UpAlphabetical listing of Places in Ilocos Sur
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Dacag | city | Ilocos Sur | Philippines | 17.17 | 120.70 | 1669 | 2684 |
| Daclapan | city | Ilocos Sur | Philippines | 17.80 | 120.42 | 32 | 30618 |
| Daclapan Norte | city | Ilocos Sur | Philippines | 17.80 | 120.43 | 19 | 33750 |
| Daclapan Sur | city | Ilocos Sur | Philippines | 17.80 | 120.42 | 32 | 30618 |
| Dacutan | city | Ilocos Sur | Philippines | 16.95 | 120.44 | 150 | 29618 |
| Dadalaquiten | city | Ilocos Sur | Philippines | 17.89 | 120.45 | 118 | 21793 |
| Dadalaquiter | city | Ilocos Sur | Philippines | 17.89 | 120.45 | 118 | 21793 |
| Daddaay | city | Ilocos Sur | Philippines | 16.88 | 120.53 | 830 | 16957 |
| Dagdad | city | Ilocos Sur | Philippines | 16.93 | 120.63 | 2509 | 5772 |
| Dagmam | city | Ilocos Sur | Philippines | 17.12 | 120.67 | 1217 | 3504 |
| Dagupan | city | Ilocos Sur | Philippines | 17.17 | 120.48 | 68 | 51339 |
| Dain | city | Ilocos Sur | Philippines | 17.00 | 120.72 | 1669 | 5138 |
| Daing | city | Ilocos Sur | Philippines | 17.00 | 120.72 | 1669 | 5138 |
| Dakbayan sa Vigan | city | Ilocos Sur | Philippines | 17.57 | 120.39 | 16 | 93880 |
| Daklapan | city | Ilocos Sur | Philippines | 17.80 | 120.42 | 32 | 30618 |
| Dalaoa | city | Ilocos Sur | Philippines | 16.90 | 120.52 | 259 | 23045 |
| Dalawa | city | Ilocos Sur | Philippines | 16.90 | 120.52 | 259 | 23045 |
| Dalayap | city | Ilocos Sur | Philippines | 17.84 | 120.51 | 830 | 27244 |
| Daldagan | city | Ilocos Sur | Philippines | 17.19 | 120.46 | 101 | 48457 |
| Daligan | city | Ilocos Sur | Philippines | 17.07 | 120.50 | 370 | 37930 |
| Dalipey | city | Ilocos Sur | Philippines | 16.78 | 120.60 | 2860 | 4387 |
| Damachag | city | Ilocos Sur | Philippines | 17.11 | 120.46 | 59 | 47900 |
| Damacuag | city | Ilocos Sur | Philippines | 17.11 | 120.46 | 59 | 47900 |
| Damdamoeu | city | Ilocos Sur | Philippines | 16.93 | 120.58 | 3349 | 7589 |
| Dammay | city | Ilocos Sur | Philippines | 17.51 | 120.41 | 16 | 56047 |
| Danac | city | Ilocos Sur | Philippines | 16.80 | 120.55 | 1853 | 8059 |
| Danar | city | Ilocos Sur | Philippines | 17.25 | 120.44 | 59 | 35162 |
| Danuman | city | Ilocos Sur | Philippines | 17.37 | 120.47 | 68 | 35652 |
| Danuman West | city | Ilocos Sur | Philippines | 17.37 | 120.47 | 68 | 35652 |
| Dapdappig | city | Ilocos Sur | Philippines | 17.13 | 120.60 | 830 | 5404 |
| Daramangan | city | Ilocos Sur | Philippines | 17.78 | 120.47 | 65 | 54316 |
| Daramuangan | city | Ilocos Sur | Philippines | 17.78 | 120.47 | 65 | 54316 |
| Darao | city | Ilocos Sur | Philippines | 17.74 | 120.48 | 114 | 51269 |
| Darapidap | city | Ilocos Sur | Philippines | 17.20 | 120.42 | 16 | 31196 |
| Dardara | city | Ilocos Sur | Philippines | 17.77 | 120.43 | 36 | 42516 |
| Dardarat | city | Ilocos Sur | Philippines | 17.78 | 120.43 | 36 | 40593 |
| Dardarat | city | Ilocos Sur | Philippines | 16.96 | 120.44 | 124 | 26900 |
| Darnarat | city | Ilocos Sur | Philippines | 17.77 | 120.43 | 36 | 42516 |
| Dasay | city | Ilocos Sur | Philippines | 17.42 | 120.51 | 144 | 53582 |
| Dayadan | city | Ilocos Sur | Philippines | 16.92 | 120.74 | 1876 | 6307 |
| Dayangui | city | Ilocos Sur | Philippines | 17.32 | 120.51 | 75 | 25505 |
| Dayanki | city | Ilocos Sur | Philippines | 17.32 | 120.51 | 75 | 25505 |
| Dayapan | city | Ilocos Sur | Philippines | 16.92 | 120.74 | 1876 | 6307 |
| Dili | city | Ilocos Sur | Philippines | 17.04 | 120.45 | 49 | 26696 |
| Dill | city | Ilocos Sur | Philippines | 17.04 | 120.45 | 49 | 26696 |
| Dinalaoan | city | Ilocos Sur | Philippines | 17.43 | 120.48 | 82 | 51731 |
| Dinaloan | city | Ilocos Sur | Philippines | 17.43 | 120.48 | 82 | 51731 |
| Dinaratan | city | Ilocos Sur | Philippines | 17.11 | 120.53 | 830 | 33203 |
| Dinaraton | city | Ilocos Sur | Philippines | 17.11 | 120.53 | 830 | 33203 |
| Dinwedee East | city | Ilocos Sur | Philippines | 16.94 | 120.75 | 1804 | 6258 |
| Dinwiddie | city | Ilocos Sur | Philippines | 16.94 | 120.75 | 1804 | 6258 |
| Dinwide | city | Ilocos Sur | Philippines | 16.94 | 120.75 | 1804 | 6258 |
| Dirdirig | city | Ilocos Sur | Philippines | 17.31 | 120.50 | 154 | 26555 |
| Dugay-yat | city | Ilocos Sur | Philippines | 17.86 | 120.49 | 127 | 34821 |
| Dunglayan | city | Ilocos Sur | Philippines | 17.35 | 120.48 | 101 | 38095 |
| Dupay | city | Ilocos Sur | Philippines | 16.85 | 120.59 | 984 | 3460 |
| Dupey | city | Ilocos Sur | Philippines | 16.85 | 120.59 | 984 | 3460 |
| Duquis | city | Ilocos Sur | Philippines | 17.03 | 120.58 | 2509 | 3880 |
| Duyay-yat | city | Ilocos Sur | Philippines | 17.86 | 120.49 | 127 | 34821 |
| Duyayat | city | Ilocos Sur | Philippines | 17.86 | 120.49 | 127 | 34821 |
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