Stone axes, arrow heads and blades were discovered which date to between 6,800 – 6,000 BCE.
A bronze bucket was also found, it was constructed of sheets of bronze riveted together, this item is considered to be an imported item, two other buckets were also found and these are presumed to be native copies.
After Christianisation, the monastic complex of Clonmacnoise was erected at the River Shannon near Shannonbridge. The county itself was formed following the Tudor plantations of Laois and Offaly in an attempt by the English Crown to expand its sphere of influence in Ireland which had declined following the Norman Conquest of Ireland.
The Kingdom of Uí Failghe from which the name Offaly is derived, was ruled by the Ó Conchobhair Failghe (anglicised as: O'Conor Faly) whose territory extended from the east of the county into north Kildare.
The Kingdom of Firceall ruled by the O'Molloy clan constituted much of the centre of the county.
The county contains many small lakes from Lake Boora to Pallas Lake and it also contains 42 hectares of swamp.
There are a number Eskers in the counties landscape including Esker Riada.
The population of the county is 78,003 according to the 2016 census.
Tullamore is the county town and largest town in Offaly and is the 30th largest in Ireland.
Although only 234 metres high, it is known for its view over the surrounding area and it stands out by itself.