About Thom's "Thom's Irish Almanac and Official Directory" -to give it the original title- was first published in 1844 by Alexander Thom (left) who had established a thriving printing business in Dublin. His father, Walter Thom, had edited and published the "Dublin Journal" from 1813 until he died in 1824.
Alexander Thom expanded his directory over the next decade and included the Dublin Street Directory for the first time in 1852. Under his personal supervision the Directory grew in prestige and size and became, as it is today, an institution, part of Irish public and private life.
In time Thom's Directory of Dublin was published as a separate Directory although the material also continued to be an integral part of Thom's Directory, Ireland.
In 1960, Thom's Dublin Street Directory and Thom's Commercial Directory were first published as separate directories.
Over the past forty years Thom's Dublin Street Directory has grown with the city listing some 13,066 streets in the 2012 edition.
Thom's Commercial Directory was expanded to include Street Directories for Cork, Galway, Limerick & Athlone and 26 towns in counties Louth, Meath, Kildare & Wicklow together with classified listings for 164 cities & towns.
Thom's Online Directory and Thom's Directory on CD include all business and residential entries from Thom's database.