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Nottinghamshire is a county, not a city, so is covered by several different codes.
The city of Nottingham itself has the area code of 0115 (or +44 115 from outside the UK).
The population of Nottinghamshire on December 21st 2011 is approximately 781,974. (Extrapolated from England populations of 50,760,000 on June 13th 2008, 23:11 and 51,446,000 on February 10th 2010,...