Place
- Mississippi9
- Missouri9
- New Mexico9
- North Carolina9
- Santa Cruz County (Calif.)9
- South Carolina9
- Texas9
- West Virginia9
- Wisconsin9
- Alaska8
- Mali8
- Tennessee8
- Ventura County (Calif.)8
- Bahrain7
- Block Island Sound (R.I.)7
- Boston Harbor (Mass.)7
- Casco Bay (Me.)7
- Cobscook Bay (Me.)7
- Frenchman Bay (Me.)7
- Nantucket Sound (Mass.)7