Population
India's population at the last census was 1,027,015,247 and it is expected to pass China and become the world's most populous country by 2035. The combined population of Arunachal Pradesh, Assam, and Meghalaya is 30,052,714, just under 3% of the total population of India. Assam alone has 26,655,528 people, meaning Meghalaya has a mere 2,306,069, and Arunachal Pradesh (with a land mass more or less the equivalent of Austria) has a paltry 1,091,117 (around 0.1% of India's total).

Meghalaya and Arunachal Pradesh are among the most sparsely populated states in India, with population densities of 13.11 (the lowest of all Indian States) and 103.38 per square kilometre respectively; the country wide average is 324.85, and there is a whopping 903.37 in neighbouring West Bengal.

The biggest cities in each region are the capitals 'Guwahati in Assam (808,021), Shillong in Meghalaya (260,000) and Itanagar in Arunachal Pradesh (34,970). Technically Dispur is the capital of Assam but today it is a suburb of Guwahati.