&sq=&lang=&file=File:Question_book-new.svg){kind=small} | This article needs additional citations for verification. (January 2009) |
&sq=&lang=&file=File:Hornisland_231.jpg) South side of Horn Island | |
&sq=&lang=&file=File:Horn_Island_map.png) Historical map of the changing geomorphology of Horn Island | |
&sq=&lang=&file=File:USA_Mississippi_relief_location_map.svg)  Horn Island | |
| Geography | |
|---|---|
| Location | Gulf of Mexico |
| Coordinates | 30°14′N 88°40′W / 30.233°N 88.667°W |
| Archipelago | Mississippi–Alabama barrier islands |
| Administration | |
| State | Mississippi |
| County | Jackson County |
 | |
Horn Island is a long, thin barrier island off the Gulf Coast of Mississippi, south of Ocean Springs. It is one of the Mississippi–Alabama barrier islands and part of the Gulf Islands National Seashore.[1] Horn Island is several miles long, but less than a mile wide at its widest point. It occupies about 4.2 square miles (11 km2) .