National Monuments Service (Archaeology.ie)
This excellent website features a monuments database with map links to all registered monuments in the Republic of Ireland. Interactive maps zoom up to aerial photograph level.

Bodleian Library Map Room
The Map Room has an extensive range of books on cartography and GIS. A large selection of atlases are available, together with journals, gazetteers and other reference works.

An Brainse Logainmneacha/Place names Branch
Déanann an Brainse Logainmneacha taighde ar logainmneacha na hÉireann. Soláthraíonn an Brainse foirmeacha oifigiúla Gaeilge de logainmneacha d'eagrais phoiblí nuair a iarrtar iad. Government department responsible for researching Irish place names and providing Irish place name forms to public bodies on request.

British Library map collections
Search or browse the British Library map catalogue.

Bunachar Logainmneacha na hÉireann/Place names database of Ireland
Searchable site run from DCU.

Griffith's Valuation maps
The online database has accompanying OS maps showing individual plots in each townland.

Harvard Map Collection
Search Harvard's print and digital map collections.

Place names NI - The Northern Ireland Place-Name Project
Online database, with searchable maps and index, giving the history of the 9,600 townland names of Northern Ireland.

Ordnance Survey of Ireland Historical Mapping Archive The first edition OS 6-inch maps of all parts of Ireland are now available online. Subscription service. There is also a free map viewer on the OSi site, searchable by county, townland name etc.

Scottish Place-Name Society
The Society, launched in February 1996, exists for the support of all aspects of toponymic studies in Scotland, and in particular the work of the Scottish Place-Name Database at the University of St. Andrews and the University of Edinburgh.

UK National Archives, early Irish maps
Early Irish maps from State Papers c.1558 - c.1610, available online at affordable cost.

Taylor and Skinner's Road Map of Ireland 1778
Colour maps, free website.