| Year | League | Division | Wins | Losses | Ties | PCT. | Finish | AVG. | ERA | Manager | Ballpark |
| 1977 | AL | West | 64 | 98 | 0 | .395 | 6 | .256 | 4.83 | Darrell Johnson | Kingdome |
| 1978 | AL | West | 56 | 104 | 0 | .350 | 7 | .248 | 4.67 | Darrell Johnson | Kingdome |
| 1979 | AL | West | 67 | 95 | 0 | .414 | 6 | .269 | 4.58 | Darrell Johnson | Kingdome |
| 1980 | AL | West | 59 | 103 | 1 | .364 | 7 | .248 | 4.38 | Darrell Johnson Maury Wills |
Kingdome |
| 1981 | AL | West | 44 | 65 | 1 | .404 | 6 | .251 | 4.23 | Maury Wills Rene Lachemann |
Kingdome |
| 1982 | AL | West | 76 | 86 | 0 | .469 | 4 | .254 | 3.88 | Rene Lachemann | Kingdome |
| 1983 | AL | West | 60 | 102 | 0 | .370 | 7 | .240 | 4.12 | Rene Lachemann Del Crandall |
Kingdome |
| 1984 | AL | West | 74 | 88 | 0 | .457 | 5 | .258 | 4.31 | Del Crandall Chuck Cottier |
Kingdome |
| 1985 | AL | West | 74 | 88 | 0 | .457 | 6 | .255 | 4.68 | Chuck Cottier | Kingdome |
| 1986 | AL | West | 67 | 95 | 0 | .414 | 7 | .253 | 4.65 | Chuck Cottier Marty Martinez Dick Williams |
Kingdome |
| 1987 | AL | West | 78 | 84 | 0 | .481 | 4 | .272 | 4.49 | Dick Williams | Kingdome |
| 1988 | AL | West | 68 | 93 | 0 | .422 | 7 | .257 | 4.15 | Dick Williams Jim Snyder |
Kingdome |
| 1989 | AL | West | 73 | 89 | 0 | .451 | 6 | .257 | 4.00 | Jim Lefebvre | Kingdome |
| 1990 | AL | West | 77 | 85 | 0 | .475 | 5 | .259 | 3.69 | Jim Lefebvre | Kingdome |
| 1991 | AL | West | 83 | 79 | 0 | .512 | 5 | .255 | 3.79 | Jim Lefebvre | Kingdome |
| 1992 | AL | West | 64 | 98 | 0 | .395 | 7 | .263 | 4.55 | Bill Plummer | Kingdome |
| 1993 | AL | West | 82 | 80 | 0 | .506 | 4 | .260 | 4.20 | Lou Piniella | Kingdome |
| 1994 | AL | West | 49 | 63 | 0 | .438 | 3 | .269 | 4.99 | Lou Piniella | Kingdome |
| 1995 | AL | West | 79 | 66 | 0 | .545 | 1 | .276 | 4.50 | Lou Piniella | Kingdome |
| 1996 | AL | West | 85 | 76 | 0 | .528 | 2 | .287 | 5.21 | Lou Piniella | Kingdome |
| 1997 | AL | West | 90 | 72 | 0 | .556 | 1 | .280 | 4.79 | Lou Piniella | Kingdome |
| 1998 | AL | West | 76 | 85 | 0 | .472 | 3 | .276 | 4.95 | Lou Piniella | Kingdome |
| 1999 | AL | West | 79 | 83 | 0 | .488 | 3 | .269 | 5.24 | Lou Piniella | Kingdome / Safeco Field |
| 2000 | AL | West | 91 | 71 | 0 | .562 | 2 | .269 | 4.50 | Lou Piniella | Safeco Field |
| 2001 | AL | West | 116 | 46 | 0 | .716 | 1 | .288 | 3.54 | Lou Piniella | Safeco Field |
| 2002 | AL | West | 93 | 69 | 0 | .574 | 3 | .275 | 4.07 | Lou Piniella | Safeco Field |
| 2003 | AL | West | 93 | 69 | 0 | .574 | 2 | .271 | 3.76 | Bob Melvin | Safeco Field |
| 2004 | AL | West | 63 | 99 | 0 | .389 | 4 | .270 | 4.76 | Bob Melvin | Safeco Field |
| 2005 | AL | West | 69 | 93 | 0 | .426 | 4 | .256 | 4.49 | Mike Hargrove | Safeco Field |
| 2006 | AL | West | 78 | 84 | 0 | .481 | 4 | .272 | 4.60 | Mike Hargrove | Safeco Field |
| 2007 | AL | West | 88 | 74 | 0 | .543 | 2 | .287 | 4.73 | Mike Hargrove John McLaren |
Safeco Field |
| 2008 | AL | West | 61 | 101 | 0 | .377 | 4 | .265 | 4.73 | John McLaren Jim Riggleman |
Safeco Field |
| 32 Seasons | 2376 | 2683 | 2 | .470 | |||||||