Or you can go to MSDEQ website............
https://geology.deq.ms.gov/floodmaps/in the top left corner click on MS-NFHL (Mississippi National Flood Hazard Layer)
then click Launch Map Viewer
you can zoom into areas or exact addresses...........with the tool menu on the right you can click on any point
and get the lidar generated ground elevation...........this is the same data that DanP and others mentioned but access without an ArcGis license.