| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Si Ban Phot | city | Phatthalung | Thailand | 7.72 | 99.88 | 209 | 10508 |
| Si Banphot | city | Phatthalung | Thailand | 7.72 | 99.88 | 209 | 10508 |
| Si Bua Ban | city | Lamphun | Thailand | 18.53 | 99.09 | 1076 | 34059 |
| Si Bua Thaung | city | Trat | Thailand | 12.47 | 102.50 | 98 | 8367 |
| Si Bun Ruang | city | Nong Bua Lamphu | Thailand | 16.97 | 102.28 | 830 | 13410 |
| Si Bun Rueang | city | Nong Bua Lamphu | Thailand | 16.97 | 102.28 | 830 | 13410 |
| Si Chiang Mai | city | Nong Khai | Thailand | 17.96 | 102.59 | 830 | 84328 |
| Si Chomphu | city | Khon Kaen | Thailand | 16.80 | 102.18 | 830 | 18627 |
| Si Chon | city | Nakhon Si Thammarat | Thailand | 8.96 | 99.90 | 22 | 11337 |
| Si Da | city | Yala | Thailand | 6.52 | 101.57 | 1669 | 20528 |
| Si Hliem | city | Tak | Thailand | 17.58 | 98.68 | 1669 | 2516 |
| Si Kak | city | Nakhon Ratchasima | Thailand | 14.88 | 101.66 | 830 | 23605 |
| Si Kara Poum | city | Surin | Thailand | 14.94 | 103.80 | 830 | 37250 |
| Si Kara Pum | city | Surin | Thailand | 14.87 | 103.70 | 830 | 30158 |
| Si Khan | city | Loei | Thailand | 16.88 | 101.86 | 830 | 3874 |
| Si Khiu | city | Nakhon Ratchasima | Thailand | 14.89 | 101.72 | 830 | 23212 |
| Si Khiu (2) | city | Nakhon Ratchasima | Thailand | 14.89 | 101.72 | 830 | 23212 |
| Si Khiu 2 | city | Nakhon Ratchasima | Thailand | 14.89 | 101.72 | 830 | 23212 |
| Si Khoraphum | city | Surin | Thailand | 14.94 | 103.80 | 830 | 37250 |
| Si Lam Thian | city | Chanthaburi | Thailand | 12.38 | 102.21 | 6 | 7160 |
| Si Lang Ka | city | Lampang | Thailand | 18.05 | 99.18 | 869 | 5662 |
| Si Long | city | Chachoengsao | Thailand | 13.48 | 100.85 | 6 | 11959 |
| Si Maha Phot | city | Prachin Buri | Thailand | 13.97 | 101.51 | 22 | 13805 |
| Si Mahosot | city | Prachin Buri | Thailand | 13.89 | 101.41 | 62 | 16732 |
| Si Moen | city | Ratchaburi | Thailand | 13.52 | 99.92 | 22 | 67359 |
| Si Mongkhon | city | Mukdahan | Thailand | 16.55 | 104.72 | 830 | 76867 |
| Si Muang Mai | city | Ubon Ratchathani | Thailand | 15.49 | 105.28 | 383 | 8046 |
| Si Mueang Mai | city | Ubon Ratchathani | Thailand | 15.49 | 105.28 | 383 | 8046 |
| Si Mun Mueang | city | Mae Hong Son | Thailand | 18.16 | 97.92 | 830 | 2235 |
| Si Nakhon | city | Sukhothai | Thailand | 17.35 | 99.99 | 121 | 12911 |
| Si Narong | city | Surin | Thailand | 14.77 | 103.87 | 830 | 12146 |
| Si Phraya | city | Chanthaburi | Thailand | 12.59 | 102.05 | 42 | 54718 |
| Si Prachan | city | Suphan Buri | Thailand | 14.62 | 100.14 | 42 | 32772 |
| Si Racha | city | Chon Buri | Thailand | 13.17 | 100.93 | 65 | 46300 |
| Si Racha Town Municipality | city | Chon Buri | Thailand | 13.17 | 100.93 | 65 | 46300 |
| Si Ratch | city | Khon Kaen | Thailand | 16.47 | 102.78 | 830 | 75301 |
| Si Rattana | city | Sisaket | Thailand | 14.79 | 104.47 | 830 | 26261 |
| Si Sa Ket | city | Sisaket | Thailand | 15.11 | 104.33 | 377 | 46758 |
| Si Saket | city | Sisaket | Thailand | 15.11 | 104.33 | 377 | 46758 |
| Si Sakhon | city | Narathiwat | Thailand | 6.23 | 101.50 | 203 | 7345 |
| Si Samrong | city | Sukhothai | Thailand | 17.16 | 99.86 | 170 | 13418 |
| Si Satchanalai | city | Sukhothai | Thailand | 17.52 | 99.76 | 203 | 27082 |
| Si Sawat | city | Kanchanaburi | Thailand | 14.60 | 99.11 | 830 | 894 |
| Si Somdet | city | Roi Et | Thailand | 16.00 | 103.49 | 830 | 25046 |
| Si Songkhram | city | Nakhon Phanom | Thailand | 17.63 | 104.25 | 830 | 10579 |
| Si That | city | Udon Thani | Thailand | 16.97 | 103.22 | 830 | 12366 |
| Si Thep | city | Phetchabun | Thailand | 15.45 | 101.07 | 180 | 9857 |
| Si Wilai | city | Bueng Kan | Thailand | 18.18 | 103.75 | 830 | 12206 |
| Siao | city | Sisaket | Thailand | 14.80 | 104.67 | 830 | 15560 |
| Siayuthia | city | Krung Thep Maha Nakhon | Thailand | 13.75 | 100.50 | 6 | 1735259 |
| Siboya | city | Krabi | Thailand | 7.90 | 98.99 | 3 | 4926 |
| Sichon | city | Nakhon Si Thammarat | Thailand | 8.96 | 99.90 | 22 | 11337 |
| Sichon | city | Prachuap Khiri Khan | Thailand | 9.00 | 99.90 | 22 | 11230 |
| Sida | city | Nakhon Ratchasima | Thailand | 15.55 | 102.57 | 830 | 17080 |
| Sieb Yuan | city | Chumphon | Thailand | 10.50 | 99.07 | 78 | 19696 |
| Sikao | city | Trang | Thailand | 7.57 | 99.34 | 249 | 8224 |
| Sikaunphum | city | Surin | Thailand | 14.87 | 103.70 | 830 | 30158 |
| Sikhio | city | Nakhon Ratchasima | Thailand | 14.89 | 101.72 | 830 | 23212 |
| Sila Lat | city | Sisaket | Thailand | 15.47 | 104.07 | 830 | 18645 |
| Sila Phet | city | Nan | Thailand | 19.11 | 100.95 | 1669 | 7712 |
| Sinakharin | city | Phatthalung | Thailand | 7.57 | 99.94 | 265 | 19668 |
| Sing | city | Sing Buri | Thailand | 14.89 | 100.40 | 22 | 62854 |
| Sing Buri | city | Sing Buri | Thailand | 14.89 | 100.40 | 22 | 62854 |
| Sing Nai | city | Uttaradit | Thailand | 17.80 | 100.35 | 830 | 3427 |
| Singburi | city | Sing Buri | Thailand | 14.89 | 100.40 | 22 | 62854 |
| Singgora | city | Songkhla | Thailand | 7.20 | 100.60 | 118 | 83299 |
| Singha Buri | city | Sing Buri | Thailand | 14.89 | 100.40 | 22 | 62854 |
| Singhanakhon | city | Songkhla | Thailand | 7.24 | 100.55 | 6 | 45648 |
| Singora | city | Songkhla | Thailand | 7.20 | 100.60 | 118 | 83299 |
| Singorra | city | Songkhla | Thailand | 7.20 | 100.60 | 118 | 83299 |
| Sip Et Sauk | city | Chachoengsao | Thailand | 13.62 | 101.14 | 19 | 39553 |
| Sirindhorn | city | Ubon Ratchathani | Thailand | 15.20 | 105.39 | 830 | 11397 |
| Sirindon | city | Ubon Ratchathani | Thailand | 15.20 | 105.39 | 830 | 11397 |
| Sirinthon | city | Ubon Ratchathani | Thailand | 15.20 | 105.39 | 830 | 11397 |
| Sisakate | city | Sisaket | Thailand | 15.11 | 104.33 | 377 | 46758 |
| Sisaket | city | Sisaket | Thailand | 15.11 | 104.33 | 377 | 46758 |
| Sisalai | city | Sisaket | Thailand | 15.34 | 104.15 | 830 | 19592 |
| Sisuk | city | Nakhon Ratchasima | Thailand | 15.68 | 102.16 | 830 | 15759 |
| Sit Tang | city | Kalasin | Thailand | 16.25 | 103.68 | 830 | 22579 |
| Sita | city | Sara Buri | Thailand | 14.53 | 100.91 | 75 | 61180 |