It is Aklan's largest municipality by land area and also the most sparsely populated.

In 1948, it was separated and constituted as a separate town, with the following barrios: Logohon, Singay, Balactasan, Cabangahan, Cabilawan, Pangitan, San Jose, Talimagao, Talangban, Alaminos, Catabana, Bakyang, Calicia, Mercedes, Maria Cristina, Dit-ana, Guinato-an, Tigbauan, Alas-as, Mamba, Medina, Panikyason, and Paningayan.

Madalag has a Type III climate which is relatively dry from March to May and wet for the rest of the year.

It had a total population of 17,889 persons in 2007, a reduction of .05 percent or 897 persons from the 1995 population, basically due to migration towards industrial and trade centers of the country such as Manila, Cebu, Iloilo and other highly urbanized provinces and municipalities.

Farming and home industries are the main source of livelihood among the people.

The municipality also produces fruit trees, like lanzones, rambutan, marang and commercial crops such as coconut and abaca.

The hilly and mountainous areas produce high valued forest products such as narra, acacia, and mahogany and minor product like buri, rattan, bamboo, nipa sap and firewood.

The total length of all roads types within the geographical boundaries of the municipality is 38.50 kilometers (23.92 mi) in 2011.

All barangays are accessible by roads except, Medina and Panipiason, that cannot be reach by four wheel vehicle.

Madalag has 21 primary and 8 elementary schools with a total enrollment of 2,927 pupils and 108 teachers.