Island | ||
| Candidate | Party | Votes |
|---|---|---|
| John Koster | R | 9716 |
| Rick Larsen | D | 7922 |
| Stuart Andrews | R | 504 |
| Glen S. Johnson | NL | 287 |
San Juan | ||
| Candidate | Party | Votes |
| Rick Larsen | D | 2300 |
| John Koster | R | 1809 |
| Stuart Andrews | R | 349 |
| Glen S. Johnson | NL | 129 |
Skagit | ||
| Candidate | Party | Votes |
| John Koster | R | 11914 |
| Rick Larsen | D | 9478 |
| Stuart Andrews | R | 641 |
| Glen S. Johnson | NL | 632 |
Snohomish | ||
| Candidate | Party | Votes |
| Rick Larsen | D | 33838 |
| John Koster | R | 33081 |
| Stuart Andrews | R | 1763 |
| Glen S. Johnson | NL | 841 |
Whatcom | ||
| Candidate | Party | Votes |
| John Koster | R | 15724 |
| Rick Larsen | D | 14777 |
| Stuart Andrews | R | 1017 |
| Glen S. Johnson | NL | 523 |