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Map by Malcolm Tunnell The Reddit user Malxredleader put together this excellent map of the oldest building in each US state. Below is a table that outlines all their dates of construction. You can read the full discussion on reddit here. List of Oldest Buildings in Each US State U.S. State/TerritoryBuildingYear BuiltCentury Built AlabamaJoel Eddins House180819th AlaskaKodiak History Museum181019th ArizonaAncestral Puebloan Dwellingsc. 750 CE8th ArkansasWoodruff Print Shop182419th CaliforniaMission San Juan Capistrano177618th ColoradoAncestral Puebloan Dwellingsc. 750 CE8th ConnecticutHenry Whitfield House164017th DelawareRyves Holt House166517th District of ColumbiaOld Stone House176518th FloridaCastillo de San Marcos167217th GeorgiaOcmulgee Earth Lodge101511th HawaiiMalae Heiau120011th IdahoCataldo Mission185319th IllinoisOld Cahokia Courthouse174018th IndianaGrouseland180419th IowaLouis Arriandeaux Log House183319th KansasEl Quartelejo Ruins165017th KentuckyHistoric Locust Grove179018th LouisianaOld Ursuline Convent174818th MaineWilliam Whipple House166017th MarylandOld Trinity Church167517th MassachusettsFairbanks House164117th MichiganOfficer’s Stone Quarters178018th MinnesotaFort Snelling Round Tower182019th MississippiLaPointe-Krebs House175718th MissouriLouis Bolduc House179218th MontanaOld Fort Benton Blockhouse184419th NebraskaLog Cabin183519th NevadaOld Las Vegas Mormon Fort185519th New HampshireStrawbery Banke160017th New JerseyMortonson-Van Leer Log Cabin165417th New MexicoAncestral Puebloan Dwellingsc. 750 CE8th New YorkGardiners Island Shed163917th North CarolinaLane House171818th North DakotaKittson Trading Post184319th OhioRufus Putnam House178818th OklahomaFort Gibson Barracks184019th OregonMolalla Log House179918th PennsylvaniaLower Swedish Cabin165017th Puerto RicoCathedral of San Juan Bautista152116th Rhode IslandWhite Horse Tavern167317th South CarolinaMiddleburg Plantation169417th South DakotaFort Sisseton186419th TennesseeChristopher Taylor House177818th TexasAlamo Mission Long Barracks172418th UtahAncestral Puebloan Dwellingsc. 750 CE8th VermontWilliam Henry House176918th VirginiaJamestown Church164717th WashingtonFort Nisqually Granary184319th West VirginiaRehoboth Church178518th WisconsinTank Cottage177618th WyomingFort Laramie ‘Old Bedlam’ Building184919th