| Abbreviation | Definition |
|---|---|
| SWM | South-West Michigan |
| SWOH | SouthWest OHio |
| SWPAO | State Water Project Analysis Office (State of California) |
| SWQAC | State Water Quality Advisory Committee (Maryland) |
| SWTDD | Southwest Tennessee Development District |
| TACIS | Technical Aid to the Commonwealth of Independent States |
| TAG | Tennessee, Alabama, Georgia |
| TALON | Texas, Arkansas, Louisiana, Oklahoma, And New Mexico |
| TARABIAN | An indegene or citizen of TARABA |
| TBDR | Tennessee Birth Defects Registry |
| TC | Toledo, Columbus |
| TC | Traverse City, Michigan |
| TCCN | Texas Common Course Numbering |
| TINS | Texas Identification Number System |
| TK | Tennessee and Kentucky |
| TMC | Tamil Manila Congress |
| TMC | Thane Municipal Corporation |
| TN | ennessee |
| TN | Tennessee |
| TN | Tonbridge |