Jefferson County
Jefferson County is a county located in east central Missouri in the United States. The county was included as the mean center of U.S. population in 1980. It is the sixth most-populous county in Missouri. As of the 2010 U.S. Census, the county’s population was 218,733. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former President Thomas Jefferson.
Jefferson County is part of the St. Louis Metro Area and consists of many of the city’s southern suburbs.
County Maps
The Jefferson County Web map is hosted and administered by the Department of the County Assessor. The link below will take you to the Jefferson County Property Viewer Web Application which is not part of the semogis.com website. This Property Viewer is maintained by the GIS staff at Jefferson County, and any questions or requests should be made to them using the contact information below.
Jefferson County Property Viewer
Contact Information
Jefferson County Assessor
gisassessor@jeffcomo.org
636-797-5041
- Wastewater System (requires login)
Supported Web Browsers:
- Google Chrome
- Microsoft Edge (does not include Edge Legacy)
- Mozilla Firefox
- Safari
(Only WebGL-enabled, 64-bit browsers are supported.)
Troubleshooting:
If you’re having trouble viewing the web maps, please consider the following.
ESRI maps require a browser that supports WebGL, which is essential for loading the maps properly. If your browser doesn’t support WebGL, you may encounter issues when accessing the maps.
To check if your browser has WebGL enabled, visit WebGL Test. (You should see a spinning cube.)
If your browser does not support WebGL, please update your browser or switch to one that does.
Thank you for your understanding.