I contacted the Conservation Dept about two years ago to maybe hunt them. Most of the population was mostly around the Rolla area, in the Mark Twain National Forest. The officer I spoke with said most of the hogs had already been shot out. Only a small number of them remain, but didn't expand on anything other than that. I ended up not going since he said they were getting so few and very hard to find. If you contact the Mo. Dept of conservation, they will send you a packet on where you can findthem and all the info about them.

here's a link http://mdc.mo.gov/landown/wild/nuisance/hogs/huntingtips.htm

good luck