Arkansas - Significance region: Local
| Old US 71-Jenny Lind Segment |
| Old US 71-Little River Approach |
| Old US 71-Ogden Segment |
| Old U.S. 71 Ouachita River Bridges |
| Old US 71-Wilton Segement |
| Old US 79, Kingsland Segment |
| Oliver House |
| Olmstead, T. E., & Son Funeral Home |
| O'Neal, Howard, Barn |
| Opal's Steak House |
| Orange Street Presbyterian Church |
| Osceola Times Building |
| Ouachita Avenue Historic District |
| Ouachita County Courthouse |
| Ouachita County Training School |
| Ouachita River Lock and Dam No. 8 |
| Our Lady of Perpetual Help Church |
| Overstreet Hall |
| Owens, Silas, Sr., House |
| Owings House |
| Ozark Courthouse Square Historic District |
| Ozmer House |
| Ozone School |
| Palarm Bayou Pioneer Cemetery |
| Pangburn, Austin, House |
| Paragould Downtown Commercial Historic District |
| Paragould War Memorial |
| Paris Commercial Historic District |
| Parkdale Baptist Church-AS0051 |
| Parkdale Methodist Church |
| Parker-Hickman Farm Historic District |
| Parker House |
| Park Hill |
| Park Hill Fire Station and Water Company Complex |
| Park Hill Historic District |
| Parks School |
| Parkway Courts Historic District |
| Parnell-Sharpe House |
| Parris, Fred W., Towers |
| Paschall House |
| Passmore, Charley, House |
| Passmore House |
| Patman House |
| Patrick, Dr. James. House |
| Patterson, Walter, Filling Station |
| Patterson, Walter, House |
| Patteson House |
| Patton House |
| Peake High School |
| Pea Ridge Commercial Historic District |
| Pea Ridge School Building |
| Peel, Col. Samuel W., House |
| Pence-Carmichael Farm, Barn and Root Cellar |
| Pennington House |
| Peoples Bank and Loan Building |
| Peoples Building & Loan Building |
| "Pernot, Henry ""Harry"" Charles, House" |
| Perry County Courthouse |
| Perry Plaza Court Historic District |
| Perry Rock Island Railroad Depot |
| Perry Street Historic District |
| Perryville American Legion Building |
| Perryville Commercial Historic District |
| Petit Jean River Bridge |
| Petit Jean State Park-Administration Office |
| Petit Jean State Park-Blue Hole Road District |
| Petit Jean State Park-Cabin No. 1 |
| Petit Jean State Park-Cabin No. 16 |
| Petit Jean State Park-Cabin No. 6 |
| Petit Jean State Park-Cabin No. 9 |
| Petit Jean State Park-Cedar Falls Trail Historic District |
| Petit Jean State Park-Concrete Log Bridge |
| Petit Jean State Park-Culvert No. 1 |
| Petit Jean State Park-Lake Bailey-Roosevelt Lake Historic District |
| Petit Jean State Park-Mather Lodge |
| Petit Jean State Park-Office Headquarters |
| Petit Jean State Park-Water Treatment Building |
| Pettigrew School |
| Pfeifer Brothers Department Store |
| Philadelphia Methodist Church |
| Phillips County Courthouse |
| Phillips County Penal Farm Historic District |
| Physical Education Building-Arkansas Tech University |
| Pickens, R.A., II, House |
| Piggott Commercial Historic District |
| Pike, Albert, Hotel |
| Pike County Courthouse |
| Pindall, Xenophon Overton, Law Office |
| Pine Bluff Arsenal Access Road Bridge No. 2280 |
| Pine Bluff Commercial Historic District |
| Pine Bluff Fifth Avenue Historic District |
| Pine Bluff Street Historic District |
| Pine Ridge School Building |
| Pioneer House |
| Planters Bank Building |
| Plaza Apartments |
| Pleasant Hill Methodist Church |
| Pleasant Street Historic District |
| Plumerville School Building |
| Plummer House |
Data from United States Park Service and Wikidata
