Between 1801 and 1851, manchester's population increased by about. in the 1800s, manchester's population increased because people were moving fromareas toareas.

Manchester's population between 1801 and 1851 increased from 89,000 people to 400,000 people, which is a bit more than 4 and half times increase in population in this short time-frame.

The population of this once small town of only 10,000 people, rapidly increased after the industrialization, and people moving in large masses form the rural to the urban ares.

With this quick and big increase in population, Manchester became the third biggest city in Britain, with only London and Glasgow being bigger in size and population.

Between 1801 and 1851, Manchester's population increased by about "200,000."

In the 1800s, Manchester's population increased because people were moving from "rural" areas to "urban" areas.

Hope this helps!!!