According to the 2011 Census of India, Aalo had a population of approximately 20,684 residents, though this number has grown in the subsequent decade. The town boasts a relatively high literacy rate, reflecting the community's emphasis on education and development.
The demographic landscape is predominantly composed of the Galo tribe. The town is also home to members of the Adi and Memba tribes, as well as a diverse mix of government officials, military personnel, educators, and traders from other parts of India.
Religiously, Aalo is diverse. A significant portion of the indigenous population practices Donyi-Polo, an animistic faith centered on the worship of the Sun (Donyi) and the Moon (Polo). Christianity has a large and growing presence, alongside Hinduism and Buddhism. The primary languages spoken are Galo, Hindi (which serves as a major lingua franca), Assamese, and English.