| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| Sabaan | city | Province of Ilocos Sur | Philippines | 17.094444 | 120.6955556 | 1640 | 3758 |
| Sabahganr | city | Province of Ilocos Sur | Philippines | 17.2833333 | 120.4333333 | 85 | 31043 |
| Sabangan | city | Province of Ilocos Sur | Philippines | 17.2833333 | 120.4333333 | 85 | 31043 |
| Sabangan | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.4333333 | 29 | 48847 |
| Sabangan Bato | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.4666667 | 95 | 49346 |
| Sabangan Buaya | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.4333333 | 29 | 48847 |
| Sabangan-Pingan | city | Province of Ilocos Sur | Philippines | 17.35 | 120.4833333 | 101 | 40757 |
| Sabañgan Bato | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.4666667 | 95 | 49346 |
| Sabuanan | city | Province of Ilocos Sur | Philippines | 17.1497222 | 120.4375 | 98 | 40802 |
| Sacaang | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.4666667 | 95 | 49346 |
| Sacpil | city | Province of Ilocos Sur | Philippines | 17.8 | 121.3166667 | 285 | 4347 |
| Sacuga | city | Province of Ilocos Sur | Philippines | 17.5319444 | 120.4522222 | 328 | 58129 |
| Sacuya Norte | city | Province of Ilocos Sur | Philippines | 17.5319444 | 120.4522222 | 328 | 58129 |
| Sacuyya | city | Province of Ilocos Sur | Philippines | 17.5319444 | 120.4522222 | 328 | 58129 |
| Sacuyya Norte | city | Province of Ilocos Sur | Philippines | 17.5319444 | 120.4522222 | 328 | 58129 |
| Sacuyya Sur | city | Province of Ilocos Sur | Philippines | 17.4833333 | 120.4333333 | 127 | 32500 |
| Sagat | city | Province of Ilocos Sur | Philippines | 17.0547222 | 120.4583333 | 88 | 25396 |
| Sagayaden | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.45 | 82 | 47112 |
| Sagneb | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.3833333 | 16 | 82684 |
| Sagpat | city | Province of Ilocos Sur | Philippines | 17.6 | 120.3833333 | 16 | 82684 |
| Sagsagat | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.3666667 | 19 | 24820 |
| Sal-lacong | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| Salamague | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.4166667 | 3 | 47112 |
| Salan | city | Province of Ilocos Sur | Philippines | 17.8202778 | 120.5061111 | 232 | 24653 |
| Salapasap | city | Province of Ilocos Sur | Philippines | 17.8197222 | 120.4622222 | 160 | 42855 |
| Salcedo | city | Province of Ilocos Sur | Philippines | 17.1547222 | 120.5394444 | 347 | 37864 |
| Salincob | city | Province of Ilocos Sur | Philippines | 17.2666667 | 120.4666667 | 111 | 34906 |
| Salincub | city | Province of Ilocos Sur | Philippines | 17.2666667 | 120.4666667 | 111 | 34906 |
| Salindeg | city | Province of Ilocos Sur | Philippines | 17.55 | 120.3666667 | 16 | 62243 |
| Sallacapo | city | Province of Ilocos Sur | Philippines | 17.85 | 120.4833333 | 118 | 37427 |
| Salomague | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.4166667 | 3 | 47112 |
| Salvador Primero | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Salvador Segundo | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.4833333 | 328 | 40323 |
| Salvec | city | Province of Ilocos Sur | Philippines | 17.4511111 | 120.4525 | 118 | 27230 |
| Sampalingen | city | Province of Ilocos Sur | Philippines | 17.2211111 | 120.5022222 | 82 | 25542 |
| Sampatingan | city | Province of Ilocos Sur | Philippines | 17.2211111 | 120.5022222 | 82 | 25542 |
| San Agustin | city | Province of Ilocos Sur | Philippines | 17.2166667 | 120.45 | 75 | 36480 |
| San Andres | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| San Antonio | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.45 | 62 | 25396 |
| San Antonio | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4666667 | 78 | 47768 |
| San Carlos | city | Province of Ilocos Sur | Philippines | 17.8833333 | 120.5 | 229 | 36121 |
| San Clemente de Nagtablaan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.5 | 52 | 38398 |
| San Clemente de Nagtablan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.5 | 52 | 38398 |
| San Elias | city | Province of Ilocos Sur | Philippines | 17.05 | 120.5666667 | 2296 | 13399 |
| San Emilio | city | Province of Ilocos Sur | Philippines | 17.2261111 | 120.6116667 | 1492 | 7610 |
| San Esteban | city | Province of Ilocos Sur | Philippines | 17.3263889 | 120.4472222 | 209 | 24405 |
| San Gaspar | city | Province of Ilocos Sur | Philippines | 17.15 | 120.5333333 | 104 | 37864 |
| San Ildefonso | city | Province of Ilocos Sur | Philippines | 17.6222222 | 120.3966667 | 39 | 82684 |
| San Isidro | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.4166667 | 0 | 48847 |
| San Isidro | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.4333333 | 29 | 48847 |
| San Jose | city | Province of Ilocos Sur | Philippines | 17.0983333 | 120.4991667 | 164 | 48637 |
| San Jose | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.5 | 328 | 29505 |
| San Jose de Bugnay | city | Province of Ilocos Sur | Philippines | 17.2086111 | 120.5080556 | 82 | 25542 |
| San Juan | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| San Juan | city | Province of Ilocos Sur | Philippines | 17.7422222 | 120.4583333 | 55 | 48847 |
| San Julian | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.3833333 | 16 | 92225 |
| San Julian | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.4 | 16 | 92225 |
| San Julian Norte | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.4 | 16 | 92225 |
| San Julian Sur | city | Province of Ilocos Sur | Philippines | 17.5666667 | 120.4 | 16 | 92225 |
| San Miguel | city | Province of Ilocos Sur | Philippines | 16.9333333 | 120.45 | 167 | 30053 |
| San Miguel de Poro | city | Province of Ilocos Sur | Philippines | 17.5080556 | 120.4008333 | 0 | 68022 |
| San Miguel de Puro | city | Province of Ilocos Sur | Philippines | 17.5080556 | 120.4008333 | 0 | 68022 |
| San Nicolas | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| San Nicolas | city | Province of Ilocos Sur | Philippines | 17.3166667 | 120.45 | 426 | 24405 |
| San Pablo | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.45 | 134 | 24405 |
| San Pablo | city | Province of Ilocos Sur | Philippines | 17.4166667 | 120.4666667 | 78 | 47768 |
| San Pablo | city | Province of Ilocos Sur | Philippines | 17.4333333 | 120.5333333 | 492 | 45796 |
| San Pedro | city | Province of Ilocos Sur | Philippines | 17.55 | 120.35 | 16 | 62243 |
| San Pedro | city | Province of Ilocos Sur | Philippines | 16.9525 | 120.4383333 | 150 | 30053 |
| San Pedro | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| San Pedro | city | Province of Ilocos Sur | Philippines | 17.3972222 | 120.4613889 | 36 | 47927 |
| San Pedro | city | Province of Ilocos Sur | Philippines | 17.0666667 | 120.4833333 | 131 | 38465 |
| San Pedro de Bulbuluacan | city | Province of Ilocos Sur | Philippines | 17.1333333 | 120.5 | 164 | 37864 |
| San Quintin | city | Province of Ilocos Sur | Philippines | 17.7 | 120.4333333 | 32 | 46641 |
| San Rafael | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.45 | 134 | 24405 |
| San Ramon | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.5833333 | 2358 | 9248 |
| San Roman | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.5833333 | 2358 | 9248 |
| San Roque | city | Province of Ilocos Sur | Philippines | 17.2833333 | 120.4166667 | 0 | 31043 |
| San Sebastian | city | Province of Ilocos Sur | Philippines | 17.6258333 | 120.3636111 | 19 | 24820 |
| San Sebastian Este | city | Province of Ilocos Sur | Philippines | 17.6258333 | 120.3636111 | 19 | 24820 |
| San Vicente | city | Province of Ilocos Sur | Philippines | 17.5969444 | 120.3736111 | 16 | 51713 |
| San Vicente | city | Province of Ilocos Sur | Philippines | 17.2 | 120.5333333 | 456 | 32179 |
| San Vicente | city | Province of Ilocos Sur | Philippines | 17.2666667 | 120.5333333 | 708 | 23346 |
| San Vincente | city | Province of Ilocos Sur | Philippines | 17.5969444 | 120.3736111 | 16 | 51713 |
| Sangan | city | Province of Ilocos Sur | Philippines | 17.8 | 120.4833333 | 82 | 42855 |
| Sanguspa | city | Province of Ilocos Sur | Philippines | 17.15 | 120.5333333 | 104 | 37864 |
| Santa | city | Province of Ilocos Sur | Philippines | 17.4905556 | 120.4372222 | 111 | 32500 |
| Santa Antigua | city | Province of Ilocos Sur | Philippines | 17.55 | 120.4166667 | 16 | 78350 |
| Santa Catalina | city | Province of Ilocos Sur | Philippines | 17.5966667 | 120.3591667 | 16 | 51713 |
| Santa Cruz | city | Province of Ilocos Sur | Philippines | 17.6666667 | 120.4 | 39 | 29976 |
| Santa Cruz | city | Province of Ilocos Sur | Philippines | 17.0855556 | 120.4522222 | 62 | 35098 |
| Santa Cruz | city | Province of Ilocos Sur | Philippines | 17.8738889 | 120.4802778 | 118 | 37427 |
| Santa Lucia | city | Province of Ilocos Sur | Philippines | 17.1175 | 120.4530556 | 45 | 35098 |
| Santa Maria | city | Province of Ilocos Sur | Philippines | 16.95 | 120.45 | 170 | 30053 |
| Santa Maria | city | Province of Ilocos Sur | Philippines | 17.3697222 | 120.4808333 | 29 | 40757 |
| Santa Monica | city | Province of Ilocos Sur | Philippines | 17.7 | 120.4333333 | 32 | 46641 |
| Santiago | city | Province of Ilocos Sur | Philippines | 17.2969444 | 120.4475 | 65 | 24405 |
| Santo Domingo | city | Province of Ilocos Sur | Philippines | 17.6352778 | 120.4108333 | 42 | 44749 |
| Santo Rosario | city | Province of Ilocos Sur | Philippines | 17.1 | 120.5666667 | 2329 | 16929 |
| Santo Tomas | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.4333333 | 72 | 54751 |
| Santo Tomas | city | Province of Ilocos Sur | Philippines | 17.2 | 120.45 | 39 | 40620 |
| Santo Tomas | city | Province of Ilocos Sur | Philippines | 17.1833333 | 120.5 | 164 | 32179 |
| Saoang | city | Province of Ilocos Sur | Philippines | 17.7333333 | 120.4333333 | 29 | 48847 |
| Sapang | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Sarioan | city | Province of Ilocos Sur | Philippines | 17.1236111 | 120.5386111 | 738 | 38398 |
| Sarmingan | city | Province of Ilocos Sur | Philippines | 17.4683333 | 120.5313889 | 164 | 30562 |
| Saud | city | Province of Ilocos Sur | Philippines | 17.9333333 | 120.4333333 | 0 | 13673 |
| Sevilla | city | Province of Ilocos Sur | Philippines | 17.0111111 | 120.4588889 | 75 | 25491 |
| Sibsibbe | city | Province of Ilocos Sur | Philippines | 17.2980556 | 120.5766667 | 557 | 15316 |
| Sibsibbu | city | Province of Ilocos Sur | Philippines | 17.2980556 | 120.5766667 | 557 | 15316 |
| Sibsibo | city | Province of Ilocos Sur | Philippines | 17.2980556 | 120.5766667 | 557 | 15316 |
| Sibsibu | city | Province of Ilocos Sur | Philippines | 17.2980556 | 120.5766667 | 557 | 15316 |
| Sigay | city | Province of Ilocos Sur | Philippines | 17.0452778 | 120.5794444 | 2050 | 13399 |
| Sigay | city | Province of Ilocos Sur | Philippines | 17.0833333 | 120.6 | 2050 | 5493 |
| Silag | city | Province of Ilocos Sur | Philippines | 17.3613889 | 120.5133333 | 328 | 39420 |
| Simaay | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.3833333 | 16 | 82684 |
| Simmanglay | city | Province of Ilocos Sur | Philippines | 17.6166667 | 120.3833333 | 16 | 82684 |
| Sinabaan | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.35 | 16 | 62243 |
| Sinabaan | city | Province of Ilocos Sur | Philippines | 17.6 | 120.4166667 | 16 | 72043 |
| Sinait | city | Province of Ilocos Sur | Philippines | 17.8663889 | 120.4583333 | 88 | 25726 |
| Singa | city | Province of Ilocos Sur | Philippines | 16.8833333 | 120.6 | 2864 | 5696 |
| Singlan | city | Province of Ilocos Sur | Philippines | 17.0333333 | 120.5666667 | 1968 | 9248 |
| Sisim | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.4833333 | 239 | 50916 |
| Sived | city | Province of Ilocos Sur | Philippines | 17.65 | 120.3666667 | 16 | 24820 |
| Solotsolot | city | Province of Ilocos Sur | Philippines | 17.75 | 120.4166667 | 0 | 48847 |
| Solvec | city | Province of Ilocos Sur | Philippines | 17.4511111 | 120.4525 | 118 | 27230 |
| Sopot | city | Province of Ilocos Sur | Philippines | 17.8333333 | 120.4833333 | 114 | 42855 |
| Sorioan | city | Province of Ilocos Sur | Philippines | 17.1236111 | 120.5386111 | 738 | 38398 |
| Suagayan | city | Province of Ilocos Sur | Philippines | 17.1166667 | 120.45 | 45 | 35098 |
| Subadi | city | Province of Ilocos Sur | Philippines | 17.3333333 | 120.4833333 | 226 | 32306 |
| Subec | city | Province of Ilocos Sur | Philippines | 17.5833333 | 120.35 | 16 | 62243 |
| Subec | city | Province of Ilocos Sur | Philippines | 17.5166667 | 120.4166667 | 0 | 58129 |
| Sucoc | city | Province of Ilocos Sur | Philippines | 17.6 | 120.4666667 | 656 | 42099 |
| Sucoc | city | Province of Ilocos Sur | Philippines | 17.4 | 120.5166667 | 127 | 47793 |
| Sucsucquit | city | Province of Ilocos Sur | Philippines | 17.6333333 | 120.3666667 | 19 | 24820 |
| Sugpon | city | Province of Ilocos Sur | Philippines | 16.8452778 | 120.5169444 | 564 | 19330 |
| Sulbec | city | Province of Ilocos Sur | Philippines | 17.7722222 | 120.4766667 | 114 | 50916 |
| Sulvec | city | Province of Ilocos Sur | Philippines | 17.4511111 | 120.4525 | 118 | 27230 |
| Sumagui | city | Province of Ilocos Sur | Philippines | 17.4 | 120.4833333 | 16 | 47927 |
| Sunggiam | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.4333333 | 52 | 47112 |
| Sunggian | city | Province of Ilocos Sur | Philippines | 17.7666667 | 120.4333333 | 52 | 47112 |
| Supit | city | Province of Ilocos Sur | Philippines | 17.8333333 | 120.4833333 | 114 | 42855 |
| Surngit | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.4333333 | 82 | 47112 |
| Surñgit | city | Province of Ilocos Sur | Philippines | 17.7833333 | 120.4333333 | 82 | 47112 |
| Suso | city | Province of Ilocos Sur | Philippines | 17.3602778 | 120.4641667 | 82 | 40757 |
| Suyo | city | Province of Ilocos Sur | Philippines | 16.9797222 | 120.5266667 | 328 | 21221 |
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