Jefferson County is located in the eastern portion of the state of Missouri. It is a part of the St. Louis Metropolitan Area. As of the 2020 census, the population was 226,739, making it the sixth-most populous county in Missouri. Its county seat is Hillsboro. The county was organized in 1818 and named in honor of former president Thomas Jefferson. In 1980, according to the U.S. census held that year, the county contained the mean center of U.S. population. Notably, this was the first census in which the center of population was west of the Mississippi River. More information...
According to PR-model, jeffcomo.org is ranked 278,384th in multilingual Wikipedia, in particular this website is ranked 151,314th in English Wikipedia.
The website is placed before wmca.org.uk and after thefiringline.com in the BestRef global ranking of the most important sources of Wikipedia.