Pigot's directories are trade directories: they covered the whole of the United Kingdom.
John Hayes has photocopied Pigot's directory for Ireland and you can view these at his site, together with a wealth of other data.
A few of the pages have been transcribed (with permission) and are present here.
These transcriptions can be extended: if anyone wishes to cooperate in transcribing them please contact me.
In this list, the page number is the start page for the section as numbered in the original.