{"nrhp_refnum":"08000400","name":"Monticello Courthouse Square Historic District","other_names":[],"category":"district","location":{"address":"Roughly bounded by Market, RR tracks, N. Hamilton, Independence & Marion Sts.","address_restricted":false,"city":"Monticello","county":"Piatt County","state":"IL","lat":40.02543876650006,"lon":-88.57175171137814,"geom_source":"nps_gis"},"listed_date":"2009-11-05","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Commerce","Politics/Government","Architecture"],"significance_levels":["local"],"summary":{"what_it_is":"A historic commercial district of about sixteen blocks centered on the Piatt County Courthouse Square in Monticello, Illinois. It contains 77 contributing and 8 noncontributing resources, mostly two-story storefronts laid out from the 1841 Original Town plat.","why_significant":"The district keeps the building pattern of a courthouse square framed by dense two-story storefronts, largely intact from the mid-to-late 19th century. It shows the growth of the county seat through Italianate, Romanesque Revival, Classical Revival and later styles. The nomination also stresses its governmental and civic buildings, such as the courthouse and the Town Hall/Opera House/Allerton Library.","narrative":"Monticello's Courthouse Square district covers roughly sixteen blocks of the Piatt County seat in east-central Illinois. Most of it follows the Original Town plat of 1841. The Piatt County Courthouse sits at the center, surrounded by densely built two-story storefronts, with more scattered development to the north and south. Of 85 resources, 77 contribute: 73 buildings, three structures (two 1934 bridges and the 1935 water tower) and one object, a courtyard wall. Italianate is the dominant style, with twenty-five buildings showing its influence. Other styles include Romanesque Revival, as in the Town Hall, Opera House and Allerton Library; Classical Revival; Late Gothic Revival; and Art Moderne. The period of significance runs from about 1856, when the J.C. Johnson/I.O.O.F. Building went up, to 1959, when the Monticello Professional Building was finished. The district's value lies in how fully the courthouse square pattern and its commercial and civic buildings survive from the nineteenth century.","period_of_significance":"c. 1856-1959","architect_builder":"Louis A. Simon, Supervising Architect (U.S. Post Office); R.Z. Gill and Seeley Brown (Town Hall/Opera House/Allerton Library); Jackson, Cook and Dixon (Monticello Professional Building)","architectural_style":"Italianate, Classical Revival, Romanesque Revival","criteria":[],"status_note":"Commercial and governmental uses continue today; the district substantially retains its mid-to-late 19th-century pattern, and eight resources are noncontributing.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:55:37.618305-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/88/8938/28893888/content/electronic-records/rg-079/NPS_IL/08000400.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/08000400/da4c8a912d-800.webp","url_1600":"https://nationalhistoricalregister.com/media/08000400/da4c8a912d-1600.webp","licence":"CC BY 2.5","author":"Dual Freq","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Piatt_County_Illinois_Courthouse.jpg\" rel=\"noopener\">Dual Freq</a>, <a href=\"https://creativecommons.org/licenses/by/2.5\" rel=\"license noopener\">CC BY 2.5</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Piatt_County_Illinois_Courthouse.jpg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/28893888","wikipedia":"https://en.wikipedia.org/wiki/Monticello_Courthouse_Square_Historic_District","wikidata":"https://www.wikidata.org/wiki/Q18217081"},"indexable":true,"url":"https://nationalhistoricalregister.com/illinois/piatt-county/monticello-courthouse-square-historic-district-08000400/"}