in January 1977 and the record high temperature of 112 °F (44 °C) was recorded in July 1954. Average monthly precipitation ranges from 1.92 inches (49 mm) in January to 4.14 inches (105 mm) in April.
Adjacent counties 
- Greene County - north
- Macoupin County - east
- Madison County - southeast
- St. Charles County, Missouri - south
- Calhoun County - west
Major highways 
- U.S. Route 67
- Illinois Route 3
- Illinois Route 16
- Illinois Route 100
- Illinois Route 109
- Illinois Route 111
- Illinois Route 267
State protected areas 
National protected areas 
- Two Rivers National Wildlife Refuge (eastern portion)
|Decennial US Census|
Jersey County lies just northeast of where the great Mississippi and Illinois rivers meet. It is the former home of the Kickapoo, Menomini, Potawatomi, and Illiniwek Confederation American Indians. The first European explorers to visit the area, Father Marquette and Louis Jolliet, arrived in 1673, where they encountered the fearsome painting of the Piasa bird. The present day Pere Marquette State Park, located near Grafton, is named in Father Marquette's honor, and a monument to him is located at the park.
Jersey County was founded on February 28, 1839, and was formed out of Greene County. The county was named for the state of New Jersey, from which many of the early settlers emigrated - which was itself named for the Channel Island of Jersey in Great Britain. The area quickly evolved into several small agricultural communities. As the area soon began to flourish, a county government was established and a courthouse was built in Jerseyville, the county seat. The present courthouse is a magnificent architectural structure that was built in 1893.
Today, while the county maintains its agricultural base, it is also within commuting distance of jobs and industry in St. Louis, Missouri and the surrounding area. A large portion of the population works outside of Jersey County and benefits from being "Near the crowd, but not in it.", the official slogan of the Jersey County Business Association's advertising campaign. The bordering rivers play an important part in Jersey County's economy by supporting agricultural producers and agribusiness, and by creating a strong tourist market. Education, manufacturing, and retail are among the county's largest industries.
As of the census of 2000, there were 21,668 people, 8,096 households, and 5,861 families residing in the county. The population density was 59 people per square mile (23/km²). There were 8,918 housing units at an average density of 24 per square mile (9/km²). The racial makeup of the county was 98.13% White, 0.53% Black or African American, 0.20% Native American, 0.25% Asian, 0.03% Pacific Islander, 0.15% from other races, and 0.70% from two or more races. 0.75% of the population were Hispanic or Latino of any race. 39.2% were of German, 14.5% American, 11.2% Irish and 11.1% English ancestry according to Census 2000. 98.3% spoke English and 1.1% Spanish as their first language.
There were 8,096 households, out of which 34.60% had children under the age of 18 living with them, 60.10% were married couples living together, 9.10% had a female householder with no husband present, and 27.60% were non-families. 23.90% of all households were made up of individuals and 11.80% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 3.05.
In the county, the population was spread out with 25.40% under the age of 18, 9.90% from 18 to 24, 27.60% from 25 to 44, 22.80% from 45 to 64, and 14.40% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 95.60 males. For every 100 females age 18 and over, there were 92.40 males.
The median income for a household in the county was $42,065, and the median income for a family was $49,666. Males had a median income of $38,771 versus $23,086 for females. The per capita income for the county was $19,581. About 5.30% of families and 7.10% of the population were below the poverty line, including 8.70% of those under age 18 and 5.70% of those age 65 or over.
Unified school districts 
- Alton Community Unit School District 11 - serves a very small portion of southern Jersey County (east of Elsah), along with northwestern Madison County.
- Greenfield Community Unit School District 10 - serves a very small portion of northeastern Jersey County (west of Kemper), along with eastern Greene County.
- Jersey Community Unit School District 100 - serves most of Jersey County, and a small portion of southern Greene County.
- Southwestern Community Unit School District 9 - serves the northeastern and southeastern portions of Jersey County, along with southwestern Macoupin County.
High schools 
Colleges and universities 
Jersey County is divided into eleven townships:
Townships by population 
2010 US Census data:
Unincorporated areas 
See also 
- "Jersey County QuickFacts". United States Census Bureau. Retrieved 2011-11-05.
- "Find a County". National Association of Counties. Retrieved 2011-06-07.
- "Census 2010 U.S. Gazetteer Files: Counties". United States Census. Retrieved 2011-11-05.
- "Monthly Averages for Jerseyville, Illinois". The Weather Channel. Retrieved 2011-01-27.
- Jersey County description & history, retrieved August 24, 2007
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
|Calhoun County||Macoupin County|
|St. Charles County, Missouri||Madison County|