Mo. Rev. Stat. § 115.523: Certificate of nomination to issue, when — certificate of election to issue, when.

1. As soon as possible after each primary election, each person nominated for an office at the primary election shall be issued a certificate of nomination.

2. As soon as possible after each other election, each person elected to an office at the election shall be issued a certificate of election.

3. The certificate shall be issued to each person nominated or elected by the officer responsible for accepting such person's declaration of candidacy.