Going by people i personally know that go to watch Pollok on an off/on basis, i'd say it's very much a South Side support added to by other fans of Junior/Senior clubs depending on games being called off/away. Thinking of the five people who all live within a 10 minute drive, furthest away is Clarkston. Also going by the five of them, two are recently retired and the other three are in full time employment. They age from 40 to mid 60s.
By South Side, it could be anything South of the River Clyde all the way to Mearns Cross. Same going East/West, could be anywhere from Cambuslang to Crookston. I'd say the bulk of the crowd drive to the ground. It's also one of the wealthiest Junior supports in Central Scotland.