According to the 2015 Census, the age group with the highest population in Malongcay Dacu is 5 to 9, with 151 individuals. Conversely, the age group with the lowest population is 75 to 79, with 16 individuals.
Combining age groups together, those aged 14 and below, consisting of the young dependent population which include infants/babies, children and young adolescents/teenagers, make up an aggregate of 34.60% (427). Those aged 15 up to 64, roughly, the economically active population and actual or potential members of the work force, constitute a total of 58.18% (718). Finally, old dependent population consisting of the senior citizens, those aged 65 and over, total 7.21% (89) in all.
The computed Age Dependency Ratios mean that among the population of Malongcay Dacu, there are 59 youth dependents to every 100 of the working age population; there are 12 aged/senior citizens to every 100 of the working population; and overall, there are 72 dependents (young and old-age) to every 100 of the working population.
The median age of 23 indicates that half of the entire population of Malongcay Dacu are aged less than 23 and the other half are over the age of 23.
The population of Malongcay Dacu grew from 1,078 in 1990 to 1,283 in 2020, an increase of 205 people over the course of 30 years. The latest census figures in 2020 denote a positive growth rate of 0.82%, or an increase of 49 people, from the previous population of 1,234 in 2015.
Malongcay Dacu is situated at approximately 9.1852, 123.2045, in the island of Negros. Elevation at these coordinates is estimated at 321.9 meters or 1,056.1 feet above mean sea level.