I am unable to work out when John Holland left Co Armagh b 1825 he would be 20 at the start of the big famine. Familysearch org has aspecial emmigrants from the famine needs to be checked. if he had lived in Co Armagh by 20 he would have known fairly well the neighbours
Focusing on John Holland with likely connection to Co Armagh I found many head of household in the TITHE APPLOTMENT BOOKS 1823-1837 {TAB} based upon the work of the Irish Genealogy Hub’s index listing for each parish in Northern Ireland, which are quicker to lookup if you know the parish! The relevant original books are in the
Public Record Office of Northern Ireland (PRONI) Belfast. The record is known to be biased and incomplete and consists of one inc name, quantity & quality of land, all for tax purposes. Its value is it locates by townland and if any family continued to live there, then about 30 years later ie 1860s they may be traceable to map references showing blg and boundaries of fields etc. in Griffiths valuation. all this helps towards finding which church they may have belonged to and so surviving church records can be searched
John Holland m1 Margaret Macklin
Macklin are found in theses Co Armagh civil parishes with no of entries in brackets
CLONFEACLE (4) DERRYNOOSE(7) GRANGE(1) TYNAN (4)
about 25-30 years later Macklin are still in these parishes in Griffiths Valuation plus KEADY (1)and TYNAN{1}
John Holland m2 Eliza Morton
Holland with Morton living in the same Co Armagh civil parish
ie I have filtered out many entriesHolland, Michl. Townland: Donamoney Y: 1833 Clonfeacle Armagh 1828-33
Morton, William Townland: Drummond Y: 1833—Clonfeacle Armagh 1828-33
Holland, Michl. Townland: Donamoney Y: 1833 Clonfeacle Armagh 1828-33
Morton, William Townland: Drummond Y: 1833—Clonfeacle Armagh 1828-33
Holland Owen Clonalig Creggan Armagh1860's
Morton James Crossmaglen Dundalk Street Creggan Armagh1860's
Holland, James Townland: Tullyhappy Year: 1835 Killevy Armagh1828-33
Morton, William Townland: Drumbanagher Year: 1835-Killevy Armagh1828-33
Morton Thomas Drumbanagher Killevy Armagh1860's
Morton William Drumbanagher Killevy Armagh1860's
Morton Thomas Killybodagh Killevy Armagh1860's
Holland George Serse Killevy Armagh1860's
Holland, William Townland: Ahory Year: 1833 Kilmore Armagh1828-33
Holland, Samuel Townland: Lisavague Year: 1833 Kilmore Armagh 1828-33
Holland, John Townland: Toneyvalton Year: 1833 Kilmore Armagh1828-33
Morton, Mary Townland: Richhill Tenements Year: 1833-Kilmore Armagh 1828-33
there are no Mortons in 1860’s
Morton Mary Jane Armaghbrague Lisnadill Armagh 1860's
Holland John Ballyheridan Lisnadill Armagh 1860's
Holland, George Townland : Turkerry Year : 1828 Loughgall Armagh1828-33
Holland, James Townland : Turkerry Year : 1828 Loughgall Armagh1828-33
Holland, Thomas Townland : Turkerry Year : 1828 Loughgall Armagh1828-33
Morton, Rev. John Townland : Liveleglish Year : 1828 Loughgall Armagh1828-33
Morton Terence Ardress, West. Loughgall Armagh1860's
Holland James Turcarra Loughgall Armagh1860's
Holland Thomas Turcarra Loughgall Armagh 1860's
that reduces a blind search of 28 parishes by about 75% down to 7 or 8 much more likely parishes
sources
1823-1837 Tithes Applotment Books based upon the online index work of the Irish Genealogy Hub’s listing for each parish in Northern Ireland, I have made an index to their entries. The relevant original books are in the Public Record Office of Northern Ireland (PRONI) Belfast
1863 Griffiths Valuation three sources
1.
https://www.failteromhat.com for quick index.
2.
http://www.askaboutireland.ie/griffith-valuation/ for detail and map ref ..
3.
https://www.nidirect.gov.uk/information-and-services/search-archives-online/valuation-revision-books since 1863
one could do the same for Hall and Holland or just the entries for John Holland
last try church record
https://www.irishgenealogy.ie/en/ have run out of time
hope thought provoking Good luck onwards