Answer:
The population of Evesham, England on December 21st 2011 is approximately 22,653. (Extrapolated from England populations of 50,760,000 on June 13th 2008, 23:11 and 51,446,000 on February 10th 2010, and a Evesham, England population of 22,304 on February 11th 2010.)