Jefferson County Seal
Jefferson County,
Est. 1818
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Jefferson County, Missouri, Executive





Dennis Gannon, County Executive


Mailing Address:  

PO Box 100

Hillsboro, MO 63050

Phone:  636-797-5400

Fax:       636-797-5506


Physical Address: 

Jefferson County Administration Center

729 Maple Street, Suite G30
Hillsboro, MO 63050

Office Hours:       

8:00 a.m. to 5:00 p.m.

Monday - Friday




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