Community serial number is given to the candidates who belong to OBC caste category of different states in India.

For every subcaste under OBC,a serial number is given so that all the similar subcaste come under it.

They are available in the central list of OBC caste.

One can go through the below link to look at those serial numbers .

Central List of OBCs - National Commission for Backward Classes

http://www.ncbc.nic.in/

Thank you.