66.3% of North Sumatra's population is Muslim.

The Directorate General of Population and Civil Registration (Dukcapil) of the Ministry of Home Affairs (Kemendagri) recorded that the population of North Sumatra was 15.18 million as of June 30, 2021. Of this number, 10.06 million or 66.3% are Muslim.

4.08 million or 26.9% of the total population of North Sumatra are Christian. 653,810 or 4.31% of the total population in North Sumatra are Catholic.

Furthermore, 356,840 or 2.35% of the population in the province with its capital in Medan are Buddhist. The population of North Sumatra who are Hindu is 16,080 or 0.11% of the total population.

5,230 or 0.03% of the North Sumatra population adhere to indigenous beliefs. Meanwhile, only 738 residents of North Sumatra are Confucians.

Based on gender, 7.61 million (50.13%) of the North Sumatra population are male. Meanwhile, there are 7.57 million (49.87%) residents in the province who are female.

The number of North Sumatra's population according to the 2020 Population Census results reached 14.8 million. The details are 7.42 million (50.15%) male and 7.38 million (49.85%) female.

North Sumatra is one of the provinces on the island of Sumatra with an area of 72,980 square kilometers. North Sumatra has 25 regencies, 8 cities, 5,415 villages, and 693 urban villages.