You asked

Can you please send me the population for every postcode district in England and Wales. Can I have it in Excel format please?

We said

The information you have requested has been published as Table KS101EW and is available to download from the Nomis website. However, for your convenience, we have provided the required figures in the attached Excel spreadsheet. The population estimates are based on data from the 2011 Census and refer to the usual resident population on census day, 27th March 2011. A usual resident is anyone, who on census day, was in the UK and had stayed or intended to stay in the UK for a period of 12 months or more, or had a permanent UK address and was outside the UK and intended to be outside the UK for less than 12 months. Please note steps have been taken by the Office for National Statistics to protect the confidentiality of personal information.

If you require further information from the 2011 Census this may be accessed from the Nomis website or by contacting the Census Customer Services Team at census.customerservices@ons.gov.uk