Sto. Domingo has a total land area of 5,820 hectares. It is located about eight (8) kilometers north of Vigan City. It is consisted of thirty-six (36) barangays, i.e. seven (7) urban barangays and twenty-nine (29) rural barangays. It is bounded by Magsingal on the north, by San Ildefonso and Bantay on the south and the majestic Bullagao Mountain on the east in beyond lies the Province of Abra and on the west, by the South China Sea.
The municipality is basically agricultural, in which 80% of the constituents engage in agriculture. 2,847 hectares are used for agricultural purposes. And the major crops produced are: rice, corn, sugarcane, tobacco and various vegetables. Major sources of irrigation are from rainfall and groundwater through the shallow and deep wells. Live springs can be found on the northeastern part of Barangays Lagatit, Laoingen and Nagbettedan, which is their main source of potable water and irrigation.
The St. Dominic Parish Church, the People’s Coliseum, the Municipal Plaza, the Municipal Hall and the Public Market are all situated in thePoblacion area. A total of one (1) private hospital and Seven (7) clinics are also situated in the said area.
Wholesale and retail trade is concentrated in the urban area. At present there are two (2) gasoline refilling stations, fifty-four market tiendas, one (1) fish market shade section, one (1) meat market shade section one (1) vegetable market shade section, 8 bakeshops, hundreds of sari-sari stores scattered to all the barangays, 3 commercial poultry farms, 8 metal crafts industries, 4 construction firms, 3 Lumber and Hardware Suppliers and 37 registered Multi-purpose Cooperatives.
There are two (2) Public High Schools, one (1) Private High School, twenty-three (23) Public Elementary Schools and thirty-six (36) Day Care Centers scattered in the municipality.
The municipality has a total length of 73.869 km road networks which are being maintained by the LGU with the help of the National as well as the Provincial Government It has a total number of 8 bridges.
At present, 100% of the total barangay is supplied with electricity by the Ilocos Sur Electric Cooperative.
The main transport system of the municipality is consisting of cars, jeepneys, mini-buses, tricycles, and motorcycles.
Information is received through radios, televisions, books, newspapers, magazines, seminars/workshops and the latest are the mobile/cellular phones.
Within the context of regional and provincial development, the Municipality of Sto. Domingo with its vast potentials for agriculture, had played and shall continue to function primarily as an Agricultural town. It will have secondary roles as industrial and tourism center. It shall, likewise, be retained as a small or satellite town to Vigan City, the major urban center in Northern Ilocos Sur.
The Municipal Government is currently a fourth class municipality and it hopes to be elevated to first class municipality after a ten-year period or by 2010.