Matches in DBpedia 2014 for { ?s ?p 1840. }
- Mixter_Blacksmith_Shop built "1840".
- Morse_Cobblestone_Farmhouse built "1840".
- Moses_Little_Tavern built "1840".
- Mount_Carmel_Congregational_Church_and_Parish_House built "1840".
- Mount_Ida_Plantation built "1840".
- Mystic_Bridge_Historic_District built "1840".
- Nathaniel_Rogers_House built "1840".
- New_Fort_York built "1840".
- Noank_Historic_District built "1840".
- Noel_Owen_Neal_House built "1840".
- Northrup-Gilbert_House built "1840".
- Northwood_Congregational_Church built "1840".
- O'Donnell_House_(Sumter,_South_Carolina) built "1840".
- O._W._Gardner_House built "1840".
- Oakcliff built "1840".
- Oakdale_(Pennsbury_Township,_Pennsylvania) built "1840".
- Office_Building_and_U.S._Light-House_Depot_Complex built "1840".
- Old_Gothic_Barns built "1840".
- Old_Pike_Inn built "1840".
- Old_Town_Residential_Historic_District_(Las_Vegas,_New_Mexico) built "1840".
- Oliver_Chace's_Thread_Mill built "1840".
- Oliver_Warner_Farmstead built "1840".
- Osbornedale built "1840".
- Otsdawa_Baptist_Church built "1840".
- Overton_Lodge built "1840".
- Owego_Central_Historic_District built "1840".
- Pagan-Fletcher_House built "1840".
- Parks-Bentley_House built "1840".
- Parsonage_of_the_Montville_Reformed_Dutch_Church built "1840".
- Patterson_Farmhouse_(Delmar,_New_York) built "1840".
- Paulsdale built "1840".
- Payne_House_(Greensboro,_Alabama) built "1840".
- Peter's_Point_Plantation built "1840".
- Peter_of_P._Grossnickel_Farm built "1840".
- Pico_Pomar_Residence built "1840".
- Pill_Hill_Historic_District built "1840".
- Pitcher-Goff_House built "1840".
- Pleasant_Valley_Methodist_Church built "1840".
- Poplar_Springs built "1840".
- Prospect_Street_Historic_District built "1840".
- Pullen_Corner_School built "1840".
- Randolph_Street_Commercial_Buildings_Historic_District built "1840".
- Ressequie_Farm built "1840".
- Richard_Alsop_IV_House built "1840".
- Rider-Hopkins_Farm_and_Olmsted_Camp built "1840".
- Rienzi_Plantation_House built "1840".
- Robert_Milne_House built "1840".
- Rose_Hill_Cemetery_(Macon,_Georgia) built "1840".
- Samuel_and_Johanna_Jones_Farm built "1840".
- Sedgwick_House_(Bath,_New_York) built "1840".
- Seyfert_Mill built "1840".
- Silas_Dean_House built "1840".
- Silk_Covered_Bridge built "1840".
- Silkman_House built "1840".
- Smith's_Chapel built "1840".
- Smith_Meeting_House built "1840".
- South_Charles_Town_Historic_District built "1840".
- Spring_Valley_Christian_Church_Site built "1840".
- St._Andrew's_Episcopal_Church_and_Cemetery built "1840".
- St._Ann's_Church_Complex_(Bronx) built "1840".
- St._Croix_Boom_Site built "1840".
- St._George's_Catholic_Church built "1840".
- St._Joseph_Plantation built "1840".
- St._Martin_of_Tours_Catholic_Church_(St._Martinville,_Louisiana) built "1840".
- St._Mary's_Roman_Catholic_Church_(Newport,_Maryland) built "1840".
- St._Philip's_Episcopal_Church_(Bradford_Springs,_South_Carolina) built "1840".
- St._Stanislaus_Seminary built "1840".
- St._Vincent_de_Paul_Church_(Baltimore,_Maryland) built "1840".
- Stansfield_Windmill built "1840".
- Staples_Inn built "1840".
- Stately_Oaks built "1840".
- Stewart_Home_School built "1840".
- Stillman_Pratt_House built "1840".
- Summer_Hill_(Davidsonville,_Maryland) built "1840".
- Tackley_Farm built "1840".
- Tally-Ho_Plantation_House built "1840".
- Tenney_Castle_Gatehouse built "1840".
- The_Lindens_(Bryantown,_Maryland) built "1840".
- Thomas_and_Maria_Blackman_Bartlett_House built "1840".
- Three_Mile_Bay_Historic_District built "1840".
- Timothy_Wallace_House built "1840".
- Tousley-Church_House built "1840".
- Uhrshawan_Battery built "1840".
- Union_Church_(Columbia_Falls,_Maine) built "1840".
- Union_Meetinghouse_(Ferrisburg,_Vermont) built "1840".
- Waddell_House_(Lexington,_Missouri) built "1840".
- Waldwic built "1840".
- Walnut_Grove_(Spotsylvania_County,_Virginia) built "1840".
- Walton_Bridge_(Keene,_New_York) built "1840".
- Warrenton_Historic_District_(Warrenton,_North_Carolina) built "1840".
- Washington_Street_Rowhouses built "1840".
- Waverley_(West_Point,_Mississippi) built "1840".
- Webster-Lane_House built "1840".
- Wellington_Front built "1840".
- West_Commerce_Street_Historic_District_(Aberdeen,_Mississippi) built "1840".
- Wester_Ogle built "1840".
- Westerly_Downtown_Historic_District built "1840".
- White_Springs_Historic_District built "1840".
- Whitney_Mansion_(Loudonville,_New_York) built "1840".
- William_B._Dunlap_Mansion built "1840".