Home›1839 establishments in Illinois›Quận Jersey🌐Tiếng ViệtEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiPortuguêsSvenskaTiếng ViệtTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ490986· pop 45· linked from 1,515 articlesQuận JerseyAlso known as Jersey County, Illinois, Jersey County, ILcounty in Illinois, United StatesKey factsCountryUnited StatesStateIllinoisFoundedFebruary 28, 1839Named afterNew JerseySeatJerseyvilleLargest cityJerseyvilleTotal377 sq mi (980 km )Land369 sq mi (960 km )Water7.9 sq mi (20 km ) 2.1%Estimate 202521,160Density58.3/sq mi (22.5/km )Time zoneUTC−6 ( Central )Summer dstUTC−5 ( CDT )On the mapAvailable in 45 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoالعربيةAlbanianConnectionsIllinoisEntitySt. LouisEntityCategories1839 establishments in IllinoisIllinois countiesIllinois counties on the Mississippi RiverJersey County, IllinoisMetro EastPopulated places in the United States established in 1839