The 1926 Irish Census: A Genealogist's Guide
The Centenary Release
A genealogist’s guide to the 1926 Census of Ireland — what was released on 18 April 2026, what it contains, and how to use it well.
For one hundred years, the first census of the Irish Free State sat sealed in 1,299 archival boxes. On 18 April 2026, exactly a century after the enumerators walked the townlands and streets of the newly independent state, the National Archives of Ireland released the entire collection to the public — nearly three million individuals, restored to the documentary record on the same calendar date their forms were filled in.
For Irish genealogists, the centenary release is the largest archival event of a generation. The 1901 and 1911 Irish censuses, released early in the wake of the Public Record Office fire of 1922, have anchored documentary research on Irish ancestors for two decades. The 1926 Census now extends that window forward by fifteen years — into the new state, into the lifetimes of grandparents and great-grandparents still remembered by many living descendants, and into the era when so many Irish-born emigrants had already established new homes abroad. For every family with Irish roots who left someone behind in 1900 or 1910, the 1926 Census is the next time we may see them.
This piece is a practical orientation to the new resource: what it contains, how to search it effectively, the known data limitations and forthcoming improvements, and the citation conventions to use when sharing what you find. It is not a substitute for the National Archives’ own excellent guidance, which I cite throughout — but a genealogist’s perspective on what is actually useful, what to expect, and where the centenary release fits within a broader research strategy.
By the Numbers
The scale of what was released
The 1926 enumeration was the first census taken by the new Irish Free State, established under the Anglo-Irish Treaty in December 1922. The six counties of Northern Ireland fell under separate United Kingdom enumeration and are not part of this release. For ancestors in Donegal, Monaghan, Cavan, and the other twenty-three Free State counties, the 1926 record is the next available census after 1911. The recorded national population — 2,971,992 — represented a decrease of 5.3% from 1911, reflecting fifteen years of war, civil war, emigration, and the influenza pandemic.
The Two Forms
Form A · Form B · what each contains
The 1926 Census is organised around two interlocking documents. Each household completed a Form A — Household Return, listing every individual present in the dwelling on census night. The enumerator then completed a Form B — House and Building Return for each townland or street, summarising the dwellings and the heads of family living in them. Together they provide both the granular and the structural view: who lived where, and how the dwellings of a townland sat next to one another.
The Form A is the heart of the census for genealogists. It carries the names, ages, relationships, birthplaces, occupations, and family-formation information for every individual present in the household on the night of 18 April 1926. It could be completed in either Irish or English — the first census ever to permit Irish-language returns.
- Name and surname
- Relationship to head of household
- Age in years and months
- Sex
- Marriage status or orphanhood
- Birthplace, including townland or town
- Irish language ability
- Religion
- Personal occupation
- Name and business of employer (if any)
- Married women: years of marriage, children born and living
- Married men, widowers, widows: living children under 16
- Total acreage of agricultural holdings
The Form B provides the spatial and structural overview. It records every building in the enumeration area — whether dwelling or institution, inhabited or uninhabited, with the name of each head of family and a tally of persons and rooms occupied. For genealogists, the Form B is where you discover who your ancestor’s neighbours were, and how the rural micro-geography of a townland was structured.
- Type of building (dwelling, institution, etc.)
- Inhabited or uninhabited status
- Number of distinct families in each building
- Name of the head of each family
- Number of males in each family
- Number of females in each family
- Total persons in each family
- Number of rooms occupied by each family
A Genealogist’s First Searches
Strategies adapted from the National Archives’ own guidance
Most users find their ancestors quickly using simple name searches. A small but meaningful number of searches require more care — particularly for surnames with multiple legitimate spellings, Mc and O’ prefixes, Irish-language returns, and individuals living in institutions. The strategies below are the ones I rely on day-to-day when working on Irish lines.
Try wildcards before alternative spellings
The search tool accepts the asterisk wildcard. Mac* returns MacCarthy, MacMahon, and MacAuley; O’R* returns O’Reilly, O’Rourke, and O’Riordan; M*Gee returns McGee, MacGee, and Magee. One wildcard search will usually outperform three separate spelling attempts.
Treat O’, Mc, and Mac as a separate problem
Prefixes were captured exactly as written: O’Riley, ORiley, O Riley and McCormick, MacCormick, Mc Cormick are all genuine variants in the index. Try them as separate searches if the first attempt fails, or use the wildcard pattern to gather them in one pass.
Search for siblings and spouses
When a head of household cannot be found, the same household will usually still appear under a wife, sibling, or adult child. Civil birth registrations at irishgenealogy.ie identify groups of siblings, especially from 1898 onwards when the mother’s maiden name was added to the index.
Try the Irish form of the name
1926 was the first census to permit Irish-language completion. Irish forms appear across the country — not only in Gaeltacht areas. Michael may appear as Micheál, Mary as Máire, John as Seán. The system recognises both fada and non-fada spellings. The Irish Surnames Index on Gaois.ie is a useful reference if you are uncertain.
Search by place when names fail
If the surname does not yield a clean result, switch to the map. Drill in by county, then District Electoral Division (DED), then townland. You can browse every household enumerated at the address — useful for both confirming an ancestor’s presence and discovering the neighbours.
Institutional residents need a different approach
Hospitals, asylums, industrial schools, barracks, and workhouses were enumerated on special institutional forms, indexed under the head of the institution (superintendent, matron, brother, officer) rather than the residents. Locate the institution by place first, then scroll the resident list.
“Expect older or phonetic spellings. Irish and English spellings varied in 1926. Names were written as they sounded.”
Irish-Language Forms
The first census to permit returns in Irish
A meaningful subset of households completed their 1926 returns in Irish. Some were in Gaeltacht regions where Irish was the first language of daily use; others were in towns and cities where households chose Irish as a matter of conviction in the early years of the Free State. Forms in Irish exist in all twenty-six counties — not only in the west — and they are an under-appreciated reservoir of evidence for the cultural alignment of a household in the early Free State years.
All Irish-language forms were manually transcribed by National Archives staff. Names were transcribed as written, preserving older spellings and dialect forms; modern spellings are used where needed for searchability; traditional séimhiú dot marks were transcribed using the letter "h". Names were not translated, since translation could change a name’s meaning. If a search in the English form of a name returns no result, the same person may appear under the Irish form — search Pádraig rather than Patrick, or Siobhán rather than Joan or Johanna, and then scroll the surnames for a match.
The Phased Release
What is searchable now · what is coming · what is missing
The April 2026 release is the first phase of a multi-stage publication strategy. The initial release prioritised the fields people search most often — names, surnames, streets, townlands, and key identifying details. Free-text fields, dashboards, and a small set of known data issues will be addressed in scheduled updates over the year that follows.
Phase One
Names, surnames, streets, townlands, ages, sex, relationship to head, religion, birthplace, marital status, DEDs and counties — all searchable through the public portal. Digital images of all Form A and Form B returns are available free of charge as high-resolution PDFs.
Phase Two
Searchability for occupation and employer fields — written in respondents’ own words and currently being manually transcribed. A dashboard tool for cross-field analysis is also forthcoming, opening larger demographic and social-history queries.
Phase Three Fixes
Approximately 3,000 individuals are missing from the initial transcription, mainly in Dublin, Limerick, Wexford, and Kilkenny — about 0.1% of the total. A larger issue affects ~1,500 individuals in the Merchant’s Quay DED of Dublin, where the original returns appear not to survive. Donegal is under full quality check.
- Donegal county-wide QC underway
- ~3,000 missing entries being manually transcribed
- ~1,500 Merchant’s Quay residents likely unrecoverable
The Map and Dashboards
Geographical search at every scale
Alongside the conventional name-and-place search interface, the 1926 release includes an interactive geographical layer. Search results display on the map as a heat map by county and by District Electoral Division (DED), with the dashboard on the right showing demographic context for each area — including a population pyramid by age and sex and a religion-affiliation chart. Areas with population counts are listed in brackets and sorted highest to lowest, which can quickly point the eye toward the DED or townland most likely to contain your family.
At the highest zoom, the map switches to the Ordnance Survey 1924 base map of Ireland — the cartographic record that was current in 1926 itself. This is one of the genuinely delightful features of the new release: you can compare the geography that the enumerator actually navigated against modern street maps and identify field-level changes in rural townlands across the past century. For ancestors in small townlands, where the names of fields and laneways have shifted but the bones of the landscape remain, this is a research resource in its own right.
Citation and Reuse
Sharing what you find · the CC BY 4.0 framework
The 1926 Census release operates under a generous reuse framework. All images and data are available under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence, by blanket authorisation of the Director of the National Archives. This permits both commercial and non-commercial reuse — including in published case studies, books, blog posts, family histories, and educational materials — provided that appropriate attribution is included and that no technological restriction (paywalls, login walls) is placed on republished material.
Every census form carries a unique archival reference in the format STAT/1/[County code]/[DED]/[Townland]. The reference also appears in the PDF metadata of the downloaded form, so it survives even if the document is shared without its surrounding context.
For published reuse, the National Archives requests the following attribution statement, which I include in every Storyline Genealogy publication that draws on the 1926 Census:
If you modify any census material before sharing — by cropping, annotating, redacting, reformatting into a spreadsheet or chart, or otherwise altering the source — the CC BY 4.0 licence requires you to indicate clearly that changes were made. This standard is the same one applied to most professionally-licensed research material and is straightforward to comply with in practice.
A Worked Example
The methodology applied to a single household
Hugh Hamill of Dian, County Monaghan
On 18 April 2026, the household of Hugh Hamill — farmer, age sixty, of Dian townland — re-entered the documentary record after a century. The companion piece walks through what the Form A return, the Form B house and building return, and the surrounding civil registrations together reveal about a single family on a single farm in south Monaghan in 1926. It is also a worked demonstration of the methodology described above: how to read both forms together, how to integrate the census with civil registration and parish records, and how to apply the citation conventions in practice.
Read the Companion Case Study →What the case study illustrates
- Reading Form A and Form B as a pair
- Reconciling census ages with civil registration
- Identifying a transcription error across sources
- Bridging Irish & emigrant family branches
- Applying STAT/1 citation conventions
The Window Has Opened
For one hundred years the 1926 Census sat in canvas-bound volumes in the archives of the Free State and then the Republic. Until April 2026, the people listed in those volumes could not be researched directly — only inferred from the 1911 record, civil registration, parish entries, and the patient triangulation of surrounding sources. The centenary release does not replace any of that work. It augments it. For most Irish families whose research begins with someone alive in the 1920s, the 1926 Census now provides the first direct documentary anchor; for those of us continuing case studies that have run through 1901 and 1911 returns, it extends the window by fifteen critical years.
The same statutory framework — the Statistics Act 1993 — will release the 1936 Census in April 2036, and 1946 ten years after that. The work that begins now, on the centenary release, builds the foundation for those further releases. The methodology is worth establishing well.
Sources & Further Reading
- National Archives of Ireland. Census of the Irish Free State, 1926. Released to the public 18 April 2026 under the Statistics Act 1993. Available at nationalarchives.ie/search-the-1926-census-2.
- National Archives of Ireland. Finding people in the Census 1926. Search guidance. nationalarchives.ie/finding-people-in-the-census-1926.
- National Archives of Ireland. Phased release of Census 1926 information. Notice describing what is available in the initial release and what is forthcoming in subsequent phases.
- National Archives of Ireland. Permission to reuse Census 1926. Formal notice under the Creative Commons Attribution 4.0 International (CC BY 4.0) licence, by blanket authorisation of the Director of the National Archives.
- Central Statistics Office. Census of Population 1926. Original statistical reports and metadata. The 1926 census data was controlled by the CSO until its transfer to the National Archives.
- Statistics Act 1993 (Republic of Ireland). The statutory basis for the 100-year embargo and subsequent public release of census records.
- Gaois, Fiontar & Scoil na Gaeilge, Dublin City University. Irish Surnames Index. gaois.ie. A useful reference when searching for individuals whose forms were completed in Irish.
- Storyline Genealogy. Hugh Hamill of Dian: The Brother Who Stayed. Companion case study applying the methodology described in this piece to a single County Monaghan household.
Want to Know When New Stories Are Published?
Subscribe to receive updates on new family history research—no spam, just meaningful stories when there's something worth sharing.
SUBSCRIBE TO OUR NEWSLETTEREvery Family Has a Story Worth Telling
Whether you're just beginning your research or ready to transform years of work into a narrative your family will treasure, I'd love to hear your story.
BEGIN YOUR RESEARCH INQUIRY