Arenivaga floridensis (Florida sand cockroach) is a fossorial insect restricted to scrub and sandhill communities on ancient ridges in peninsular Florida. Ecologically insular by nature, these ridge communities have experienced further fragmentation and significant reduction following conversion to citrus agriculture and subsequent urbanization. To assess the status of A. floridensis, we updated its known distribution by conducting an extensive field survey of scrub and sandhill habitats throughout the state. Roaches (n = 325) were collected at 47 localities, confirming the species' continued presence in nine out of eleven counties from which it has been reported, and providing 28 new localities for these nine counties. Moreover, we discovered 15 new populations representing six additional counties for which A. floridensis has either never been recorded (Gilchrist, Indian River, Martin, Palm Beach, and St. Lucie counties) or had records published (Orange County). We collected Arenivaga on 11 named peninsular ridges, including one major (Atlantic Coastal) and three minor (Bell, Gordonville, Orlando) ridges on which this species had not been previously reported. The nine new localities on the Atlantic Coastal Ridge constitute a significant range extension for A. floridensis, making it the most broadly distributed species of Florida's endemic ridge fauna.