The UHF assiduously recorded the civil records for Cos. Antrim & Down up 1o 1921.
Also many church records.
See their freely searchable indexes at
http://www.ancestryireland.com/database.php .
[They charge for access to the detail.]
Northern Ireland Marriages 1922-1959, recorded in registers held at Fermanagh House in Belfast, can be found on LDS FHL BRITISH Films:
232168 (Index v. 1-8 1922-1929)
232169 (Index v. 9-16 1930-1937)
232170 (Index v. 17-22 1938-1943)
232171 (Index v. 23-29 1944-1950)
232172 (Index v. 30-35 1951-1956)
232173 (Index v. 36-38 1957-1959)
The details are on LDS FHL BRITISH Films 232174 to 232471.