You don't say what County that is, there is a "Roanoke Township" in at least a couple of locations that I know of. In U.S. research, it is very important to indicate the County because that is how most searches are done and all records are stored by County and State. Also, I hope you have located them prior to 1940, you need to follow them backwards through their census years to find out where they were living. It is important to find your ancestors and their families in all of the Census tracing them backwards from 1940.
Anyway, once you've determined the name of the County both in 1930 and 1940, do a Search on FamilySearch for the Marriage Record. They have a database with most NC Marriages 1759-1979; at the following link put in one of the parents names, first & last; then click either "Marriage" or "Residence" under the Search Life Event; add in the County and State, then click SEARCH. You'll get a lot of options to check through.https://www.familysearch.org/search/collection/1675514