Place
- Kansas2
- Louisiana2
- Michigan2
- Nantucket Sound (Mass.)2
- Nevada2
- Ohio2
- Oklahoma2
- Penobscot Bay (Me.)2
- Puerto Rico2
- Rhode Island Sound (Mass. and R.I.)2
- United States Virgin Islands2
- Utah2
- Vineyard Sound (Mass.)2
- Washington (State)2
- American Samoa1
- Blue Hill Bay (Me.)1
- Boon Island (Me.)1
- Boston Harbor (Mass.)1
- California Coastal National Monument (Calif.)1
- Chesapeake Bay (Md. and Va.)1