| Abbreviation | Definition |
|---|---|
| TYL | Tyler, Texas |
| TZA | Threshold Zoning Analysis |
| TZAM | Threshold Zoning Analysis Manual |
| U | Upper |
| UAC | Unemployment Action Center |
| UAC | Utah Association of Counties |
| UAP | Underserviced Areas Program |
| UCA | Union Council Administration |
| UCC | Utilities Coordinating Committee |
| UCCA | Uniform City Court Act |
| UCHD | Ulster County Health Department |
| UCHD | Union County Health Department |
| UCHD | Union County Highway Department |
| UCHD | Utah County Health Department |
| UCN | Uniserv Council of Nevada |
| UCP | United Conservative Party |
| UDAA | Urban Development Administration Authority |
| UDC | Unified Development Code |
| UDC | Upper Division Clerk |
| UDFCD | Urban Drainage and Flood Control District (Colorado) |