The province is classified as 2nd class and has a total land area of 3,498 square kilometers or 349,800 hectares. It is composed of 24 municipalities and 569 barangays.

The province is composed of two (2) legislative districts. The first district is composed of fourteen (14) municipalities: San Isidro, Victoria, Allen, Lavezares, Rosario, San Jose, Bobon, Lope de Vega, Mondragon, Catarman as the capital town, and four island municipalities, to wit: San Vicente, Capul, San Antonio and Biri,

The second district is composed of ten (10) municipalities: San Roque, Pambujan, Silvino Lobos, Laoang, Catubig, Las Navas, Palapag, Mapanas, Gamay, and Lapinig.

Electricity of this province is being supplied by NORSAMELCO, a non-stock, nonprofit electric cooperative created under PD 269 on October 10, 1977.

Loan was granted by NEA to NORSAMELCO for the construction of Distribution Line along Allen to Mondragon which was constructed on August 1980 by Cervel Electrical Contractor and Engineering Development Corporation of the Philippines (EDCOP) as consultant. Construction of Distribution Line was completed on August 1981 with Catarman as the first municipality to be energized.

On September 19, 1989, the 3.75 megavolts amperes transformer was installed at Brgy Dalakit, Catarman and marked the start of 24-hour services of electricity in Northern Samar.

At present, Norsamelco has three (3) substations located in Bobon, Allen, and Lao-ang

serving the 24 municipalites of Northern Samar, including its barangays and sitios.