Texas - Criteria: A (event)
| Old City Mills |
| Old Continental State Bank |
| Old Federal Building and Post Office |
| Old Fort Bliss |
| Old Galveston Customhouse |
| Old Hidalgo Courthouse and Buildings |
| Old Hidalgo School |
| Old Land Office Building |
| Old Lone Star Brewery |
| Old Lyford High School |
| Old Market House Museum |
| Old Masonic Hall |
| Old Morris County Courthouse |
| Old Municipal Assembly Hall |
| Old Nacogdoches University Building |
| Old Penick-Hughes Company |
| Old Post Sanitarium |
| Old Reagan County Courthouse |
| Old Rock Saloon |
| Old Sixth Ward Historic District |
| Old Spanish Trail from US 90 to I-10 |
| Old St. Luke's Episcopal Church |
| Old Taylor County Courthouse and Jail |
| Old Town Historic District |
| Old Town Residential Historic District |
| Old Victoria County Courthouse |
| Old West Austin Historic District |
| Oliphant House |
| Olive Street Historic District |
| Olson-Hanson Farm |
| Olson, Joseph and Anna, Farm |
| Olson-Nelson Farm |
| Onion Creek Crossing at McKinney Falls |
| Onion Creek Post Office and Stagecoach House |
| Orcoquisac Archeological District |
| Oriental Textile Mill |
| Original Town Residential Historic District |
| Our Lady of Victory Academy |
| Our Mother of Mercy Catholic Church and Parsonage |
| Our Mother of Mercy School |
| Paddock Viaduct |
| Paine House |
| Palestine High School |
| Palmito Ranch Battlefield |
| Palo Alto Battlefield National Historic Site |
| Pampa City Hall |
| Panhandle Inn |
| Panna Maria Historic District |
| Panther Junction Mission 66 Historic District |
| Pape-Borchers Homestead |
| Paramount Theatre |
| Paris Commercial Historic District |
| Parker-Browne Company Building |
| Parker Lumber Company Complex |
| Parkland Hospital |
| Park Road 4 Historic District |
| P. A. Smith Hotel |
| Patterson, Stanley, Hall |
| Paul Building |
| Pecan Creek School |
| Pederson, John, Farm |
| People's National Bank Building |
| Perkins Hall of Administration |
| Perry, Capt. William, House |
| Perry Estate-St. Mary's Academy |
| Petroleum Building |
| Pierson, Ole and Ann, Farm |
| Pilot Point Commercial Historic District |
| Pinery Station |
| Pioneer Woman Monument |
| Pittsburg Commercial Historic District |
| Plainview Commercial Historic District |
| Plainview Hardware Company Building |
| Plainview Site |
| Plano Downtown Historic District |
| Plano Station, Texas Electric Railway |
| Planters Bank Building |
| Plaza Theatre |
| Pleasant Hill School |
| Plemons-Mrs. M. D. Oliver-Eakle Additions Historic District |
| Point Bolivar Lighthouse |
| Point Isabel Lighthouse |
| Polk County Courthouse and 1905 Courthouse Annex |
| Pomeroy Homestead |
| Pompeiian Villa |
| Port Arthur Downtown Historic District |
| Port Arthur Federated Women's Clubhouse |
| Porter Farm |
| Post Chapel, Fort Sam Houston |
| Potter County Courthouse and Library |
| Pound, Dr. Joseph M. and Sarah, Farmstead |
| Praetorian Building |
| President's House |
| President's House at Texas College |
| Presidio Chapel of San Elizario |
| Presidio County Courthouse |
| Presidio Nuestra Senora de Loreto de la Bahia |
| Preslar-Hewitt Building |
| Presnall-Watson Homestead |
| Purvin-Hexter Building |
Data from United States Park Service and Wikidata
