Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Oconto City Hall | Building | 178 | Oconto | 44 53 13 N | 087 51 57 W |
| Oconto County Courthouse | Building | 178 | Oconto | 44 53 22 N | 087 51 58 W |
| Oconto County Jail | Building | 178 | Oconto | 44 53 02 N | 087 51 50 W |
| Oconto Falls Community Library | Building | 225 | Oconto | 44 52 34 N | 088 08 42 W |
| Octagon House | Building | 230 | St. Croix | 44 58 51 N | 092 45 20 W |
| Ogg Hall | Building | 262 | Dane | 43 04 16 N | 089 23 53 W |
| Old Main | Building | 194 | Douglas | 46 43 03 N | 092 05 28 W |
| Old Main | Building | 333 | Portage | 44 31 27 N | 089 34 08 W |
| Old Main Hall | Building | 242 | Sheboygan | 43 50 30 N | 087 52 57 W |
| Onalaska City Hall | Building | 213 | La Crosse | 43 53 02 N | 091 13 53 W |
| Onalaska Public Library | Building | 203 | La Crosse | 43 52 33 N | 091 13 48 W |
| Oneida County Courthouse | Building | 476 | Oneida | 45 38 16 N | 089 24 27 W |
| Oregon Public Library | Building | 286 | Dane | 42 55 34 N | 089 22 57 W |
| Oregon Village Hall | Building | 287 | Dane | 42 55 34 N | 089 23 00 W |
| Orienta Townhall | Building | 251 | Bayfield | 46 42 40 N | 091 26 50 W |
| Ormsby Hall | Building | 236 | Outagamie | 44 15 38 N | 088 24 02 W |
| Oshkosh City Hall | Building | 234 | Winnebago | 44 01 16 N | 088 32 31 W |
| Oshkosh Grand Opera House | Building | 231 | Winnebago | 44 01 04 N | 088 32 20 W |
| Oshkosh Public Library | Building | 232 | Winnebago | 44 01 05 N | 088 32 09 W |
| Oshkosh Public Museum | Building | 232 | Winnebago | 44 02 02 N | 088 33 29 W |
| Otter Creek Townhall | Building | 297 | Dunn | 45 06 14 N | 091 51 54 W |
| Oulu Townhall | Building | 323 | Bayfield | 46 37 08 N | 091 31 32 W |
| Our Lady of Lourdes Community Center | Building | 361 | Barron | 45 33 14 N | 091 41 04 W |
| Outagamie County Courthouse | Building | 239 | Outagamie | 44 15 31 N | 088 24 41 W |
| Oviatt House | Building | 234 | Winnebago | 44 01 38 N | 088 33 05 W |
| Ozaukee County Courthouse | Building | 186 | Ozaukee | 43 23 18 N | 087 52 16 W |
| Ozaukee County Jail | Building | 186 | Ozaukee | 43 23 18 N | 087 52 19 W |
| Pabst Theater | Building | 181 | Milwaukee | 43 02 28 N | 087 54 36 W |
| Paine Art Center and Arboretum | Building | 232 | Winnebago | 44 02 05 N | 088 33 27 W |
| Park Falls City Hall | Building | 464 | Price | 45 55 55 N | 090 27 10 W |
| Park Falls Public Library | Building | 460 | Price | 45 56 08 N | 090 27 08 W |
| Park Manor Nursing Home | Building | 453 | Price | 45 56 02 N | 090 26 39 W |
| Parker Hall | Building | 275 | Pierce | 44 51 09 N | 092 36 55 W |
| Parker Memorial Field House | Building | 334 | Portage | 44 31 26 N | 089 33 41 W |
| Parkside Union | Building | 206 | Kenosha | 42 38 51 N | 087 51 19 W |
| Patrick and Beatrice Haggerty Library | Building | 217 | Milwaukee | 43 04 18 N | 088 01 54 W |
| Patton Building | Building | 181 | Milwaukee | 43 02 21 N | 087 55 02 W |
| Paul Revere Community Center | Building | 368 | Barron | 45 23 38 N | 091 55 52 W |
| Pearse Hall | Building | 209 | Milwaukee | 43 04 37 N | 087 52 42 W |
| Pearson Hall | Building | 239 | Rock | 42 30 13 N | 089 01 54 W |
| Peck Townhall | Building | 460 | Langlade | 45 14 02 N | 089 14 09 W |
| Peshtigo City Hall | Building | 186 | Marinette | 45 03 15 N | 087 45 07 W |
| Peshtigo Fire Museum | Building | 186 | Marinette | 45 03 21 N | 087 45 12 W |
| Peshtigo Townhall | Building | 186 | Marinette | 45 03 02 N | 087 39 25 W |
| Peterson Office Building | Building | 264 | Dane | 43 04 26 N | 089 23 54 W |
| Pettibone World Affairs Center | Building | 239 | Rock | 42 30 09 N | 089 01 48 W |
| Phoenix Sports Center | Building | 205 | Brown | 44 31 48 N | 087 54 58 W |
| Piehl Townhall | Building | 507 | Oneida | 45 39 42 N | 089 08 24 W |
| Pierce County Courthouse | Building | 373 | Pierce | 44 43 58 N | 092 29 08 W |
| Pine Hills Clubhouse | Building | 192 | Sheboygan | 43 45 60 N | 087 46 17 W |
| Pine River Power Plant | Building | 344 | Florence | 45 49 37 N | 088 14 54 W |
| Pine Valley Manor County Home | Building | 224 | Richland | 43 18 13 N | 090 21 06 W |
| Pioneer Building | Building | 185 | Milwaukee | 43 02 17 N | 087 54 25 W |
| Plankinton Building | Building | 180 | Milwaukee | 43 02 19 N | 087 54 43 W |
| Platteville City Hall | Building | 302 | Grant | 42 44 05 N | 090 28 42 W |
| Pleasant Valley Townhall | Building | 321 | St. Croix | 44 54 21 N | 092 28 15 W |
| Plymouth City Hall | Building | 257 | Sheboygan | 43 44 54 N | 087 58 44 W |
| Plymouth Public Library | Building | 256 | Sheboygan | 43 44 54 N | 087 58 35 W |
| Polar Townhall | Building | 480 | Langlade | 45 09 40 N | 089 01 07 W |
| Polish National Alliance Home | Building | 194 | Milwaukee | 43 00 36 N | 087 55 18 W |
| Polk County Courthouse | Building | 359 | Polk | 45 27 16 N | 092 28 04 W |
| Polk County Home | Building | 334 | Polk | 45 22 10 N | 092 24 13 W |
| Pool Hall | Building | 234 | Winnebago | 44 01 32 N | 088 32 59 W |
| Poplar Grove Community Center | Building | 251 | Manitowoc | 44 05 55 N | 087 59 27 W |
| Popple River Townhall | Building | 472 | Forest | 45 47 39 N | 088 41 45 W |
| Portage County Courthouse | Building | 332 | Portage | 44 31 15 N | 089 34 50 W |
| Portage Municipal Building | Building | 248 | Columbia | 43 32 28 N | 089 27 43 W |
| Powell Place | Building | 200 | La Crosse | 43 48 47 N | 091 15 13 W |
| Prairie du Chien City Hall | Building | 194 | Crawford | 43 03 07 N | 091 08 53 W |
| Prairie Lake Townhall | Building | 338 | Barron | 45 19 18 N | 091 43 33 W |
| Pray Hall | Building | 333 | Portage | 44 31 48 N | 089 34 07 W |
| Price County Courthouse | Building | 453 | Price | 45 41 25 N | 090 23 56 W |
| Prucha Hall | Building | 276 | Pierce | 44 51 13 N | 092 37 38 W |
| Pulaski Building | Building | 208 | Milwaukee | 43 04 15 N | 087 54 03 W |
| Pulaski Hall | Building | 195 | Milwaukee | 43 00 17 N | 087 55 57 W |
| Putnam Hall | Building | 236 | Eau Claire | 44 47 55 N | 091 30 13 W |
| Quandt Fieldhouse | Building | 332 | Portage | 44 31 46 N | 089 34 20 W |
| Racine County Courthouse | Building | 190 | Racine | 42 43 31 N | 087 47 03 W |
| Racine Public Library | Building | 189 | Racine | 42 43 33 N | 087 46 56 W |
| Radford Hall | Building | 233 | Winnebago | 44 01 33 N | 088 33 05 W |
| Rahr Civic Center Museum | Building | 196 | Manitowoc | 44 05 57 N | 087 39 23 W |
| Randall Tower | Building | 266 | Dane | 43 04 20 N | 089 24 31 W |
| Randolph Village Hall | Building | 292 | Columbia | 43 32 17 N | 089 00 31 W |
| Rankin Hall of Science | Building | 262 | Waukesha | 43 00 12 N | 088 13 42 W |
| Raymond Town Hall | Building | 231 | Racine | 42 47 58 N | 088 00 47 W |
| Red Cedar Community Center | Building | 347 | Barron | 45 30 13 N | 091 44 07 W |
| Red Springs Town Hall | Building | 295 | Shawano | 44 53 07 N | 088 45 43 W |
| Reedsburg Municipal Building | Building | 273 | Sauk | 43 31 54 N | 090 00 19 W |
| Reedsburg Public Library | Building | 273 | Sauk | 43 31 54 N | 090 00 21 W |
| Reeve Memorial Union | Building | 234 | Winnebago | 44 01 30 N | 088 32 57 W |
| Regina Hall | Building | 232 | Fond du Lac | 43 46 42 N | 088 25 12 W |
| Reuter Hall | Building | 205 | La Crosse | 43 49 05 N | 091 13 38 W |
| Rhinelander City Hall | Building | 473 | Oneida | 45 38 10 N | 089 24 39 W |
| Rhinelander District Library | Building | 475 | Oneida | 45 38 21 N | 089 24 39 W |
| Rice Lake City Hall | Building | 345 | Barron | 45 30 17 N | 091 43 58 W |
| Rice Lake Fire Department | Building | 346 | Barron | 45 30 05 N | 091 44 12 W |
| Rice Lake Jail | Building | 345 | Barron | 45 30 03 N | 091 44 12 W |
| Rice Lake Police Department | Building | 345 | Barron | 45 30 03 N | 091 44 11 W |
| Rice Lake Public Library | Building | 346 | Barron | 45 30 15 N | 091 43 59 W |
| Rice Lake Town Hall | Building | 344 | Barron | 45 28 52 N | 091 44 09 W |
| Richard E Hibbard Humanities Hall | Building | 236 | Eau Claire | 44 47 52 N | 091 29 55 W |
| Richard Guenther House | Building | 229 | Winnebago | 44 01 05 N | 088 31 11 W |
| Richland Community Building | Building | 220 | Richland | 43 20 07 N | 090 23 31 W |
| Richland County Courthouse | Building | 223 | Richland | 43 20 03 N | 090 23 09 W |
| Rigler Hall | Building | 344 | Barron | 45 28 55 N | 091 44 48 W |
| Ripon City Hall | Building | 279 | Fond du Lac | 43 50 47 N | 088 50 19 W |
| Ripon Public Library | Building | 275 | Fond du Lac | 43 50 50 N | 088 50 21 W |
| Ritzinger Hall | Building | 344 | Barron | 45 28 58 N | 091 44 48 W |
| River Falls City Hall | Building | 275 | Pierce | 44 51 31 N | 092 37 30 W |
| River Falls Public Library | Building | 275 | Pierce | 44 51 31 N | 092 37 30 W |