| Year | Record | Finish, Division | RS | RA | Age (1=oldest) | High OPS | Low RA | Attendance | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Year 1 | 32-18 (.640) | 2nd (1 GB), Western | 260 (3/16) | 199 (T4/16) | 25.8 (3/16) | Statistics | Results | K Graham | (1.061) | C Love | (3.70) | 389,092 (3/16) |
| Year 2 | 32-18 (.640) | 1st, Western | 264 (3/16) | 197 (3/16) | 26.6 (2/16) | Statistics | Results | JD Rockefeller | (1.102) | A Robinson | (2.69) | 732,573 (2/16) |
| Year 3 | 37-13 (.740) | 1st, Western | 269 (2/16) | 175 (1/16) | 25.7 (5/16) | Statistics | Results | JD Rockefeller | (1.020) | A Robinson | (2.99) | 799,663 (4/16) |
| Year 4 | 30-20 (.600) | 1st, Western | 217 (10/16) | 178 (1/16) | 25.5 (T7/16) | Statistics | Results | K Novoselic | (0.801) | A Robinson | (3.10) | 944,584 (3/16) |
| Year 5 | 38-12 (.760) | 1st, Western | 267 (3/16) | 160 (1/16) | 25.3 (7/16) | Statistics | Results | A Bester | (0.976) | K Deal | (3.17) | 962,640 (5/16) |
| Year 6 | 31-20 (.608) | 1st, Western | 202 (11/16) | 157 (2/16) | 24.4 (T11/16) | Statistics | Results | K Novoselic | (0.848) | K Deal | (2.69) | 1,103,503 (1/16) |
| Year 7 | 34-16 (.680) | 1st, Western | 222 (8/16) | 147 (1/16) | 25.3 (7/16) | Statistics | Results | K Novoselic | (0.999) | FB Cobain | (2.37) | 1,079,871 (1/16) |
| Year 8 | 26-24 (.520) | T3rd (5 GB), Western | 189 (16/16) | 190 (4/16) | 25.4 (6/16) | Statistics | Results | K Novoselic | (0.945) | FB Cobain | (4.15) | 1,101,379 (1/16) |
| Year 9 | 26-24 (.520) | 3rd (7 GB), Western | 225 (10/16) | 191 (4/16) | 23.3 (14/16) | Statistics | Results | AB Smith IV | (1.060) | T Mars | (3.32) | 725,944 (12/16) |
| Year 10 | 26-24 (.520) | T3rd (3 GB), Western | 187 (13/16) | 185 (3/16) | 23.8 (13/16) | Statistics | Results | Maude | (0.930) | FB Cobain | (2.50) | 829,805 (7/16) |
| Year 11 | 35-15 (.700) | 1st, Western | 232 (6/16) | 153 (1/16) | 24.4 (T11/16) | Statistics | Results | Beck | (0.955) | Jewel | (2.53) | 904,896 (6/16) |
| Year 12 | 27-23 (.540) | 4th (4 GB), Western | 277 (2/16) | 226 (10/16) | 25.1 (9/16) | Statistics | Results | AB Smith IV | (1.164) | FB Cobain | (3.69) | 904,379 (6/16) |
| Year 13 | 37-13 (.740) | 1st, Western | 255 (3/16) | 159 (1/16) | 25.2 (T8/16) | Statistics | Results | Beck | (0.962) | Jewel | (2.80) | 1,148,422 (2/16) |
| Year 14 | 25-25 (.500) | 4th (7 GB), Western | 263 (3/16) | 212 (8/16) | 26.0 (5/16) | Statistics | Results | E Vedder | (0.977) | No qualifiers | 937,510 (6/16) | |
| Year 15 | 30-20 (.600) | T1st, Western | 197 (10/16) | 172 (2/16) | 25.5 (8/16) | Statistics | Results | Maude | (0.972) | Rydia | (3.31) | 918,495 (8/16) |
| Year 16 | 33-17 (.660) | 2nd (1 GB), Western | 227 (5/16) | 190 (6/16) | 25.8 (7/16) | Statistics | Results | Beck | (0.997) | Rydia | (3.52) | 999,475 (5/16) |
| Year 17 | 24-16 (.600) | 2nd (6 GB), Western | 219 (2/16) | 156 (4/16) | 25.6 (8/16) | Statistics | Results | J Hendrix | (1.056) | Rydia | (3.44) | 749,120 (6/16) |
Playoff history:
| Year 1 | Seattle defeated Brooklyn, 4-2; Seattle defeated Terra, 4-1 |
| Year 2 | Seattle defeated Brooklyn, 4-0; Seattle defeated Terra, 4-3 |
| Year 3 | Stamford defeated Seattle, 4-3 |
| Year 4 | Broadway defeated Seattle, 4-3 |
| Year 5 | Seattle defeated Kratovo, 4-0; Industry defeated Seattle, 4-2 |
| Year 6 | Seattle defeated Terra, 4-0; Seattle defeated Pittsburgh, 4-1 |
| Year 7 | Seattle defeated Brussels, 4-3; Seattle defeated Pittsburgh, 4-3 |
| Year 11 | Seattle defeated Brooklyn, 4-0; Brussels defeated Seattle, 4-1 |
| Year 13 | Terra defeated Seattle, 4-2 |
| Year 15 | Seattle defeated Terra, 4-3; Brooklyn defeated Seattle, 4-1 |
| Year 16 | Stamford defeated Seattle, 4-2 |
| Franchise single-season records: | Franchise leaders, hitting (min. 300 PA): | Franchise leaders, pitching (min. 150 IP): |
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Players who have played for Seattle (Statistics, Drafted players):