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1900s–2026 · SR 23 and SR 4; USGS quadrangles; aerials and GIS
The travelers' map class runs on the two state roads that cross at the town: SR 23, which is Main Street through the historic district, and SR 4, which serves the town and the state park entrance at 25601 State Road 4. State highway maps of the automobile age draw North Liberty at the size of that crossing — a named dot at a junction — and the town's 2015 comprehensive plan is the modern booster-planning map set for the same ground, printing the historic district between Center and Harrison on SR 23. The national topographic record covers the township in the USGS 7.5-minute quadrangle series; the specific quadrangle names and edition dates for the town sheet were not verified — a named gap with a plain settler: the USGS topoView index for the North Liberty quadrangle. The photographic map begins with the federal aerial survey flights that covered St. Joseph County farmland from the late 1930s and continues to the present imagery; the living map, as of November 2026, is St. Joseph County's public GIS and parcel viewer, in which the Antrim plat's lots and their additions survive as the parcel fabric of the town — the 1836-or-1837 drawing, still legally load-bearing, under every modern layer. The historic sheets themselves live, in public custody, at the Library of Congress (Sanborn images, online), the Indiana State Library (Sanborn and atlas holdings) and the county's own offices.