Place
- Alberta, Canada18
- American Samoa18
- Buzzards Bay (Mass. : Bay)18
- Northern Mariana Islands18
- Penobscot Bay (Me.)18
- Santa Barbara County (Calif.)18
- Arizona17
- Delaware17
- Nevada17
- Northeastern States17
- Virginia17
- Wyoming17
- Casco Bay (Me.)16
- Florida16
- Idaho16
- Iowa16
- Maryland16
- Minnesota16
- Montana16
- Nantucket Sound (Mass.)16