Troy Grove sits at the heart of this LaSalle County landscape, where the Little Vermilion River carves a winding path through the prairie. The settlement pattern here reflects the grid-based agricultural heritage of North Central Illinois, defined by local thoroughfares such as N 37th Rd and E 5th Rd. Smaller hamlets like Triumph in the northeast and Waltham in the east provide commercial anchors for the surrounding farmsteads.
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1892 · Ottawa
USGS Topo · 1:62,500
1893 · Lasalle
USGS Topo · 1:62,500
1911 · La Salle
USGS Topo · 1:62,500
1913 · La Salle
USGS Topo · 1:62,500
1915 · Ottawa
USGS Topo · 1:62,500
1946 · Ottawa
USGS Topo · 1:62,500
1947 · La Salle
USGS Topo · 1:62,500
1951 · Earlville
USGS Topo · 1:62,500
1952 · Mendota
USGS Topo · 1:62,500
1958 · Aurora
USGS Topo · 1:250,000