Official results for the 1999 Arunachal Pradesh Legislative Assembly election. INC won the most seats with 52 out of 59.
Total seats: 59. Majority mark: 30.
| Party | Seats | Vote Share |
|---|---|---|
| INC | 52 | 51.8% |
| NCP | 4 | 8.7% |
| IND | 2 | 11.9% |
| AC | 1 | 16.7% |
| AJBP | 0 | 0.1% |
| BJP | 0 | 10.8% |
| Constituency | Winner | Party | Margin % |
|---|---|---|---|
| ALONG EAST | KITO SORA | INC | 7.5% |
| ALONG WEST | KENTO ETE | INC | 30.7% |
| BAMENG | MEKUP DOLO | IND | 13.3% |
| BASAR | SRI EKEN RIBA | INC | 3.8% |
| BOMDILA | Shri Japu Deru | INC | 6.4% |
| BORDUMSA - DIYUN | C. C. SINGPHO | INC | 5.8% |
| BORDURIA BOGAPANI | LOWANGCHAWANGLAT | INC | 0.3% |
| CHANGLANG NORTH | THINGHAAP TAIJU | INC | 13.6% |
| CHANGLANG SOUTH | PHOSUM KHIMHUN | INC | 20.1% |
| CHAYANG TAJO | KAMENGDOLO | INC | 20.9% |
| CHOWKHAM | CHOW INDRAJIT NAMCHOOM | IND | 15.2% |
| DAMBUK | RODINGPERTIN | INC | 20.6% |
| DAPORIJO | TADAK DULOM | INC | 18.8% |
| DIRANG | TSERING GYURME | INC | 19.8% |
| DOIMUKH | SHRI T.C. TELI | INC | 13.1% |
| DUMPORIJO | TAKAR MARDE | INC | 23.3% |
| HAYULIANG | KALIKHOPUL | INC | 79.0% |
| ITANAGAR | SHRI LICHI LEGI | INC | 11.4% |
| KALAKTANG | SHRI D.K.THONGDOK | INC | 4.5% |
| KANUBARI | NEWLAI TINGKHATRA | INC | 20.9% |
| KHONSA EAST | T.L.RAJ KUMAR | INC | NaN% |
| KHONSA WEST | THAJAMABOH | INC | 9.0% |
| KOLORIANG | KAHFA BENGIA | INC | 95.3% |
| LEKANG | CHOWNA MEIN | INC | 7.4% |
| LIKABALI | Dr RIMA TAIPODIA | INC | 2.5% |
| LIROMOBA | Lijum Ronya | INC | 20.8% |
| LONGDING PUMAO | TINGPONG WANGHAM | INC | 10.2% |
| LUMLA | T.G.RINPOCHE | INC | 12.1% |
| MARIYANG-GEKU | KABANG BORANG | INC | 5.0% |
| MEBO | LOMBO TAYENG | INC | 19.0% |
| MECHUKA | TADIK CHIJE | INC | 27.1% |
| MIAO | SAMCHOM NGEMU | INC | 3.5% |
| MUKTO | DORJEE KHANDU | INC | 13.8% |
| NACHO | Tanga Byaling | INC | 14.7% |
| NAMPONG | SETONGSENA | INC | 0.3% |
| NAMSAI | C.P.NAMCHOOM | INC | 38.9% |
| NAMSANG | Wangki Lowang | NCP | 4.4% |
| NARI-KOYU | TAKODABI | INC | 36.1% |
| NYAPIN | TATAR KIPA | INC | 37.7% |
| PAKKE KESSANG | DERA NATUNG | INC | 7.2% |
| PALIN | TAKAM SANJOY | INC | 66.7% |
| PANGIN | TANYONG TATAK | INC | 11.3% |
| PASIGHAT EAST | NINONG ERING | INC | 18.0% |
| PASIGHAT WEST | TANGORTAPAK | INC | 19.0% |
| PONGCHAU WAKKA | ANOK WANGSA | NCP | 4.8% |
| RAGA | SHRI TALO MUGLI | INC | 27.3% |
| ROING | MUKUT MITHI | INC | NaN% |
| RUMGONG | Tamiyo Taga | INC | 18.7% |
| SAGALEE | NABAM TUKI | INC | 59.1% |
| SEPPA EAST | ATUM WELLY | NCP | 6.5% |
| SEPPA WEST | HARI NOTUNG | INC | 15.0% |
| TALI | TAKAM SORANG | INC | 30.4% |
| TALIHA | Nyato Rigia | INC | 9.3% |
| TAWANG | THUPTEN TEMPA | INC | NaN% |
| TEZU | NAKUL CHAI | INC | 2.5% |
| THRIZINO-BURAGAON | NARESH GLOW | INC | 1.1% |
| TUTING YINGKIONG | GEGONG APANG | AC | 21.3% |
| YACHULI | SHRI JOTAM TOKO TAKAM | NCP | 5.2% |
| ZIRO HAPOLI | PADIRICHO | INC | 26.4% |