Colona and Green Rock serve as the primary population centers on this 2012 survey, situated where the Rock River meets the Green River. The landscape transitions from these denser residential grids into a complex network of rural roads and scattered settlements such as Dayton, Briar Bluff, and Morristown. Evidence of the region's agricultural and social fabric is found in several burial grounds, including Colona Cem, Dayton Cem, and Morristown Cem, which offer significant value for genealogists studying Henry County family histories.
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1892 · Leclaire
USGS Topo · 1:62,500
1893 · Leclaire
USGS Topo · 1:62,500
1899 · Clinton
USGS Topo · 1:125,000
1934 · Geneseo
USGS Topo · 1:62,500
1937 · Orion
USGS Topo · 1:62,500
1949 · Coal Valley
USGS Topo · 1:24,000
1949 · Silvis
USGS Topo · 1:24,000
1949 · Port Byron
USGS Topo · 1:24,000
1950 · Port Byron
USGS Topo · 1:24,000
1952 · Erie
USGS Topo · 1:62,500