| reference number | name | latitude | longitude |
| 1 | A&N RR bridge, Apalachicola River, Apalachicola Bay | 29.7633 | -85.0333 |
| 2 | A1A highway bridge, Loxahatchee River, Florida | 26.9467 | -80.09 |
| 3 | Abbapoola Creek entrance, Stono River, South Caroli | 32.6767 | -80.0067 |
| 4 | Abbots Meadow, Alloway Creek, New Jersey | 39.5117 | -75.4933 |
| 5 | Aberdeen, Grays Harbor, Washington | 46.9683 | -123.853 |
| 6 | Aberdeen, Scotland | 57.144 | -2.0803 |
| 7 | Absecon Channel, State Route 87 bridge, New Jersey | 39.385 | -74.425 |
| 8 | Absecon, Absecon Creek, U.S. Hwy. 30 bridge, New Je | 39.4233 | -74.5 |
| 9 | Adak Bight, Adak Island, Alaska | 51.7667 | -176.433 |
| 10 | Adams Key, south end, Biscayne Bay, Florida | 25.3967 | -80.2333 |
| 11 | Admiralty Head, Washington | 48.1667 | -122.667 |
| 12 | Adugak Islands, Umnak Island, Alaska | 52.9167 | -169.167 |
| 13 | Agnes Cove, Aialik Peninsula, Alaska | 59.7733 | -149.588 |
| 14 | Aguchik Island, Kukak Bay, Alaska | 58.29 | -154.27 |
| 15 | Aialik Bay, north end, Alaska | 59.9533 | -149.715 |
| 16 | Aialik Sill, Aialik Bay, Alaska | 59.885 | -149.718 |
| 17 | Ailinglapalap Atoll, Marshall Islands | 7.2833 | 168.75 |
| 18 | Ailuk Atoll, Marshall Islands | 10.2167 | 169.983 |
| 19 | Airy Hall Plantation, Ashepoo River, South Carolina | 32.6317 | -80.4717 |
| 20 | Akun Bay, Akun Island, Alaska | 54.2333 | -165.533 |
| 21 | Akutan Harbor, Akutan Island, Alaska | 54.1333 | -165.8 |
| 22 | Ala Spit, Washington | 48.3967 | -122.587 |
| 23 | Alameda Creek, San Francisco Bay, California | 37.595 | -122.145 |
| 24 | Alameda Naval Air Station, San Francisco Bay, Calif | 37.7933 | -122.315 |
| 25 | Alameda, California | 37.7717 | -122.298 |
| 26 | Alameda, San Francisco Bay, California | 37.7717 | -122.298 |
| 27 | Alava Bay, Alaska | 55.2333 | -131.133 |
| 28 | Albany, Hudson River, New York | 42.65 | -73.7467 |
| 29 | Albatross Anchorage, Balboa Bay, Alaska | 55.5833 | -160.617 |
| 30 | Albergottie Creek, Rt. 21 bridge, Beaufort River, S | 32.45 | -80.7317 |
| 31 | Alcan Harbor, Shemya Island, Alaska | 52.7333 | 174.067 |
| 32 | Alcatraz Island, San Francisco Bay, California | 37.8333 | -122.417 |
| 33 | Aleck Bay, Lopez Island, Washington | 48.4333 | -122.85 |
| 34 | Alert, Nunavut | 82.4919 | -62.3173 |
| 35 | Alexandria, Virginia | 38.8 | -77.0333 |
| 36 | Allanton, St. Andrew Bay, Florida | 30.03 | -85.465 |
| 37 | Allied Chemical Corp. docks, Turtle River, Georgia | 31.1833 | -81.5167 |
| 38 | Alligator Bayou, St. Andrew Bay, Florida | 30.17 | -85.755 |
| 39 | Alligator Point, St. James Island, Florida | 29.9033 | -84.4133 |
| 40 | Alligator Point, West Bay, Texas | 29.1667 | -95.1333 |
| 41 | Alligator Reef Light, Hawk Channel, Florida | 24.85 | -80.6183 |
| 42 | Allmondsville, York River, Virginia | 37.3833 | -76.65 |
| 43 | Alloway Creek, 0.8 n.mi. above entrance, New Jersey | 39.4967 | -75.5167 |
| 44 | Alloway Creek, 2.5 n.mi. above entrance, New Jersey | 39.505 | -75.4833 |
| 45 | Allston Creek, Murrells Inlet, South Carolina | 33.5317 | -79.0533 |
| 46 | Allyn, Washington | 47.3833 | -122.823 |
| 47 | Alpine, New Jersey, Hudson River, New York | 40.945 | -73.9183 |
| 48 | Alte Weser, Leuchtturm, Germany | 53.8667 | 8.1333 |
| 49 | Amak Island, Alaska | 55.4167 | -163.117 |
| 50 | Amelia City, South Amelia River, Florida | 30.5867 | -81.4633 |
| 51 | Amelia Earhart Dam, Mystic River, Massachusetts | 42.395 | -71.0767 |
| 52 | American Bay, Kaigani Strait, Alaska | 54.85 | -132.833 |
| 53 | Amityville, Great South Bay, Long Island, New York | 40.655 | -73.4183 |
| 54 | Amrum Odde, Germany | 54.7167 | 8.35 |
| 55 | Amrum, Hafen (Wittdünn), Germany | 54.6333 | 8.3833 |
| 56 | Amtrak RR. swing bridge, Hackensack River, New Jers | 40.7517 | -74.0967 |
| 57 | Amukta Island, north side, Alaska | 52.5167 | -171.233 |
| 58 | Anacortes, Guemes Channel, Washington | 48.5167 | -122.617 |
| 59 | Anacostia Bridge, Anacostia River, Washington, D.C. | 38.8667 | -77 |
| 60 | Anchor Point, Kenai Peninsula, Alaska | 59.7667 | -151.883 |
| 61 | Anchor Point, Wrangell Narrows, Alaska | 56.6333 | -132.933 |
| 62 | Anchorage, Knik Arm, Cook Inlet, Alaska | 61.2383 | -149.89 |
| 63 | Anclote Key, southern end, Florida | 28.165 | -82.8433 |
| 64 | Anderson Bay, Unalaska Island, Alaska | 53.6833 | -166.833 |
| 65 | Andreon Bay, Shuyak Island, Alaska | 58.5167 | -152.417 |
| 66 | Andrew Bay, Adak Island, Alaska | 51.9833 | -176.633 |
| 67 | Andrews Avenue bridge, New River, Fort Lauderdale, | 26.1183 | -80.145 |
| 68 | Androscoggin River entrance, Kennebec River, Maine | 43.95 | -69.8883 |
| 69 | Angel Island (west side), San Francisco Bay, Califo | 37.8667 | -122.45 |
| 70 | Angel Island, East Garrison, San Francisco Bay, Cal | 37.8633 | -122.418 |
| 71 | Anguilla Island, Gulf of Esquibel, Alaska | 55.6833 | -133.583 |
| 72 | Ankona, Indian River, Florida | 27.355 | -80.275 |
| 73 | Anna Maria Key, Bradenton Beach, Tampa Bay, Florida | 27.4967 | -82.7133 |
| 74 | Anna Maria Key, city pier, Tampa Bay, Florida | 27.5333 | -82.73 |
| 75 | Annapolis (US Naval Academy), Severn River, Marylan | 38.9833 | -76.48 |
| 76 | Annette Key, north end, Big Spanish Channel, Florid | 24.7583 | -81.39 |
| 77 | Annisquam, Lobster Cove, Massachusetts | 42.655 | -70.6767 |
| 78 | Ano Nuevo Island, California | 37.1 | -122.333 |
| 79 | Anthony Point, Sakonnet River, Narragansett Bay, Rh | 41.6383 | -71.2117 |
| 80 | Antioch, San Joaquin River, California | 38.02 | -121.815 |
| 81 | Apalachicola, Apalachicola Bay, Florida | 29.7267 | -84.9817 |
| 82 | Ape Hole Creek, Pocomoke Sound, Chesapeake Bay, Mar | 37.9667 | -75.8167 |
| 83 | Apokak Creek entrance, Alaska | 60.1333 | -162.167 |
| 84 | Apoon Mouth, Yukon River, Alaska | 63.05 | -163.383 |
| 85 | Applegate Cove, Chuginadak Island, Alaska | 52.8667 | -169.867 |
| 86 | Applegate Island, Alaska | 60.6333 | -148.167 |
| 87 | Apra Harbor, Guam | 13.4417 | 144.653 |
| 88 | Aquia Creek, Virginia | 38.4167 | -77.35 |
| 89 | Arcadia, Totten Inlet, Washington | 47.1967 | -122.938 |
| 90 | Arcata Wharf, Humboldt Bay, California | 40.85 | -124.117 |
| 91 | Arena Cove, Pacific Ocean, California | 38.9133 | -123.708 |
| 92 | Argentia, Newfoundland | 47.3 | -53.9833 |
| 93 | Aripeka, Hammock Creek, Florida | 28.4333 | -82.6683 |
| 94 | Arletta, Hale Passage, Puget Sound, Washington | 47.28 | -122.652 |
| 95 | Arno Atoll, Marshall Islands | 7.1333 | 171.7 |
| 96 | Arroyo, Puerto Rico | 17.9667 | -66.0667 |
| 97 | Artificial Island, Salem Nuclear Plant, New Jersey | 39.4617 | -75.5317 |
| 98 | Arundel Plantation, Great Pee Dee River, South Caro | 33.4833 | -79.1783 |
| 99 | Ashepoo, Ashepoo River, South Carolina | 32.7433 | -80.5567 |
| 100 | Ashepoo-Coosaw Cutoff, ICWW, Ashepoo River, South C | 32.525 | -80.4517 |