| Location
Cortamlet is a townland of 760 statute acres 2 roods and 34 perches about three miles west of Newtownhamilton. It is bounded on the north by Armaghbreague (Keady Parish), on the north-east by Tullyvallen, on the south-east and south by Altnamackan and on the west by Muckno Parish in County Monaghan. In the Tithe Applotment Books of 1825 its total area is shown as 396 acres, 3 roods and 21 perches (Plantation Irish measure) Name of townland Corr Tamhlachta "The round hill of the mass grave" (1). Valuation Although the decimalisation of the currency was introduced only in 1971, all of the valuations in the following table have been converted from £sd for convenience.
The 1837 Townland Valuation recorded only houses worth £5 or more a year. There were four such dwellings in the townland -
Griffiths Valuation records the owner of the land as Walter McGeough Bond Census of Ireland 1901 The Census enumerated 137 people in 30 households; a ratio of 4.6 people per household. The households occupied a total of 146 rooms; a ratio of 4.9 rooms per household and 0.9 people per room. Nine of the households had 6 rooms, three had 5 rooms, fourteen had 4 rooms, three had 3 rooms and one had two room. Three of the houses were thatched. Native Irish Speakers One of the households had four native Irish Speakers. All had been born in County Monaghan. They were -
Population Decline The following table sets out the number of houses and population enumerated in the townland in each of the 11 Censuses held between 1841 and 1951.
In the period of 110 years, the number of households dropped by 63% and the population by 72.6%. Names of House and land Holders (2) The following table sets out the names of those who owned or rented houses and land in the townland at the time the official valuation record or population census was compiled.
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| 1766 | 1830 | 1864 | 1901 | 1935 | 1957 | 1974 |
| Households &c | Households | Households | Households | Households | Households | |
| Allen John | Allen John | Allen John | Adair Samuel | Adair Margaret | Armstrong Joseph | Armstrong Joseph |
| Clark Alexander | Blackwood Saml | Blackwood David | Allen Samuel | Belshaw George | Belshaw William G. | Belshaw William G. |
| Clark Andrew | Clarke Adam | Campbell Robert | Black John | Blackwood David | Bingham William | Blackwood Samuel |
| Clark James | Clarke David | Clarke Alan | Blackwood James | Blackwood Jane | Blackwood Samuel | Clarke Hugh |
| Culbreath John | Clarke Andrew | Clarke Andrew (Draper) | Blackwood Samuel | Clarke (Cooper) Sarah J. | Clarke Andrew | Clarke Susan |
| Donalson Hugh | Clarke Andrew | Clarke Andrew (Whitesland) | Clarke Adam | Clarke Adam | Clarke Hugh | Cranson Charles Howard |
| Duncan John | Clarke James | Clarke David | Clarke Andrew | Clarke Anne Jane | Clarke Samuel | Douglas Herbert |
| Gordon John | Clarke John | Clarke James (Cooper) | Clarke David | Clarke Hugh | Clarke Susan | Draffin Kinnear |
| Graham William | Clarke Wm & James | Clarke James (Elder) | Clarke James | Clarke James | Douglas Herbert | Gordon Aaron |
| Hutcheson John | Coulter Mary | Clarke John | Clarke Margaret | Clarke Samuel J. | Draffin Kinnear | Hadden J.A. |
| Kelly James | Cunningham James | Clarke Samuel (Black) | Clarke Samuel | Heron David | Draffin R. | Hughes Samuel Henry |
| Kelly Robert | Davison Robert | Clarke Samuel (Cooper) | Clarke William | Hughes Michael | Gordon H. | Keating David |
| Latimer Hugh | Dougan Robert | Clarke William (Cooper) | Harvey Mary Ann | Keating David | Hadden J.A. | McGaw James A. |
| McKee John | Garmony Hugh Esqr | Garmoney Reps. William | Littlewood John | Littlewood John | Hadden John A. | McKee James |
| McKee Robert | Harvey Fraser | Gordon James | McClean Thomas | McCullagh John | Heron David | Moorecroft Robert |
| McKee Thomas | Hanaway Frank | Hanway Hugh | McCrea William | McKee James | Honeymans Willaim J. | Preston James |
| McKee William | Hanaway & Rocks | Harvey Thomas | McFadden David | McKee Susan | Hughes Samuel Henry | Preston William |
| Stephenson Andrew | Hilliard Roger | Henry Samuel | McKee Andrew | McKee Thomas | Keating David | Rainey H. |
| Taylor Samuel | Hunter Hugh | Jones William | McKee James | McKee William | McKee James | Redmond James |
| Thomson Richard | Hughes Cornelius | Kearney James | McKee Thomas | Megaw William | Megaw Jane | Russell John |
| Willson Andrew | Irwin Samuel | Littlewood John | McKelvey William | Preston Josias W. | Moorecroft Robert | Warnock William |
| Karney James | Littlewood William | McWhinney Thomas | Proctor Hans | Porter Hans | ||
| Lindon John | Magee Bernard | Mills William | Redmond Agnes | Preston James | Land | |
| Little William | Mawhinney John | Preston Josias | Redmond Ann Eliza | Rainey H. | Burns Samuel | |
| Littlewood William | McCrea James | Redmond Agnus | Redmond James | Redmond James | Clarke James | |
| Magee Owen | McIlwaine Samuel | Redmond Isaac | Redmond Redmond | Redmonds William | Draffin Samuel Kinnear | |
| Mawhinny Robert | McKee James | Redmond James | Redmond William | Russell John | Hadden Cyril | |
| McCrea James | McKee John | Redmond John | Robinson Ethel | Warnock Thomas | McKee (Corkey) Joseph W. | |
| McCaldon Sarah | McKilvey James | Redmond Samuel | Redmond Isaac | |||
| McConnell James | McNamee William | Silvey John | Land | Land | ||
| McElwain Wm | Mills William | Bingham James | Bingham James | |||
| McKee-- | Moore William | Blackwood James | Clarke James | |||
| McKee John | Preston John | Clarke Samuel | Herron David | |||
| McKelvey William | Quay Mary | Clarke Thomas James | McKee (Corkey) Joseph W. | |||
| Mills John | Redmond Jackson | Gordon James | Redmond Isaac | |||
| Moore Charles | Redmond Samuel | Jenkins William | ||||
| Meeting House Green | Redmond Thomas | McGaw William | ||||
| Redmond William | Thompson John | Mills Samuel Jun. | ||||
| Redmond Jackson | Redmond Lily | |||||
| Rooney James | ||||||
| Other | ||||||
| Clarke Sarah (Corn Mill) | ||||||
| Clarke Samuel (Flax Mill) | ||||||