The County Registrar of Voters Office may be known by a different name where you are. You should be able to easily find it easily on the internet by googling "[Name of Your County] Voters Office".

Each State of the Republic is responsible for its own election policies and procedures (Election Code) which are to be exercised and enforced uniformly in each and every county.
This is a very important and vital office and must be non-partisan which is why it is equally important to keep an eye on it and remain vigilant.