The following details are included on an Irish Civil Marriage Cert
Registration District, County etc
Name of Church or Registry Office
Date of Marriage
Name & Surname of bride & groom
Ages of bride & groom
Condition of bride & groom
Rank or Profession of bride & groom
Residence of bride and groom at time of Marriage
Fathers names and occupations
Name of priest/minister or Registrar
names of witnesses
(plus 'signature' of bride & groom)
All marriages were registered from 1864. In addition to this Non-Catholic marriages, (i.e. Church of Ireland, Registry Office etc) were registered from 1845.
Age is often entered as 'full', other possible options include an age given in years, or minor if under 21.
Condition is usually one of Bachelor, Spinster, Widow, Widower etc
You can search the Irish Civil BMD index on familysearch at this
linkThe familysearch index holds records for the Republic of Ireland to 1958 and Northern Ireland to the end of 1921.
See these topic for details on ordering certs :
Ordering Certs from GRO Roscommon Ordering N.I.certificates(4/3/2013 updated link)