Religious census returns for certain places were taken in the 18th Century (c. 1740-66). These were some of the first census returns in Ireland and some still survive today. However, the first complete census returns were taken in 1813. This enumeration was followed by others in 1821, 1831, and every ten years thereafter until 1911. Most of these census returns have been destroyed. The 1901 census is the first complete census in existance today.

Census

Religious censuses

(1740-66) vary in their details, but may include the heads of households, parish by parish, and indicate their religion; or may give statistics only. Some returns are available for Dioceses such as Ardagh, Armagh, Clogher, Cloyne, Connor, Cork, Derry, Dromore, Down, Elphin, Ferns, Kildare, Kilmore, Ossory, Raphoe and Ross.

1821 Census gives names of inhabitants, relation to head, ages, occupations, and information about the house and property. Some returns are available for parishes A-M, County Gavan; A-D, County Offaly; A-R, Fermanagh; A-L, Galway; A-T, Meath.

1831 Census gives names of inhabitants, relation to head, ages, occupations, and information about the house and property. Some returns are available for the following parishes in Londonderry County: Agevey, Aghanloo, Arboe, Artrea, Benagher, Glendermot, Killowen, Macosquin, Tamlaght-Finlagen, Templemore, and Termoneeny.

1841 Census gives names of inhabitants, ages, sex, relation to head, marital condition, year of marriage, occupation and birthplace (country, county, or city). The only return available is for Killeshandra Parish, County Cavan.

1851 Census gives the same information as the 1841 plus a list of those people belonging to the family that are not present (including their names, ages, sex, relation to head, present occupation, and country, county, or city of current residence) and a list of those family members who died while residing with the family during the last 10 years (including names, age, sex, relation to head, occupation, season and year of death). Returns are available for Drumkeeran, County Fermanagh and the following parishes in County Antrim: Aghagallon, Aghalee, Ballinderry, Ballymoney, Carncartle, Craigs (Ahoghill), Dunaghy, Grange of Killyglen, Killead, Kilwaughter, Larne, Rasharkin, and Tickmacreevin.

1901 Census gives name of inhabitants, relation to head, religion, age, sex, occupation, marital condition, birthplace (country, county, or city), information on house and property including the name of the lease holder. This census is available in its entirety.

1911 census gives same information as the 1901 plus the number of years married, total number of children born alive, and number of children still living.