Notary services, for signatures only, is available at these Clerk locations. The Marriage License Department is here to answer your questions concerning obtaining a marriage license in Hillsborough County.The Register of Deeds office is the official grantor of marriage licenses for Orange County. Marriage Licenses are valid for 60 days from the date of issuance. The Most Frequent Docs Needing Preparation, Notarization or Apostilles in Hillsborough County: Birth Certificates. The hours for applying for a license are am until pm, Monday through Friday- BUT YOU MUST MAKE AN APPOINTMENT FIRST. Obtaining an Apostille or Notarial Certificate is a twostep process.