Ordnance Survey in Northern Ireland & the Republic

OSNI
Ordnance Survey of Northern Ireland covers Northern Ireland
View OSNI mapping on-line

OSI
Ordnance Survey of Ireland covers the Irish Republic
View OSI mapping on-line

Short Histories by Dr. Richard Oliver

• Ireland within the United Kingdom : 1824-1922
• The Free State and the Irish Republic : 1922 to date
• Northern Ireland : 1922 to date

Other Related
See OSI website for more information about Ordnance Survey Ireland
See OSNI website for more information about Ordnance Survey of Northern Ireland (Now part of Land and Property Services)