On Sunday 30 March 1851, two censuses were taken. One was the census of the entire population, and the other was the Ecclesiastical Census. This was the only census of religious attendance in England and Wales ever taken by the state; it has never been repeated.
The results were analysed by the civil servant, Horace Mann (1823-1917) and his report was published in January 1854.
It is not possible to calculate from the returns the number of people who attended worship that day. Instead, the census returns show how many attendances there were at each service (morning, afternoon and evening).
Many people will have attended more than one service and it was quite common for people to attend the service of one denomination in the morning and another in the afternoon or evening.
The census was entirely voluntary, and not every church, chapel and meeting house sent in a return. Some vicars felt that the state had no business making such an enquiry, and refused to complete the forms.
The total population was nearly 18 million. 7,261,032 attendances were recorded.