Official results for the 1999 Sikkim Legislative Assembly election. SDF won the most seats with 23 out of 31.
Total seats: 31. Majority mark: 16.
| Party | Seats | Vote Share |
|---|---|---|
| SDF | 23 | 51.2% |
| SSP | 7 | 42.9% |
| IND | 1 | 2.0% |
| CPM | 0 | 0.2% |
| INC | 0 | 3.8% |
| Constituency | Winner | Party | Margin % |
|---|---|---|---|
| ARITHANG | MINGMA TSH. SHERPA | SSP | 30.7% |
| BARFUNG | RAN BAHADUR SUBBA | SDF | 24.5% |
| CHUJACHEN | SONAM DORJEE | SSP | 11.9% |
| DARAMDIN | ONGDEN TSHERING LEPCHA | SDF | 27.7% |
| DJONGU | TSETEN DORJEE LEPCHA | SDF | 14.4% |
| GANGTOK | DORJEE TSHERING LEPCHA | SDF | 26.0% |
| GNATHANG-MACHONG | JAI KR. BHANDARI | SSP | 0.1% |
| GYALSHING-BARNYAK | NARENDRA KUMAR SUBBA | SDF | 8.0% |
| KABI LUNGCHUK | TSETEN TASHI BHUTIA | SDF | 1.6% |
| KHAMDONG-SINGTAM | SANG DORJEE TAMANG | SSP | 2.7% |
| LACHEN MANGAN | NARENDRA KR. PRADHAN | SSP | 5.4% |
| MANEYBUNG-DENTAM | SHER BAHADUR SUBEDI | SDF | 13.4% |
| MARTAM-RUMTEK | HISHEY LACHUNGPA | SDF | 19.4% |
| MELLI | KEDAR NATH RAI | SDF | 32.1% |
| NAMCHEYBUNG | GOPAL LAMICHANEY | SDF | 20.6% |
| NAMCHI-SINGHITHANG | DORJEE DAZOM BHUTIA | SDF | 28.1% |
| NAMTHANG-RATEYPANI | PAWAN CHAMLING | SDF | 45.0% |
| RANGANG-YANGANG | CHANDRA KUMAR MOHORA | SDF | 13.2% |
| RHENOCK | KARNA BDR. CHAMLING | SDF | 2.4% |
| RINCHENPONG | TULSHI PD. PRADHAN | SDF | 6.5% |
| SALGHARI-ZOO | RAM BAHADUR SUBBA | SDF | 0.9% |
| SANGHA | PALDEN LAMA | IND | 47.6% |
| SHYARI | SONAM GYATSO LEPCHA | SSP | 3.7% |
| SOREONG-CHAKUNG | PREM SINGH TAMANG | SDF | 18.7% |
| TEMI-NAMPHING | GIRISH CHANDRA RAI | SDF | 18.2% |
| TUMEN-LINGI | GARJAMAN GURUNG | SDF | 17.7% |
| UPPER BURTUK | KARMA TEMPO NAMGYAL GYALTSEN | SDF | 2.3% |
| UPPER TADONG | THENLAY TSHERING BHUTIA | SDF | 12.9% |
| WEST PENDA | NAR BDR. BHANDARI | SSP | 13.1% |
| YANGTHANG | THUTOP BHUTIA | SDF | 11.8% |
| YOKSAM-TASHIDING | KALAWATI SUBBA | SDF | 24.3% |