Kilgarvan's population is calculated using DED District Electoral Division and for statistical purposes consists of three districts as you can see here and here called Kilgarvan, Glanlough and Glanlee when you add the three together you get the total figure of 1,046. 

The increase in house prices led to many more being built on a speculative basis as a result of the bubble these new houses were then rented out and sold and this brought new people into the area and encouraged natives to stay rather move elsewhere.