If Trillick was a market town. How far would it have influence on the surrounding town lands.
Here’s a link to the Topographical Dictionary of Ireland which gives a description of Kilskeery parish in 1837:
https://www.libraryireland.com/topog/K/Kilskerry-Omagh-Tyrone.php
Trillick would have been the main centre for folk who lived in say a 10 mile radius. A lot of the population would not have had regular access to a horse or wheeled transport and so walking was often the main form of travel.