The UK’s Muslim population is about 6.5% based on the 2021 census figures cited in the sources I found, which corresponds to roughly 3.9 million people in England and Wales and about 3.9 million across the UK in related reporting.

Quick Scoop

  • England and Wales: 6.5% Muslim, or 3.87 million people.
  • UK overall: commonly reported at around 6% to 6.5% depending on the dataset and geography used.
  • The most widely cited recent census-based figure is 6.5%.

Context

That number has risen over time, and some articles note a strong increase over the last decade. The exact percentage can vary a bit depending on whether the source is referring to the UK as a whole or to England and Wales specifically.