Russ Brabec, Barry Goyette, Jo Rebuck, Walter Castor, Norma Sheehan, George Zinckgraf and Cath Trindle worked on the project adding residence, and adding the years 1901 through 1948. This was no lightweight project, it took a few years. The cutoff date coincided with the beginning of the statewide index of marriages which is available on microfilm and on various genealogical websites.
FamilySearch subsequently scanned some of the Marriage License Applications for San Mateo county. This is not the same record set, but used in conjunction with the index above you might be able to find the record by date. San Mateo County Records on FamilySearch.
Records can be obtained from the San Mateo County Recorder's Office.
Check out the other SMCGS Databases and good luck with your research