As far as I know, there is a microfilm copy of The NYC City Clerk's
Marriage Indexes for the various boroughs >from about 1937 to about 1951 at the
NYC Municipal Archives. That particular set has helped me find a few marriage
records that took place in the 1940s.
Judi Langer-Surnamer Caplan
Long Beach, NY 11561
From: Diane Jacobs <firstname.lastname@example.org>
The NYPL also have groom and bride indexes up into the mid 1950s.
Actually they only have marriages through 1937. After that is at the
Health Department. (I asked to confirm at the Library today.)
The Library has births and deaths but not marriages beyond the Archives.