A reliable full-name meaning has not been established here. The recorded Irish and English forms are given without an unsupported translation.
Recorded forms
Biorra· Irish · main form · validated name
Birr or Parsonstown· English · main form
Birr· English · main form
Place & story
Birr and Parsonstown
Birr also appears in historical records as Parsonstown, a name associated with the Parsons family. The family seat became an unusual centre of scientific work, where workshops, instruments and visiting researchers formed part of a country-house estate. The National Library's nineteenth-century photograph of Rosse's telescope preserves the older name in its identification of the instrument as the Leviathan of Parsonstown. The names therefore connect the modern town with the language used in contemporary scientific accounts.[2]
People & connections
William Parsons and the great telescope
William Parsons, third Earl of Rosse, developed the great reflecting telescope in the castle grounds during the early 1840s. The estate's account describes a tube seventy-two feet long and a mirror six feet across. From 1845 until 1914 it was the world's largest telescope. Observations with it revealed spiral structures in objects then described as nebulae. The instrument attracted observers and visitors to Birr, while its construction depended on practical work in the castle workshops as well as on the earl's design.[3]
People & connections
Mary Rosse behind the camera
Mary Field moved to Birr Castle after marrying William Parsons in 1836. Offaly Archives records her financial and practical participation in the estate's scientific projects and her interest in early photography. She experimented with processes that required considerable chemical and technical knowledge, and won a silver medal for a paper negative in 1859. Her work gives Birr a history of image-making as well as of astronomical observation.[4]
A surviving working space
Mary's darkroom survives at Birr Castle. The Science Museum's account describes it as one of Europe's oldest and places her photographic experiments in the 1850s. Early photographs included the telescope, family members and visitors. The darkroom and telescope are complementary remains: one concerned the recording of nearby subjects on sensitive surfaces, the other the gathering of faint light from the sky. Together they make Birr's scientific inheritance unusually tangible.[5]
Both counts use the 2016 settlement boundary, allowing like-for-like comparison. CSO supplies the 2022 count on this older boundary for comparison only. The official 2022 Built Up Area has different boundaries.
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Birr — Census 2016 settlement footprint — census population
These are the historical areas published in the 2006 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.
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Birr Legal Town, Offaly — Legal town, CSO 2006 report — census population
Birr Environs, Offaly and North Tipperary — Town environs only, CSO 2006 report
2002–2006: town environs only
990people · 2006
These are the historical areas published in the 2006 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.
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Birr Environs, Offaly and North Tipperary — Town environs only, CSO 2006 report — census population
These are the historical areas published in the 1996 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.
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Birr Legal Town, Offaly — Legal town, CSO 1996 report — census population
Birr Environs, Offaly and North Tipperary — Town environs only, CSO 1996 report
1991–1996: town environs only
838people · 1996
These are the historical areas published in the 1996 census report. Boundaries may differ between censuses and from modern settlements. Legal towns, environs and suburbs are shown separately; none has been combined into a modern settlement total.
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Birr Environs, Offaly and North Tipperary — Town environs only, CSO 1996 report — census population
Figures cover the historical town area printed in the 1986 report. Boundaries may have changed between censuses. Legal town, environs and suburb totals remain separate and differ from modern settlement boundaries.
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Birr, Offaly — Legal town, CSO 1986 report — census population
Birr, Offaly — Town environs only, CSO 1986 report
1981–1986: town environs only
777people · 1986
Figures cover the historical town area printed in the 1986 report. Boundaries may have changed between censuses. Legal town, environs and suburb totals remain separate and differ from modern settlement boundaries.
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Birr, Offaly — Town environs only, CSO 1986 report — census population
These figures use different area definitions. Read the boundary note before comparing them.
Birr, Offaly — 2011 legal town and environs; 2016 census settlement
Published census settlement populations
4,370people · 2016
Settlement boundaries changed during this period. Differences may reflect boundary changes as well as population change. Where a 2011 legal-town-and-environs count is shown, it has not been recalculated onto the 2016 settlement boundary.
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Birr, Offaly — 2011 legal town and environs; 2016 census settlement — census population
Birr Castle, County Offaly illustration: based on a Birr Castle by PAUL FARMER. AI-assisted watercolour and ink adaptation; cream paper margins added, incidental clutter omitted and fine details simplified. Licence: CC BY-SA 2.0.
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