Unionville, Ohio

The same ground, surveyed 87 years apart. Drag the handle to wipe between them. Both sheets are United States Geological Survey originals; neither has been altered.

1907 1994

Matched by testing this settlement's coordinate against the published boundary of every sheet in the United States Geological Survey's historical collection. Each opens the scanned sheet at the Survey.

• 1907 USGS Columbiana quadrangle1:62500
• 1909 USGS Columbiana quadrangle1:62500
• 1909 USGS Columbiana quadrangle1:62500
• 1951 USGS Canton quadrangle1:250000
• 1953 USGS Canton quadrangle1:250000
• 1957 USGS Canton quadrangle1:250000
• 1957 USGS Canton quadrangle1:250000
• 1957 USGS Canton quadrangle1:250000
• 1960 USGS Elkton quadrangle1:24000
• 1960 USGS Elkton quadrangle1:24000
• 1962 USGS Canton quadrangle1:250000
• 1962 USGS Canton quadrangle1:250000
• 1986 USGS East Liverpool quadrangle1:100000
• 1986 USGS East Liverpool quadrangle1:100000
• 1994 USGS Elkton quadrangle1:24000

History of Columbiana County, Ohio, published 1879 names this settlement in its chapter on Fairfield Township. These are the passages that mention it, exactly as the scans read.

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 5 fires within 5 miles of Unionville between 2004 and 2016, burning about 7 acres in total. None started naturally. None was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Settlements close enough to share some of these fires:

• Franklin Square
• Southern Terrace Park
• Columbiana
• Leetonia
• Newhouse (historical)
• Signal

Every fire recorded in Columbiana County

Regional context, not property-specific evidence. Museums hold 550 specimens collected within 10 miles of Unionville between 1884 and 1975: 284 Plantae, 224 Animalia, 41 Fungi, 1 Unrecorded. 12 distinct Species records are shown. Collected by ?, Adler, K. K., Andreas, B.; Cusick, A.W. and others. Each is a physical object with a catalogue number, and each entry opens the museum's record. This is what was collected and kept, not a survey of what lives here - nothing can be concluded from a species being absent.

Image	Species	Year	Collected by	Where, as recorded
	Adiantum pedatum L.	1887	?	Dense woods, Salem.
	Deparia acrostichoides (Sw.) M.Kato	1887	Wilkinson, E.	Salem
	Alternaria Nees	1904	D.F. Yenghing
	Asclepias incarnata L.	1884	E. Wilkinson	Salem
	Cirsium arvense (L.) Scop.	1884	E. Wilkinson	Salem
	Ilex verticillata (L.) A.Gray	1884	Shafer, J.A.	near line of Columbiana Co
	Onoclea sensibilis L.	1884	Shafer, J.A.	near line of Columbiana County
	Thelypteris palustris var. pubescens (G.Lawson) Fernald	1884	Shafer, J.A.	near line of Columbiana Co
	Chamerion angustifolium subsp. circumvagum (Mosquin) Hoch	1885	Shafer, J.A.	N.Y.P.U.O.RR, East of Salem
	Micranthes pensylvanica (L.) Haw.	1885	Shafer, J.A.	near line Columbiana Co
	Platanthera lacera (Michx.) G.Don	1885	Shafer, J.A.; Hill, W.	near Columbiana County line
	Toxicodendron vernix (L.) Kuntze	1885	Shafer, J.A.	near Columbiana County

All 550 specimens within 10 miles, at the Global Biodiversity Information Facility.

Regional context, not property-specific evidence. The federal mineral resources record lists 8 workings within 5 miles of Unionville: 4 producers, 4 past producers. 4 still produce. What was taken out: Sand and Gravel, Construction, Manganese, Chromium. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Every working recorded in Columbiana County

The eight closest, with where each one stands in the county. Distances are straight-line, computed from the Geographic Names Information System coordinates.

Matched on this settlement's Geographic Names Information System number rather than its name, so it cannot be a different place of the same name in another state.

This settlement is recorded in the Geographic Names Information System as feature 1065409. The sheet list is computed by point-in-boundary test against the United States Geological Survey's historical topographic inventory. Both are works of the United States government and carry no copyright under 17 U.S.C. 105.

Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.

Specimens. Global Biodiversity Information Facility (GBIF), https://www.gbif.org/. Only records licensed CC0 or CC BY are used. Records licensed CC BY-NC are excluded because this site carries advertising. Images are checked individually and any whose licence is non-commercial, no-derivatives or unreadable is refused.

Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.