California

Orange County Module Railroaders HO modular, Anaheim, CA

Los Angeles Model Railroad Society HO scale, Hawthorne, CA

East Valley Lines N scale layout of the Los Angeles N Scale Association, Los Angeles, CA

Pasadena Model Railroad Club HO Sierra Pacific Lines, Los Angeles, CA

California Southern Model Railroad Club HO, Norwalk, CA

Slim Gauge Guild Model Railroad Club HOn3, Pasadena, CA

Alameda County Central RR Society HO, O, Pleasanton, CA

Golden State Model Railroad Museum HO, N, and O, Point Richmond, CA

Roseville Roundhouse Model Railroad Club HO and N, Roseville, CA

Sacramento Model Railroad Club HO, Sacramento, CA

Sacramento Model Railroad Historical Society HO, Sacramento, CA

Sacramento Modular Railroaders HO modular, Sacramento, CA

Monterey & Salinas Valley Railroad ClubHO layout, Salinas, CA

San Diego Model Railroad Museum San Diego, CA

Highland Park Society of Model Engineers HO, San Gabriel, CA

Silicon Valley Lines Model RR Club HO, San Jose, CA

Walnut Creek Model Railroad Society Walnut Creek, CA

Connecticut

Connecticut S Gaugers modular group, CT

Valley Ntrack of Connecticut Ntrak, Oxford, CT

Florida

Largo Central Railroad live steam, Largo, FL

Suncoast Model Railroad Club HO and N, Largo, FL

AM Express Model Railroad Club N, Miami, FL

Sarasota Model Railroad Club Sarasota, FL

Idaho

Eagle Rock RR Historical Society Club modular layout, Idaho Falls, ID

Illinois

Illini Railroad Club HO, Illinois

Midwest N Pioneer Model Railroading Club N scale, Broadview, IL

Baden Powell Railroad Club HO modular layout by Boy Scouts, Downers Grove, IL

Indiana

Union Station Railroaders Association HO, Indianapolis, IN

St. Joe Valley Mode, Railroad Club HO, Mishawaka, IN

Purdue Railroad Club HO, West Lafayette, IN

Louisiana

Ark-La-Tex Modular Train Club HO modular, Shreveport, LA

Maryland

Baltimore Society of Model Engineers HO, O, Baltimore, MD

Hagerstown Model Railroad Club HO and O, Hagerstown, MD

Massachusetts

Nashua Valley Railroad Association HO, Bolton, MA

Bay State Society of Model Engineers HO, N, and O, Boston, MA

MIT's Tech Model Railroad Club HO, Cambridge, MA

South Shore Model Railway Club HO, Hingham, MA

North Shore Model Railroad Club HO, HOn3, Wakefield, MA

Worcester Central Lines HO, Worcester, MA

Michigan

Raisin Valley Model RR Club HO, Blissfield, MI

Lansing Model Railroad Club HO, Lansing, MI

Western Michigan RR Club HO, Wyoming, MI

Mississippi

Jackson Society of Model Engineers HO, N, G, O (tinplate), Jackson, MS

North East Mississippi Model RR Club HO, N, New Albany, MS

Missouri

Eastern Jackson County Mainliners HO modular, Blue Springs, MO

Mississippi Valley N Scalers N, St. Louis, MO

New Hampshire

Concord Model Railroad Club HO, Concord, NH

Nutfield Valley Railroad Club HO, Derry, NH

New Jersey

Jersey Central Ntrak N, Tinton Falls, NJ

The Model Railroad Club HO, Union, NJ

New York

The Model Railroad Club of Buffalo HO, On2, On3, Buffalo, NY

West Island Model Railroad Club HO, Farmingdale, NY

Western New York Train Masters HO, Lackawanna, NY

Albany/Saratoga Modular HO Club HO, Newtonville, NY

Genesee and Ontario Model N-Gineers Ntrak, Rochester, NY

Rochester Institute of Technology Model Railroad Club HO, Rochester, NY

Northern Westchester Model Railroaders Thornwood, NY

Rensselaer Model Railroad Society HO, Troy, NY

North Carolina

Carolina Piedmont Division 13 - N, HO & G Scale surrounding the state capital at Raleigh.

Neuse River Valley Model Railroad Club - multiscale modular club, Raleigh, NC

North Raleigh Model Railroad Club - Ntrak club in the Research Triangle Park.

Ohio

Tri-State Ntrak Ntrak, Cincinnati, OH

Lake Shore Live Steamers live steam, Kirtland, OH

Oklahoma

Claremont & Southern Model Railroad Club Tulsa, OK

Oregon

Rogue Valley Model Railroad Club Medford, OR

Pennsylvania

East Penn Traction Club trolley info and links, PA

Reading Society of Model Engineers HO, O, and 15-inch gauge live steam, Berks County, PA

Western Pennsylvania Railroad Society HO, Hickory, PA

Stiegel Valley Model Railroad Club Manheim, PA

Lower Anthracite Model Railroad Club Shanmokin, PA

Penn State Model Railroad Club HO, State College, PA

Nazareth Area Society of Model Engineers HO, O, N, S, Stockertown, PA

Rhode Island

Providence Model Railroad Club HO, Providence, RI

Tennessee

Chattanooga Area Model Railroad Club HO and Ntrak, Chattanooga, TN

Texas

El Paso & Southwestern Modular Railroad Association N, HO, S, G, El Paso, TX

Tex-N N scale modular club, Plano, TX

San Antonio Model Railroad Association N, HO, O, narrow gauge, San Antonio, TX

Fort Bend Model Railroad Club Ntrak, Sugar Land, TX

Vermont

Connecticut Valley Model Railroad Club multiscale, White River Junction, VT

Virginia

Peninsula Model Railroad Club N, Newport News, VA

Prince William Model Railroad Club Prince William County, VA

Northern Virginia Model Railroaders HO, Vienna, VA

Washington

Bellingham Society of Model Engineers HO, Bellingham, WA

Boeing Employees Model Railroad Club HO layout, Kent, WA

Wisconsin

Capitol City "N"Gineers Ntrak, Madison, WI

Society of Model Engineers Milwaukee School of Engineering, Milwaukee, WI

Machickanee & Splinter Creek Model Railroad Club HO modular and permanent, Oconto, WI

METRO Model Railroad Club Port Washington, WI

Rothschild, Schofield & Weston Model Railroad Club Rothschild, WI

Canada

Calgary Model Railway Society Calgary, Alberta

Edmonton Model Railroad Association HO, N, Edmonton, Alberta

Edmonton Society of Model Railroad Engineers Edmonton, Alberta

Ottawa Valley Associated Railroaders Ottawa, Ontario

Far North Rail Sioux Lookout, Ontario

Europe

European Train Enthusiasts national organization with local chapters

FREMO European modular railroaders

Model Electronic Railway Group electronic projects, London, England

Model Railway Club N, HO, OO, O, London, England

Club Ferroviaire of Franche-Comte model railroad club in France

traiN'ternet N scale American model railroading group in France

Modelleisenbahnclub Aachen Aachen, Germany

Slim Gauge Guild HOn3, On3, Netherlands

SLAMRA Ntrak, Sweden

Australia/New Zealand

Sydney N Scale Model Railway Club N, Sydney, Australia

Tasmanian Rail Modelers Tasmania, Australia

Garden City Model Railroad Club HO, N, OO, Christchurch, New Zealand

Internet only

Nternet N, Internet-only model railroad club

Yahoo HO Train Club