| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sicudasa | city | Oaxaca | Mexico | 17.22 | -97.72 | 7549 | 11346 |
| Sidar | city | Oaxaca | Mexico | 16.43 | -94.61 | 173 | 1071 |
| Siempreviva | city | Oaxaca | Mexico | 16.68 | -96.97 | 7549 | 3290 |
| Sierra Mojarra | city | Oaxaca | Mexico | 18.54 | -96.62 | 830 | 11931 |
| Siete Arroyos | city | Oaxaca | Mexico | 16.29 | -97.40 | 2509 | 5243 |
| Siete Cabrillas | city | Oaxaca | Mexico | 17.29 | -97.07 | 6965 | 2828 |
| Sigala | city | Oaxaca | Mexico | 16.48 | -97.18 | 6709 | 1767 |
| Silacayoapam | city | Oaxaca | Mexico | 17.50 | -98.14 | 5869 | 2098 |
| Silacayoapan | city | Oaxaca | Mexico | 17.50 | -98.14 | 5869 | 2098 |
| Silacayoapilla | city | Oaxaca | Mexico | 17.81 | -97.84 | 5869 | 16121 |
| Silverio la Arrocera | city | Oaxaca | Mexico | 18.08 | -96.10 | 131 | 45413 |
| Simicahua | city | Oaxaca | Mexico | 17.15 | -97.57 | 7549 | 2308 |
| Simpensar | city | Oaxaca | Mexico | 16.07 | -95.47 | 830 | 2086 |
| Sin Pensar | city | Oaxaca | Mexico | 16.07 | -95.47 | 830 | 2086 |
| Sinacahua | city | Oaxaca | Mexico | 17.15 | -97.57 | 7549 | 2308 |
| Sinai | city | Oaxaca | Mexico | 16.14 | -97.10 | 3349 | 5811 |
| Sinaxtla | city | Oaxaca | Mexico | 17.47 | -97.28 | 6837 | 2788 |
| Sindihui | city | Oaxaca | Mexico | 17.00 | -97.35 | 5249 | 3209 |
| Sinicahua | city | Oaxaca | Mexico | 17.15 | -97.57 | 7549 | 2308 |
| Siniyuva | city | Oaxaca | Mexico | 16.56 | -97.63 | 2509 | 3053 |
| Siniyuvi | city | Oaxaca | Mexico | 16.48 | -97.93 | 1230 | 12880 |
| Siniyuya | city | Oaxaca | Mexico | 16.56 | -97.63 | 2509 | 3053 |
| Sitio Santiago | city | Oaxaca | Mexico | 16.75 | -96.64 | 5249 | 13105 |
| Sitio Viejo | city | Oaxaca | Mexico | 16.70 | -94.68 | 830 | 1779 |
| Sitio de Santiago | city | Oaxaca | Mexico | 16.80 | -96.72 | 5029 | 30566 |
| Sitio de Xitlapehua | city | Oaxaca | Mexico | 16.35 | -96.53 | 5118 | 9885 |
| Sitio de las Flores | city | Oaxaca | Mexico | 16.74 | -94.90 | 830 | 1192 |
| Sitio del Palmar | city | Oaxaca | Mexico | 16.52 | -96.49 | 5206 | 1529 |
| Sitio el Palmar | city | Oaxaca | Mexico | 16.52 | -96.49 | 5206 | 1529 |