Idaho is an unincorporated community in South Bend Township, Armstrong County, Pennsylvania, United States. Early settlers of the community later called Idaho include Absalom Woodward, who built a grist mill and a saw mill on the south side of Plum Creek, near its junction with Crooked Creek, by 1811 when he was first assessed with them. Reu…Idaho is an unincorporated community in South Bend Township, Armstrong County, Pennsylvania, United States. Early settlers of the community later called Idaho include Absalom Woodward, who built a grist mill and a saw mill on the south side of Plum Creek, near its junction with Crooked Creek, by 1811 when he was first assessed with them. Reuben Allshouse, who owned these mills in 1876, gave the surrounding community the name "Idaho" in recognition of that western state as the source of his fortune.
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