In the unlikely event you have a 20th century connection to Portadown, Armagh, Northern Ireland, the 6,043 entries in these directories may be for you.
These transcriptions from Ancestry provide name, residence date, street address and residence place (Portadown, Armagh, Northern Ireland).
Portadown is south of Lough Neath and 37 km southwest of Belfast. Its population grew from 10,000 early in the 20th century to over 16,000 at the end of WW2.
GENUKI has an earlier directory transcription, for 1888, Another source for Armagh, as a whole is provided by John Grenham,