| State | Blank shield | Naming convention | Category on the Commons |
| Alabama |  | Alabama x.svg | Category:Alabama State Route shields |
| Alaska |  | Alaska x shield.svg | Category:Alaska highway shields |
| Arizona |  | Arizona x.svg | Category:Arizona State Route shields |
| Arkansas |  | Arkansas x.svg | Category:Arkansas State Highway shields |
| California |  | California x.svg | Category:California State Route shields |
| Colorado |  | Colorado x.svg | Category:Colorado road signs |
| Connecticut |  | Connecticut Highway x.svg | Category:Connecticut Route shields |
| Delaware |  | Elongated circle x.svg | Category:Elongated circular route shields |
| DC |  | DC-x.svg | Category:District of Columbia road signs |
| Florida |  | Florida x.svg | Category:Florida State Road shields |
| Georgia |  | Georgia x.svg | Category:Road signs of Georgia (U.S. state) |
| Hawaii |  | HI-x.svg | Category:Hawaii road signs |
| Idaho |  | ID-x.svg | Category:Idaho state highway shields |
| Illinois |  | Illinois x.svg | Category:Illinois Route shields |
| Indiana |  | Indiana x.svg | Category:Indiana State Road shields |
| Iowa |  | Iowa x.svg | Category:Iowa Highway Shields |
| Kansas |  | K-x.svg | Category:Kansas highway shields |
| Kentucky |  | Elongated circle x.svg | Category:Elongated circular route shields |
| Louisiana |  | Louisiana x.svg | Category:Louisiana Highway shields |
| Maine |  | Maine x.svg | Category:Maine state route shields |
| Maryland |  | MD Route x.svg | Category:Maryland state highway route markers |
| Massachusetts |  | MA Route x.svg | Category:Massachusetts Route shields |
| Michigan |  | M-x.svg | Category:Michigan state trunk line highway shields |
| Minnesota |  | MN-x.svg | Category:Minnesota State Route markers |
| Mississippi |  | Ellipse sign x.svg | Category:Circular route shields |
| Missouri |  | MO-x.svg | Category:Missouri Route shields |
| Montana |  | MT-x.svg | Category:Montana highway shields |
| Nebraska |  | N-x.svg | Category:Nebraska State Highway Shields |
| Nevada |  | Nevada x.svg | Category:Nevada State Route shields |
| New Hampshire |  | NH Route x.svg | Category:New Hampshire Route shields |
| New Jersey |  | Ellipse sign x.svg | Category:Circular route shields |
| New Mexico |  | New Mexico x.svg | Category:New Mexico State Road shields |
| New York |  | NY-x.svg | Category:New York State Route signs |
| North Carolina |  | NC x.svg | Category:North Carolina Highway Shields |
| North Dakota |  | North Dakota X.svg | Category:North Dakota Highway shields |
| Ohio |  | OH-x.svg | Category:Ohio State Route shields |
| Oklahoma[1] |  | Oklahoma State Highway x.svg | Category:Oklahoma State Highway shields |
| Oregon |  | OR x.svg | Category:Oregon Route shields |
| Pennsylvania |  | PA-x.svg | Category:Pennsylvania Route shields |
| Puerto Rico | — | — | — |
| Rhode Island |  | Rhode Island x.svg | Category:Rhode Island Route shields |
| South Carolina[1] |  | South Carolina x.svg | Category:South Carolina Highway shields |
| South Dakota |  | SD x.svg | Category:South Dakota State Highway Shields |
| Tennessee |   | Tennessee x.svg Secondary Tennessee x.svg | Category:Tennessee State Route shields |
| Texas |  
 

| Texas x.svg Texas Loop x.svg Texas Spur x.svg Texas FM x.svg Texas RM x.svg | Category:Texas State Highway shields |
| Utah |  | Utah SR x.svg | Category:Utah State Route shields |
| Vermont |  | Vermont x.svg | Category:Vermont Route shields |
| Virginia |   | Virginia x.svg (Primary) Circle sign x.svg (Secondary) | Category:Virginia road signs |
| Washington |  | WA-x.svg | Category:Washington state route shields |
| West Virginia |  | WV-x.svg | Category:West Virginia road signs |
| Wisconsin | 
 | WIS x.svg WIS County x.svg | Category:Wisconsin State Highway shields Category:Wisconsin County Highway shields |
| Wyoming |  | WY-x.svg | Category:Wyoming Highway shields |