Below is a list of the members of the Sound Transit board. Except for the state secretary of transportation, all are appointed by the county executives of King, Pierce and Snohomish counties, and must be elected officials. They are not publicly elected onto the Sound Transit board, but the list below shows the date of their next election into the primary public office they hold.
| Boardmember | Elected office | Next election | e-mail address |
| Ron Sims | King County Executive | 2005 | exec.sims@metrokc.gov |
| Dave Earling | President Edmonds City Council | 2003 | spellman@ci.edmonds .wa.us |
| John Ladenberg | Pierce County Executive | 2003 | pcexecutive@co.pierce.wa.us |
| Jack Crawford | Councilmember City of Kenmore | 2005 |
jvcrawford@msn.com |
| Bob Drewel | Snohomish County Executive | 2003 (term limit) | county.executive@co.snohomish.wa.us |
| David Enslow | Councilmember City of Sumner | 2005 | denslow@ci.sumner.wa.us |
| Mary Gates | Councilmember City of Federal Way | 2003 |
maryg16321@aol.com |
| Jane Hague | Councilmember King County | 2005 | jane.hague@metrokc.gov |
| Douglas MacDonald | State Dept. of Transportation | appointed |
macdond@wsdot.wa.gov |
| Richard McIver | Councilmember City of Seattle | 2005 | richard.mciver@ci.seattle.gov |
| Chuck Mosher | Councilmember City of Bellevue | 2003 |
cmosher@ci.bellevue.wa.us |
| Greg Nickels | Mayor of Seattle | 2005 | nickelgj@ci.seattle.wa.us |
| Mark Olsen | Councilmember City of Everett | 2005 | molsen@ci.everett.wa.us |
| Julia Patterson | Councilmember King County | 2005 |
julia.patterson@metrokc.gov |
| Dwight Pelz | Councilmember King County | 2005 |
dwight.pelz@metrokc.gov |
| Kevin Phelps | Councilmember City of Tacoma | 2005 |
kphelps@cityoftacoma.org |
| Cynthia Sullivan | Chair King County Council | 2003 | cynthia.sullivan@metrokc.gov |
| Claudia Thomas | Deputy Mayor of Lakewood | 2003 |
cthomas@ci.lakewood.wa.us |