ABSTRACT The Hamilton Perambulatory Unit (HPU) is an artist-research collective that has been holding public walking and mapping events since 2014. Our participatory mapping framework that we call the ‘strata-walk’ focuses attention on the multiplicity of sensory, material, imaginative, socio-political and historical layers that make up place, usually resulting in the creation of maps that document a particular place and time through the contribution of our workshop members. In this short essay, I focus specifically on Strata-Walking Port Hope, the HPU’s community sound-mapping project in Port Hope, Ontario, which was commissioned by Critical Mass: A Centre for Contemporary Art, and produced through conversations with over two dozen Port Hopians of all ages. The outcomes include a mobile locative media sound application that maps the resulting sound collages composed of snippets of conversation, site field recordings and found sounds. Strata-Walking Port Hope provides a glimpse into the memories, stories, histories, and sonic environments of Port Hope.