Glen Williams is a hamlet in Halton Hills, Halton Regional Municipality, Ontario, Canada. It has a population of about 2700 people and its closest neighbours are Georgetown and Terra Cotta. Glen Williams is noted for its visual artists, artist's studios, heritage buildings, a restaurant and bakery, a community centre, parks, churches and homes. The Credit River flo…Glen Williams is a hamlet in Halton Hills, Halton Regional Municipality, Ontario, Canada. It has a population of about 2700 people and its closest neighbours are Georgetown and Terra Cotta. Glen Williams is noted for its visual artists, artist's studios, heritage buildings, a restaurant and bakery, a community centre, parks, churches and homes. The Credit River flow through the hamlet, providing a habitat for animals.