The Big Sioux River carves a winding path through this region, serving as the natural boundary between Iowa and South Dakota. This intersection of state lines and county borders includes portions of Woodbury and Union Counties, with Plymouth County situated just to the north. The urban footprint of Sioux City is well-defined, showing the residential and institutional layout as it stood in the mid-2010s. Notable educational landmarks like Briar Cliff Univ and Saint Luke's Coll anchor the city's northern neighborhoods.
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1898 · Elk Point
USGS Topo · 1:125,000
1901 · Elk Point
USGS Topo · 1:125,000
1907 · Elk Point
USGS Topo · 1:125,000
1955 · Sioux City
USGS Topo · 1:250,000
1958 · Sioux City
USGS Topo · 1:250,000
1959 · Sioux City
USGS Topo · 1:250,000
1963 · Sioux City South
USGS Topo · 1:24,000
1963 · Sioux City North
USGS Topo · 1:24,000
1963 · Elk Point NE
USGS Topo · 1:24,000
1963 · Jefferson
USGS Topo · 1:24,000