The population of the area in 2002 was 440 persons which represented an 8.9% increase in population since 1996. The population increased to 469 by 2011.
Rosenallis is also important in the history of the Quaker movement, with William Edmundson, founder of the Quakers in Ireland, buried outside the village in the Friends graveyard. In 1837 Samuel Lewis described the area writing; "In the Slieve Bloom Mountains are quarries of a soft white sandstone, which hardens when exposed to the air, and is susceptible of a high polish; it is in great demand throughout the country for chimney-pieces and hearth-stones; a coarser kind is used for flagging. Another peculiarity of these mountains is the fertility of their northern side, which is interspersed with neat farm-houses and cultivated enclosures to its summit, while its southern side is mostly a heathy waste. Iron ore was formerly raised, but is not now. There is a large tract of bog in this district, affording an abundant supply of fuel. Tillage is more attended to than grazing: there are but few flocks of sheep. The chief crops are potatoes, wheat, barley and oats."
The village has two churches (Roman Catholic and Church of Ireland) as well as a village primary school, community centre and small shops, the village once had two pubs, closest pubs are Clonaslee and Mountmellick. The secondary level schools serving the area are Clonaslee and Mountmellick.
Rosenallis AFC is the local soccer club. It plays home games at its grounds "Johnsgrove".