W. Va. Code § 3-2-15: Special procedures relating to agency registration at marriage license offices.

When a qualified voter appears in person to apply for a marriage license, the applicant shall be presented a voter registration application. If the applicant does not intend to change his or her legal name or residence address upon marriage, the applicant may immediately apply to register or to update a previous registration, in accordance with the procedures prescribed in section fourteen of this article, except that the completed applications shall be forwarded directly to the registration office of the clerk of the county commission if the residence given is within the same county. If the applicant does intend to change his or her legal name or residence address upon marriage, and desires to register to vote, the applicant shall instead be given a mail registration card for use after the change of name or address has occurred.