DeWitt is an unincorporated community in Dinwiddie County, Virginia, United States. DeWitt is located on U.S. Route 1 6 miles northeast of McKenney. It developed in a rural area of the county devoted to plantations worked by enslaved African Americans. When completed in 1900, the Richmond, Petersburg and Carolina Railroad passed through DeWitt from Petersburg, Virginia to Ridgeway Junction. At that time, it was merged into the Seaboard Air Line.