Many of these maps are shown as an overlay on a modern OpenStreetMap, to give you a better sense of what they're showing.
An 1847 map of Norwalk, showing parts of the 1860s settlement. This one does not include Roton Hill.
An 1851 Map of the town of Norwalk published by Richard Clark.
An 1858 update of Richard Clark's Map, in this case covering Fairfax County.
An 1867 map of Norwalk published by F. W. Beers.
An 1894 street map from the Norwalk City Directory.
An 1899 business map of Norwalk.
Aerial imagery from 1934, covering all of Connecticut.
A 1941 Sanborn Fire Insurance Map, showing a portion of Roton Hill.