The first census entry for Sutton upon Tern was made in 1921 where it had a total population of 512. This figure began to grow and by 1961 the population had tripled in size to 1,622 people. This can be attributed to the introduction of the National Health Service in 1948 allowing widespread use of new antibiotics and the post-war National Food Policy. All contributing to the post war baby boom. The population total has since peaked and has been slowly declining as shown in the most recent census of 2011.