Letters inviting residents to take part in the Census 2021 are arriving in the post. The once-in-a-decade survey gives the most accurate estimate of all the people and households in England and Wales and the information you give helps decide how services are planned and funded in your local area. Although Census day is on Sunday 21 March, you can complete your form now. Your letter contains a household access code that you need to complete the census online. Find out all you need to know about Census 2021