I've renumbered the list to count the lighthouses with same/similar names.
[Be thinking why two very different looking lighthouses sharing a name would both qualify to be on the list.]
1. Nauset Beach 2. Wisconsin Point 3/4. Michigan City Pier Light and Old Michigan City 5. Kennebec River (Doubling Point) 6. Tillamook Rock 7. Montauk Point 8. Point Hueneme, CA 9. Assateague 10. Lightship Nantucket 11/12. Yaquina Bay (& Yaquina Head) Good One! WVsister 13. Minnesota Point 14. Ocracoke (WVlights0) (Corrected Credit) 15. Mobile Bay 16. Umpqua River (Weasel58) 17. Cuttyhunk MA (WVsister) 18. Scituate MA 19. Cape Hatteras (WVlights0) 20. Monomoy Point MA 21. Biloxi MS 22. Monhegan Island (wvLights0) 23. West Quoddy Head ME 24/25. Roanoke River and Roanoke Marshes (Weasel58) 26. Pensacola FL (wvlights0) 27. Pemaquid ME 28. Chequamegon Point WI 29. Tchefuncte River (Weasel 58) 30. Conneaut West Breakwater OH 31. Currituck Beach (wvlights0) 32. Waugoshance MI (WVsister) 33. Mystic CT 34. Old Mackinac Point MI (Docsweetie by Avatar) 35. Anacapa Island CA 36. Ontonagon MI (WVsister) 37. Seguin Island ME (WVsister) 38. Pass Manchac LA (Weasel58) 39. Lightship Chesapeake 40. Lightship Umitilla (Weasel58) 41. Chesapeake Texas Tower (wvLights0) 42/43. Milwaukee Breakwater & Milwaukee Pierhead WI 44. Mukilteo WA (Weasel58) 45. Lightship Huron (docsweetie -- Yeah Carol!) 46. Cheboygan MI (down the road from Presque Isle) 47. Tinicum NJ (wvsister) 48/49. Chicago Harbor and Chicago Southwest Guidewall IL 50. Manhattan Range OH