Maryhill is an unincorporated rural community in the township of Woolwich, Waterloo Region, Ontario, Canada. The population was 576 in 2016. Hopewell Creek flows through the settlement. As European immigrants moved to the area in the early 1800s, the settlement was first called Rotenburg. Between 1827 and 1840, of the 48 settlers who arrived i…Maryhill is an unincorporated rural community in the township of Woolwich, Waterloo Region, Ontario, Canada. The population was 576 in 2016. Hopewell Creek flows through the settlement. As European immigrants moved to the area in the early 1800s, the settlement was first called Rotenburg. Between 1827 and 1840, of the 48 settlers who arrived in Rotenburn, 36 were from Alsace and 12 were from Baden. A particularly large number arrived from Soufflenheim, Alsace, between 1828 and 1860. By 1832, there were 69 families in Rotenburg, and a population of 307.