| Location
The original townland of Dorsey has a number of divisions eg Dorsey Cavan O'Hanlon, Dorsey Hearty, Dorsey Mullaghglass, Dorsey McDonald and Dorsey McIvor, some now known by other names. The total area of these parts is about 2,500 statute. Dorsey McIvor, now called simply Dorsey, is in the Parish of Creggan. The other divisions are in the parish of Newtownhamilton. Dorsey Mullaglass is a townland of 224 statute acres and 35 perches about three miles north-east of Cullyhanna. It is bounded on the north and east by Carrickrovaddy and Dorsey hearty, on the south by Roxborough on the west by Finiskin and Camly Ball. Name of townland Na Doirse, "The doors or gateways - to Eamhain Macha - Navan Fort". Many of the Dorsey townlands are, as here, completed by the addition of a surname eg. Dorsey McDonald, Dorsey Hearty etc (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 no houses of that valuation in the townland. Griffiths Valuation records the owner of the land as John Douglas. Census of Ireland 1901 The Census enumerated 48 people in 11 households; a ratio of 4.4 people per household. The households occupied a total of 22 rooms; a ratio of 2 rooms per household and 2.2 people per room. One of the households had 4 rooms, one had 3 rooms, six had two rooms and three had one room. Three of the houses were thatched. Native Irish Speakers No Irish speakers were enumerated in the townland. 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 52.9% and the population by 74%. 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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| 1864 | 1901 | 1935 | 1957 | 1974 |
| Households | Households | Households | Households | Households |
| Loy Edward | Loy Anne | Hearty Eugene | Hearty John P. | Hearty John P. |
| Loy Owen | Macken Susan | Loy Edward | Loye Edward | Loye Edward |
| Loy Thomas | Mackin Mary | Mackin John | Mackin (Paddy) John | Mackin (Stephen ) John |
| Macken John | Mackin Patrick | Mackin John | Mackin (Stephen ) John | Mackin Charles |
| Macken Patrick | Mackin Rose | McAvoy Mark | Mackin (Susan) J. | Mackin Mary A. |
| Macken Stephen | McCoy Patrick | McCoy John Patrick | McCoy Patrick | McCoy Patrick |
| Macken Terence | McEvoy Mark | McGivern Francis | McGivern Thomas | McGivern Thomas |
| Macken Thomas | McGivern Francis | Quinn Teresa | Quinn H. | Reel Irene |
| Macmanus Michael | McManus John | Reel Irene | ||
| McKibrican Anne | Quinn Rose | Land | ||
| McKibrican Arthur | Collins Patrick | Land | Land | |
| McManus James | Douglas John | Douglas John | Douglas John | |
| Quin Michael | Harrison James | Hearty Bernard (Dorsey) | Hearty Bernard (Dorsey) | |
| Rooney Thomas | Hearty Michael | Jenkins Samuel | Jenkins William J. | |
| Mackin Steven | Loye Thomas | Loye Thomas | ||
| Land | McEvoy John P. | Mackin John | Mackin John | |
| Douglas John | McGuinness John | Magee T. | Magee T. | |
| McManus Michael | McGuinness John | McGuinness John | ||
| McManus Michael | McManus Michael | |||