- Jefferson County, Illinois Home Page
County Inforeport
General information about Jefferson County
Population: 40,389
Area: 571 sq. miles
County Seat: Mount Vernon
Area Code(s): 618
Time Zone: Central
- Illinois Court Records and other Resources
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Links to state and local court records, general Illinois court information, directory of courts, and online resources for courts in Illinois.
- Court Directory and Court Records Info
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Directory of court locations in Jefferson County, Illinois. Includes local links to searching court records, dockets, legal research, self help, and more.
Assessor
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Jefferson County Supervisor of Assessments
100 South 10th St., Mt. Vernon, IL 62864
Phone: (618) 244-8016 Fax: (618) 244-1499
- Clerk, Recorder, Marriage Licenses, Birth, Death and Marriage Records and Voter Information
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Jefferson County Clerk
100 South 10th St., Room 105, Mount Vernon, IL 62864
Phone (618)244-8020
- Jefferson County census information summary
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Jefferson County statistics for population, ethnicity, housing, geography and businesses. From the U.S. Census Bureau.
- Delinquent Taxes
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Jefferson County Treasurer
100 S 10th St, Room 100, Mt. Vernon, IL 62864
Phone (618) 244-8010 Ext. 8
- Tax Deed Auctions
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View Jefferson County tax deed auctions, including results of prior sales.
- C.E. Brehm Memorial Public Library District Resources
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Search library resources including genealogy records. A valid library card is required in order to access certain resources.
- Genealogy Records
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Search Jefferson County genealogy records such as cemeteries, census records, vbirth, death and marriage records, obituaries, and more.
Sheriff and Jail
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Jefferson County Sheriff's Office and Jail
911 Casey Ave., Mt Vernon, IL 62864
Phone: (618) 244-8004 Fax: (618) 244-8004
- Inmate Records
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Search Illinois Department of Corrections inmate records.
- Government Jobs
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Search Illinois state government jobs by category, agency or keyword.
- Sex Offender Records
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Search Jefferson County sex offender records.
- Sex Offenders
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Search Jefferson County registered sex offenders by address including email alerts.
- Floodplain Maps
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Search Jefferson County floodplain maps by address.
