Below you will find information on trademarks specific to all 50 states and D.C. -- including information on registering a trademark in your state, which will put others on notice as to your ownership of legal rights to the mark. For a step-by-step guide to applying for federal trademark registration, see Registering a Trademark.
 

Alabama	Lands and Trademarks Division (Alabama Secretary of State)
Alaska	Filing an Alaska State Trademark (Alaska Dept. of Community & Economic Development)
Arizona	Tradenames and Trademarks (Arizona Secretary of State)
Arkansas	Search Trademarks (Arkansas Secretary of State)
California	Trademarks and Service Marks (California Secretary of State)
Colorado	Trademarks FAQs (Colorado Secretary of State)
Connecticut	Trade and Service Marks (Connecticut Secretary of State)
Delaware	Trademarks, Brands, and Labels (Delaware Trademark Act)
District of Columbia	Register a Business Trade Name (D.C. Government)
Florida	Trademark / Service Mark Registration [PDF] (Florida Department of State)
Georgia	Trademarks and Service Marks (Georgia Secretary of State)
Hawaii	Trade Name, Trade Mark, or Service Mark (Hawaii Dept. of Commerce & Consumer Affairs)
Idaho	Trademarks and Service Marks (Idaho Secretary of State)
Illinois	Trademark Publications and Forms (Illinois Secretary of State)
Indiana	Trademarks Information and Search (Indiana Secretary of State)
Iowa	Application for Registration of Mark [PDF] (Iowa Secretary of State)
Kansas	Trademark / Service Mark Registration [PDF] (Kansas Secretary of State)
Kentucky	Trademarks / Service Marks (Kentucky Secretary of State)
Louisiana	Application to Register Trademark [PDF] (Louisiana Secretary of State)
Maine	Marks and Trade Names (Maine Secretary of State)
Maryland	Trademarks and Service Marks (Maryland Secretary of State)
Massachusetts	About Trademarks and Service Marks (Massachusetts Secretary of State)
Michigan	Trademarks and Service Marks [PDF] (Michigan Dept. of Consumer & Industry Services)
Minnesota	Trade and Service Marks (Minnesota Secretary of State)
Mississippi	Application to Register/Renew Trade and Service Marks [PDF] (Mississippi Secretary of State)
Missouri	Trademarks and Service Marks (Missouri Secretary of State)
Montana	Application for Registration of Mark [PDF] (Montana Secretary of State)
Nebraska	Trademark / Service Mark Application [PDF] (Nebraska Secretary of State)
Nevada	Trademarks (Nevada Secretary of State)
New Hampshire	Trademark/ Service Mark Forms and Laws (New Hampshire Secretary of State)
New Jersey	Register / Renew State Trade and Service Marks (New Jersey Division of Revenue)
New Mexico	Trademarks and Service Marks (New Mexico Secretary of State)
New York	Trademark Forms and Instructions (New York Dept. of State)
North Carolina	Trademarks (North Carolina Secretary of State)
North Dakota	Trademark / Service Mark Registration (North Dakota Secretary of State)
Ohio	Trademarks / Service Marks (Ohio Secretary of State)
Oklahoma	Trademark (Oklahoma Secretary of State)
Oregon	Trade and Service Marks - Registration [PDF] (Oregon Secretary of State)
Pennsylvania	Registration of a Trademark (Pennsylvania Department of State)
Rhode Island	Trademark / Service Mark Section (Rhode Island Secretary of State)
South Carolina	Trademarks (South Carolina Secretary of State)
South Dakota	Trademarks (South Dakota Secretary of State)
Tennessee	Trademarks (Tennessee Department of State)
Texas	Trademark Forms (Texas Secretary of State)
Utah	Trademark (Utah Division of Corporations and Commercial Code)
Vermont	Trademarks (Vermont Secretary of State)
Virginia	Trademarks and Service Marks Registered in Virginia (Virginia State Corporation Commission)
Washington	Trademark Registration / Renewal [PDF] (Washington Secretary of State)
West Virginia	Trademarks and Service Marks (West Virginia Secretary of State)
Wisconsin	Trade Names and Trademarks (Wisconsin Secretary of State)
Wyoming	Trademarks (Wyoming Secretary of State)