Steve, I see you needed some SY names, so I knocked this one up for you. If there are any preferences for other National SY's, list them and I will provide a list of them for you.
In this list the upper ones are the SY's used by the US for military Naval construction. The lower list is for Civilian SY's that are building ships with at least a hull length of 100 feet. None are building wooden boats for the inland waterways of the US.
Company Shipyard
Avondale Industries Avondale
Bethlehem Steel Sparrows Point
Defoe
General Dynamics Bath Ironworks
Electric Boat
NASSCO
Fore River
Litton Industries Ingalls
Lockheed Shipbuilding
Newport News Newport News
New York Ship Building Camden NJ
Northrop Grumman Ship Systems Pascagoula MS
Sun [Metro] Chester PA
Todd Shipyards Seattle WA
San Pedro CA
Alameda CA
Naval Sea Systems Command Charleston NSY
Charlestown NSY
Hunters Point NSY
Long Beach NSY
Mare Island NSY
New York NSY
Norfolk NSY
Pearl Harbor NSY
Philadelphia NSY
Portsmouth NSY
Puget Sound NSY
American Civilian Shipyards
Aker Philadelphia
Alaska Ship & Dry Dock
Atlantic Marine Shipyards
Atlantic Marine Alabama
Avondale Industries, Inc.
AMFELS Inc.
Austal USA
B. & B. Boat Builders
Bay Shipbuilding
Bender Shipbuilding
Blount Boats
Bludworth Shipyard
Bollinger Shipyards, Inc.
Bollinger Calcasieu
Bollinger Gretna
Bollinger Marine Fabrication
Breaux Bros. Shipyard
C. & G. Boat Works
Cascade General
Chesapeake Shipbuilding
Cianbro Corp.
Conrad Industries
Daota Creek Industries
Derecktor Connecticut
Diversified Marine
Eastern Shipbuilding
Erie Shipbuilding
Foss Shipyards
Freeport Shipbuilding
Geo Shipyard
Gladding-Hearn Shibuilding
Gulf Craft
Gunderson
Halter Marine Group
Hope Services
Ingalls Shipbuilding
Intracoastal Iron Works
JeffBoat
Kvichak Marine
Laforce Shipyard
Leevac Industries
LeTourneau
Lockport Fabrication
Main Iron Works
Marine Builders
Mariner Industries
Marinette Marine
Martinac Shipbuilding
Master Boat Builders
Midship Marine
National Steel and Shipbuilding Company (NASSCO)
Neuville Boatworks
Newsport News Shipbuilding (NNS)
Nichols Bros. Boatbuilders
Nichols Propeller Company
Norfolk Shipbuilding & Drydock Corporation (NORSHIPCO)
North American Shipbuilding
Orange Shipbuilding
Patti Shipyard
Pequot River Shipworks
Quality Shipyard
R. & R. Marine Fabrication
Rodriguez Shipbuilding
Rozema Boat Works
SAFE Boats International
SENESCO
Signal International
Sneed Shipbuilding
Southwest Marine, Inc. (SWM) San Diego, CA
St. John's Shipbuilding
Steiner Shipyard
Swiftships
Tampa Bay Shipbuilding
Thoma-Sea Shipbuilders
Todd-led Consortium
Trinity Yachts
United States Marine
US Barge
Verret Shipyard
VT Halter Marine
Washburn & Doughty
Western TowboatCheers,
