| Table ID No. | MCAG | Legal Name | Entity Name | Government Description |
| 601 | 2407 | Underwood Conservation District | Underwood Conservation District | Conservation District |
| 103 | S145 | Uniform Legislation Commission | Uniform Legislation Commission | Agency, Commission, or Board |
| 1479 | 1628 | Union Gap Irrigation District | Union Gap Irrigation District | Irrigation and Reclamation District |
| 2062 | 2104 | Union Gap School District No. 2 | Union Gap School District No 2 | School Districts |
| 474 | 0853 | City of Union Gap | Union Gap, City of | City/Town |
| 818 | 2823 | Uniontown Community Development Association | Uniontown Community Development Association | Economic/Industrial Development |
| 475 | 0829 | Town of Uniontown | Uniontown, Town of | City/Town |
| 2127 | S360 | University of Washington | University of Washington | University or College |
| 2063 | 1998 | University Place School District No. 83 | University Place School District No 83 | School Districts |
| 476 | 1021 | City of University Place | University Place, City of | City/Town |
| 602 | 2396 | Upper Grant Conservation District | Upper Grant Conservation District | Conservation District |
| 1262 | 1431 | Upper Grays River Flood Control District | Upper Grays River Flood Control District | Flood Control District |
| 1607 | 2803 | Upper Valley Parks and Recreation Service Area | Upper Valley Parks and Recreation Service Area | Park and Recreation District |
| 104 | S215 | Utilities and Transportation Commission | Utilities and Transportation Commission | Agency, Commission, or Board |