| Abbreviation | Definition |
|---|---|
| SHY | Shinyanga, Tanzania |
| SHZ | Seshute's, Lesotho |
| SIA | Xi An, Mainland China |
| SIB | Sibiti, Congo |
| SIC | Sinop, Turkey |
| SID | Sal, Cape Verde Islands |
| SIE | Sines, Portugal |
| SIF | Simra, Nepal |
| SIG | Isla Grande, Puerto Rico |
| SIH | Silgadi Doti, Nepal |
| SII | Sidi Ifni, Morocco |
| SIJ | Siglufjordur, Iceland |
| SIK | Sikeston, Missouri USA |
| SIL | Sila, Papua New Guinea |
| SIM | Simbai, Papua New Guinea |
| SIN | Singapore, Singapore |
| SIO | Smithton, Tasmania, Australia |
| SIP | Simferopol, Ukraine |
| SIQ | Singkep, Indonesia |
| SIR | Sion, Switzerland |