What this fee covers
The fee on this page is the statutory charge for issuing the license itself. Texas Local Government Code Section 118.018 says the marriage license fee is for issuing the license and includes every service related to issuance, such as preparing the application, administering oaths, filing waivers or orders, and issuing and recording the paperwork, including the return of the license. That means the fee is tied to the county clerk's issuance process, not to the ceremony or a certified copy of the license after the fact.
Certified copies are typically handled separately by the county clerk, and ceremony fees are set by the officiant or venue rather than by statute. Start your fee estimate with the state-set license amount, then confirm any optional or conditional add-ons with the county clerk before you apply.