The Japanese government will be conducting a Census on October 1, 2020.
The Census is the most important statistical survey and is held once every five years.
The results of the Census will be used for measures such as city planning to make life easier for foreign residents.
The Census covers everyone that has lived or plans to live in Japan for more than three months, regardless of nationality. Everyone that is covered is legally obliged to respond, so please be sure to do so.
Your responses will only be used to create statistics and will not be used in any way for immigration control, police investigations, or other such purposes.
You can also respond to the Census online. Online Response Period (Monday, Sept 14 to Wednesday, Oct 7)

When the Census survey documents arrive at your home, access the Response Site, and follow the instructions on the screen to respond to the Census. Please use the internet to make your responses.
To respond, you will require the “Login ID” and “Access Key” noted in the “Online Response Guide” which you will find in the “Census Survey Document Envelope” that is distributed to you.