County Offaly population. It is the largest county by area and the third largest by population in the Midlands. Lusmagh Tullamore is the county town and largest town in Offaly and is the 30th largest in Ireland. Offaly borders seven counties: Galway, Roscommon, Tipperary, Laois, Westmeath, Kildare and Meath. The Slieve Bloom Mountains are in the southern part of the county on the border with County Laois. Offaly has the 24th highest county peak in Ireland. The highest point is Arderin () in the Slieve Blooms at . The Slieve Bloom Mountains contain the county's highest points including Stillbrook Hill and Wolftrap
Books of Survey and Distribution include: "Proprietors in 1641 by the Civil Survey", "Denominations of lands by the Downe Survey", "Number of acres distributed", "persons to whom distributed" and "Rent per annum payable to His Majesty". The surviving Survey and Distribution volumes cover the following counties: Kilkenny, Waterford, Kerry, Kildare, Carlow, Wexford, Longford, Mayo, Tipperary, Monaghan, Armagh, Limerick, Westmeath, Clare, Roscommon, Galway, Cork, Down, Antrim, Leitrim, Sligo, Cavan, Fermanagh, Laois, Offaly, Wicklow, Donegal, Londonderry and Tyrone. The Books for Clare, Galway, Mayo and Roscommon have been published by the Irish Manuscripts Commission. For other counties, manuscript copies are available at the National Library.Those for co