A decade ago there were more than 250 start-ups within a kilometre either side of the River Liffey in Dublin.

https://www.siliconrepublic.com/start-ups/dublin-entrepreneu...

IDA Ireland is the Irish Government’s inward investment promotion agency and has fantastic interactive maps, filterable by sector, showing the clustering around our major cities and CBDs. Dublin a huge outlier in terms of Tech, and Cork in terms of Pharma

https://www.idaireland.com/map