The U.S. Department of Agriculture says the number of urban farmers markets has increased thanks to a greater demand for locally grown fruits and vegetables. There are now more than 78-hundred farmers markets registered with the USDA, up from 17-hundred in 1994. The department has worked to make farmers markets more accessible by outfitting some with equipment that accepts payments from government-subsidized food programs. Columbus Public Health officials yesterday launched a farmers market that will operate on Thursdays this month at their offices on Parsons Avenue.