
Hillsboro serves as the focal point of this mid-century survey, surrounded by a transition from organized town grids to expansive Tualatin Valley agricultural lands. The landscape is defined by its transit networks, including the Southern Pacific and Oregon Electric railroads, which linked outlying communities like Orenco and Reedville to the regional hub. Local history is anchored by the Historic Marker (Joseph L Meek Land Claim) and early community sites such as West Union Cem and the Tualatin Plains Cem. North of the Hillsboro Airport, the terrain rises toward the Tualatin Mountains, where smaller settlements like Helvetia and North Plains are connected by roads like West Union Road. This record documents the area just before the significant suburban expansion of the later twentieth century, when the County Fairgrounds and local schools like Union H S were central to civic life.
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1915 · Hillsboro
USGS Topo · 1:62,500
1916 · Tualatin
USGS Topo · 1:62,500
1918 · Hillsboro
USGS Topo · 1:62,500
1939 · Tualatin
USGS Topo · 1:62,500
1940 · Tualatin
USGS Topo · 1:62,500
1940 · Hillsboro
USGS Topo · 1:62,500
1941 · Gales Creek
USGS Topo · 1:62,500
1941 · Yamhill
USGS Topo · 1:62,500
1942 · Yamhill
USGS Topo · 1:62,500
1948 · Vancouver
USGS Topo · 1:250,000