MDplates.com
MDplates is a joint venture between Jordan Irazabal of Delaware, and Scott Zillmer of Maryland. The goal is to find and photograph every special organization plate that Maryland offers.
Letter: U
| Type | High | Full Name |
| UA | Plumbers & Steamfitters Local 486 | |
| UAS | 0033 | Underwater Adventure Seekers |
| UB | The University of Baltimore Alumni Association | |
| UC | 0365 | University of Maryland University College |
| UCB | University of Colorado-Boulder | |
| UCC | 0049 | Upper Chesapeake Chorus |
| UCF | 0010 | The Ulman Cancer Fund for Young Adults |
| UD | 0255 | University of Delaware |
| UEC | International Union of Elevator Constructors Local 7 | |
| UF | 0631 | University of Florida |
| UF | University of Florida Alumni Association | |
| UM | 00246 | University of Maryland Alumni |
| UMA | 0171 | University of Miami Alumni Association |
| UMD | 1607 | University of Maryland Alumni Association |
| UMI | 0161 | University of Michigan Club of Washington DC, Inc. |
| UN | 0080 | United Steam Fire Engine Company No. 3 |
| UNC | 0338 | University of North Carolina General Alumni Association |
| UP | 0113 | University of Pittsburgh Alumni |
| US | 0249 | U.S. Soccer |
| USA | United Steelworkers of America Local 9116 | |
| USC | 0069 | Carolina Alumni Association University of South Carolina |
| USL | 0115 | Greater Baltimore US Lacrosse |
| UST | 0005 | University of Santo Tomas |
| USU | 0027 | Uniformed Services University |
| USW | United Steelworkers of America Local 2609 | |
| UV | Upper Montgomery County Volunteer Fire Department | |
| UVA | 1062 | University of Virginia Alumni Association |
| UW | 0119 | Wisconsin Alumni Assoc |
| UY | 0098 | UFCW Local 400 |
