Iowa - Significance region: Local
| Beck, James A., House |
| Bedford Commercial Historic District |
| Bedford House |
| Bedford Oil Company Station |
| Beeds Lake State Park, Civilian Conservation Corps Area |
| Beers and St. John Company Coach Inn |
| Beeson, Byron A., House |
| Belfrage, W.L. and Winnie (Woodford), Farmstead Historic District |
| Bell, Alvin Bushnell, House |
| Belle Plaine Main Street Historic District |
| Bellevue Commercial Historic District |
| Bellevue Herald Building |
| Bell, Hill McClelland, House |
| Bell, John, Block |
| Benham, F. A., House |
| Benjamin Chapel and Richwoods Cemetery |
| Bennedsen, Boldt, and Hansen Building |
| Bennett Building |
| Bennington No. 4 |
| Benson Block |
| Benton County Courthouse |
| Benton, Richard, House |
| Beresheim, August, House |
| Berg, Henry, Building |
| Bergman, August H., House |
| Berry, Dr. William E. and Ethel Rosenberger, House |
| Berryhill, Charles, House |
| Best, Louis P. and Clara K., Residence and Auto House |
| Best Oil and Refining Company Service Station |
| Bethany Danish Evangelical Lutheran Church |
| Bethel African Methodist Episcopal Church |
| Bethel AME Church |
| Bethel AME Church |
| Bethel Church |
| Bettendorf-Washington School |
| Bever Woods Historic District |
| Bevington, C. D. and Eliza Heath, Privy |
| Bevington, C. D., House and Stone Barn |
| Bicksler Block |
| Big 4 Fair Art Hall |
| Big Creek Schoolhouse |
| Bigler Building |
| Big Mill Homestead |
| Billingsley-Hills House |
| Binford, Thaddeus, House |
| Birdsall Lime Kiln |
| Bishop's Block |
| Black Hawk County Soldiers Memorial Hall |
| Blackhawk Hotel |
| Black Hawk Hotel |
| Blair House |
| Bloedel, Christian, Wagon Works |
| Bloomfield Public Library |
| Bloomfield Square |
| B'nai Jacob Synagogue |
| Boehmler, H. E., House |
| Boerner-Fry Company/Davis Hotel |
| Bohemian Commercial Historic District |
| Bohemian Commercial Historic District |
| Bohemian Savings Bank |
| Bonaparte Historic Riverfront District |
| Bonaparte Pottery Archeological District |
| Boone County Courthouse |
| Borts, Albert J. and Alice E., House |
| Bostick, William, House |
| Boston Block |
| Boughton, Lemuel C. and Mary (Vaughn), House |
| Bowers and McDonald Office Building |
| Bowery Street Grocery Store |
| Bowman, James W. and Ida G., House |
| Boyd, Byron and Ivan, House |
| Boyle, Hugh and Matilda, House and Cemetery Historic District |
| Boyle, John R., House |
| Boyt Company Building |
| Brammer Grocery Store |
| Braska House |
| Brazelton House |
| Brazelton House Hotel |
| Bregant, Jean and Inez, House |
| Bremer County Court House |
| Bricker-Price Block |
| Brick Gothic House |
| Bridge Avenue Historic District |
| Briggs Terrace |
| Broad View Ranch Historic District |
| Broadway-Phelps Park Historic District |
| Brookhart, Smith Wildman and Jennie (Hearne), House |
| Brooklyn Hotel |
| Brooklyn Opera House–Broadway Theatre |
| Brown Apartments |
| Brown, Corydon, House |
| Brown, James, House |
| Brown Street Historic District |
| Bruce's Snowball Market #1 Addition |
| Brugjeld-Peterson Family Farmstead District |
| Bryan, Alden, House |
| Bryn Mawr Apartments |
| Buchanan County Court House |
| Buchanan School |
| Budde-Singer Building |
Data from United States Park Service and Wikidata
