I'm am doing a project on this city flag
Maybe try looking through the city's website? http://web.vicksburg.org/vicksburg/default.aspx
You might be able to call someone there if they don't have it posted. I'm not sure that I've heard of cities having their own flags, though.
unfornately this little port doesn't have a city flag.
sorry dude i tried for ten minutes to find it..no luck!! :(