{"nrhp_refnum":"79002194","name":"Unionville Historic District","other_names":[],"category":"district","location":{"address":"U.S. 220 and PA 504","address_restricted":false,"city":"Unionville","county":"Centre County","state":"PA","lat":40.90420899900005,"lon":-77.87451122163972,"geom_source":"nps_gis"},"listed_date":"1979-05-30","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Transportation","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A historic village district in Unionville, Centre County, Pennsylvania, containing roughly 105 principal structures, 83 outbuildings, and a concentration of pre-World War I houses along Union Street, Main Street, Allegheny Street and nearby streets in Bald Eagle Valley.","why_significant":"The nomination argues the district is significant as a record of 19th-century settlement and for its high concentration of vernacular and folk house types, especially the plank house, a rare construction method in which two layers of two-inch planks form solid walls. It also cites the village's role as a transportation node on the Plank Road and the Rattlesnake Pike, its lumbering and milling economy, and the influence of William Underwood, a Quaker and the village's founder.","narrative":"Unionville is a village district in Bald Eagle Valley, Centre County, with about 105 principal structures, most built before World War I and laid out on 60-foot lots along the streets. Its oldest houses are plank I-houses, four bays wide and two stories high, built of two layers of two-inch planks that provide solid walls. The L. C. Peters House, dating to about 1844, is regarded as probably the oldest house in the district. Settlement grew after the Plank Road opened in 1850, when the village became a transportation node and a centre of lumbering, milling and tanning. Later buildings show Greek Revival, Italianate and Gothic Revival details in houses, churches and stores. The district's significance lies chiefly in the concentration of vernacular and folk house types, which together record 19th-century small-town life. William Underwood, a Quaker, was the most important figure in its founding.","period_of_significance":"1848-1900","architect_builder":null,"architectural_style":"Vernacular Georgian I-house, Greek Revival, Italianate, Gothic Revival, Victorian","criteria":["A","C"],"status_note":"Most buildings retain their historic character; 21 structures are described as intrusive, including 15 mobile homes, and three sites once held historic structures.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:30.472647-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/79002194.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/79002194/6374217b2e-800.webp","url_1600":"https://nationalhistoricalregister.com/media/79002194/6374217b2e-1600.webp","licence":"CC BY-SA 4.0","author":"Ruhrfisch (talk)","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Unionville,_Centre_County,_Pennsylvania.jpg\" rel=\"noopener\">Ruhrfisch (talk)</a>, <a href=\"https://creativecommons.org/licenses/by-sa/4.0\" rel=\"license noopener\">CC BY-SA 4.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Unionville,_Centre_County,_Pennsylvania.jpg"},"district":{"nrhp_refnum":"81000538","name":"Farmers' High School","url":"https://nationalhistoricalregister.com/districts/pennsylvania/farmers-high-school-81000538/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71998420","wikipedia":"https://en.wikipedia.org/wiki/Unionville_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q7886888"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/centre-county/unionville-historic-district-79002194/"}