Home > Population Population More about Population Estimated population in 2015: 261,750 Estimated population projection in 2026: 308,500 6th fastest growing LA in England outside of London 17% growth in population from 2005 to 2015 26% of the population in Milton Keynes is ethnic minority Age group 28 to 42 highest proportion of population in 2015 1 in every 200 people in England live in Milton Keynes Population of the new town in 1967: 60,000 Share this:TwitterFacebook