There are 7 Diamondback Terrapin subspecies that are currently recognized:
- Northern – Malaclemys terrapin terrapin, range: Wellfleet, MA to Cape Hatteras, NC
- Carolinan – Malaclemys terrapin centrata, range: Cape Hatteras, NC to northern Florida
- Florida East Coast – Malaclemys terrapin tequesta, range: northern Florida to upper Keys
- Mangrove – Malaclemys terrapin rhizophorarum, range: Florida Keys
- Ornate – Malaclemys terrapin macrospilota, range: Florida west coast
- Mississippi – Malaclemys terrapin pileata, range: Florida panhandle to Louisiana
- Texas – Malaclemys terrapin littoralis, range: Louisiana to Texas