The Choctawhatchee beach mouse has a small body, haired tail, relatively large ears, and protuberant eyes. Head and body length is 2.7 to 3.5 inches; tail length is 1.7 to 2.5 inches. The upper parts are colored orange-brown to yellow-brown, the underparts are white, and the tail has a variable dorsal stripe. A nocturnal herbivore, this beach mouse probably feeds primarily on the seeds of sea oats and bunch-grass. Arthropods are eaten seasonally in spring and summer. To date, no studies on life history or ecology have been conducted on this species.