Louisiana - Criteria: C (architecture/engineering)
| Bordelon, Hypolite, House |
| Boscobel Cottage |
| Bosco Plantation House |
| Bossier High School |
| Bouverans Plantation House |
| Boyce Methodist Church |
| Brame-Bennett House |
| Brandt House |
| Breaux House |
| Breston Plantation House |
| Bright-Lamkin-Easterling House |
| Bristow Tower |
| Broadmoor Historic District |
| Brooklyn Church and Cemetery |
| Broussard, Amant, House |
| Broussard House |
| Broussard, Ovide, House |
| Broussard, Valsin, House |
| Brubaker House |
| Brumfield Homestead |
| Bryan House |
| Buckmeadow Plantation House |
| Buena Vista |
| Building at 108 Green Street |
| Bullitt-Longenecker House |
| Burdin House |
| Burks House |
| Burnham, J. W., House |
| Burn, The |
| Burr's Ferry Bridge |
| Butler-Greenwood Plantation |
| Byerley House |
| Bynum House |
| Byram, J.E., House |
| Byrd, C. E., High School |
| Cabildo, The |
| Caddo Lake Bridge |
| Calcasieu Marine Bank |
| Calcasieu Parish Courthouse |
| Caldwell House |
| Calhoun Farmhouse |
| Calkins-Orvis House |
| Calliham Plantation House |
| Calumet Plantation House |
| Campbell Apartment Building |
| Camp Hamilton House |
| Camp Salmen House |
| Capers-McKenzie House |
| Capital City Press Building |
| Carnahan House |
| Carroll House |
| Carrollton Historic District |
| Carter Plantation |
| Carville Historic District |
| Cary, Joshua B., House |
| Cashpoint Plantation House |
| Caspiana House |
| Catahoula Parish Courthouse |
| Catalpa |
| Cate House |
| Cathedral of the Immaculate Conception |
| Cedar Bend Plantation |
| Cedars Plantation |
| Centenary College |
| Central Bank and Trust Co. |
| Central Bank and Trust Company, Mansura |
| Central Fire Station |
| Central Fire Station |
| Central Louisiana State Hospital Dairy Barn |
| Chalmette Unit of Jean Lafitte National Historical Park Historic District |
| Chandeleur Light |
| Chanticleer Gift Shop |
| Charity Hospital of New Orleans |
| Charleston Hotel |
| Chatchie Plantation House |
| Chauviere House |
| Chauvin House |
| Cherie Quarters Cabins |
| Cherokee Plantation |
| Chickama |
| China Grove |
| Chretien Point Plantation |
| Christ Episcopal Church |
| Christ Episcopal Church |
| Christ Episcopal Church and Cemetery |
| Church of St. Anne |
| Church of the Assumption of the Blessed Virgin Mary |
| Church of the Nativity |
| Citizens Bank of Lafourche |
| Claiborne Parish Courthouse |
| Colbert House |
| Colorado Southern Railroad Depot |
| Comeaux House |
| Commercial Building |
| Confederate Memorial Hall |
| Conrad Rice Mill |
| Cook House |
| Cooley, G. B., House |
| Cottage Plantation |
| Cottingham House |
Data from United States Park Service and Wikidata
