Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Our Lady of Hope Church | Church | 65 | Hampden | 42 07 17 N | 072 35 20 W |
| Our Lady of Hope School | School | 58 | Hampden | 42 07 19 N | 072 35 16 W |
| Our Lady of LaSalette Seminary | School | 38 | Essex | 42 39 49 N | 070 53 08 W |
| Our Lady of Lourdes Church | Church | 30 | Plymouth | 41 53 58 N | 070 45 51 W |
| Our Lady of Lourdes School | School | 7 | Bristol | 41 53 20 N | 071 05 41 W |
| Our Lady of Mercy Church | Church | 42 | Middlesex | 42 22 40 N | 071 10 08 W |
| Our Lady of Mercy School | School | 215 | Worcester | 42 18 00 N | 071 49 28 W |
| Our Lady of Mount Carmel Church | Church | 147 | Worcester | 42 15 49 N | 071 47 35 W |
| Our Lady of Mount Carmel School | School | 20 | Hampden | 42 05 50 N | 072 35 01 W |
| Our Lady of Perpetual Help Church | Church | 160 | Worcester | 42 15 23 N | 071 46 16 W |
| Our Lady of Perpetual Help School | School | 55 | Hampden | 42 12 00 N | 072 37 01 W |
| Our Lady of the Angles School | School | 158 | Worcester | 42 14 38 N | 071 50 29 W |
| Our Lady of the Assumption School | School | 44 | Essex | 42 30 57 N | 071 00 23 W |
| Our Lady of the Hills Church | Church | 431 | Berkshire | 42 11 40 N | 073 13 05 W |
| Our Lady of the Holy Rosary School | School | 327 | Worcester | 42 34 26 N | 071 59 56 W |
| Our Lady of the Incarnation Church | Church | 193 | Berkshire | 42 42 09 N | 073 09 35 W |
| Our Lady of the Lake Church | Church | 276 | Worcester | 42 35 18 N | 071 49 53 W |
| Our Lady of the Presentation Academy | School | 33 | Suffolk | 42 21 10 N | 071 10 28 W |
| Our Lady of the Rosary Church | Church | 193 | Worcester | 42 18 40 N | 071 47 41 W |
| Our Lady of the Sacred Heart Church | Church | 64 | Hampden | 42 07 46 N | 072 31 39 W |
| Our Lady of the Valley School | School | 79 | Worcester | 42 04 39 N | 071 37 29 W |
| Our Lady of Victories Church | Church | 4 | Suffolk | 42 20 56 N | 071 04 13 W |
| Our Lady School | School | 16 | Middlesex | 42 21 18 N | 071 11 53 W |
| Our Lady Star of the Sea Roman Catholic Church | Church | 3 | Dukes | 41 27 12 N | 070 33 31 W |
| Our Ladys School | School | 70 | Middlesex | 42 24 32 N | 071 13 46 W |
| Our Saviours Lutheran Church | Church | 326 | Worcester | 42 32 30 N | 071 54 55 W |
| Outdoor World Campground | Locale | 221 | Worcester | 42 03 54 N | 072 05 43 W |
| Outer Badger Rocks (historical) | Bar | -4 | Essex | 42 49 08 N | 070 49 16 W |
| Outer Breakers | Bar | 4 | Essex | 42 27 45 N | 070 50 18 W |
| Outer Brewster Island | Island | 16 | Suffolk | 42 20 30 N | 070 52 38 W |
| Outer Gut | Gut | 3 | Essex | 42 27 25 N | 070 53 45 W |
| Outer Minot | Bar | 9 | Plymouth | 42 16 10 N | 070 45 32 W |
| Outer Point Rock | Island | 5 | Essex | 42 31 10 N | 070 50 23 W |
| Outer Seal Rock | Island | 5 | Plymouth | 42 17 48 N | 070 54 28 W |
| Outer Tautog Rock | Island | 0 | Plymouth | 41 57 16 N | 070 34 56 W |
| Outlook Park | Park | 73 | Norfolk | 42 20 34 N | 071 08 00 W |
| Overbrook | Populated Place | 38 | Norfolk | 42 18 18 N | 071 19 28 W |
| Overholt Building | Building | 8 | Suffolk | 42 20 21 N | 071 06 22 W |
| Overlook Reservoir | Reservoir | 262 | Worcester | 42 35 54 N | 071 48 58 W |
| Overlook Reservoir Dam | Dam | 251 | Worcester | 42 35 36 N | 071 48 58 W |
| Overlook Reservoir Dam | Dam | 255 | Worcester | 42 35 54 N | 071 48 58 W |
| Overlook Reservoir Dike | Dam | 255 | Worcester | 42 35 54 N | 071 48 58 W |
| Overlook Trail | Trail | 934 | Berkshire | 42 38 20 N | 073 10 27 W |
| Overthrough Hill | Summit | 97 | Middlesex | 42 20 09 N | 071 21 28 W |
| Owen District | Populated Place | 135 | Hampden | 42 09 33 N | 072 41 24 W |
| Owen Park | Park | -1 | Dukes | 41 27 29 N | 070 36 04 W |
| Owen Park Beach | Beach | -7 | Dukes | 41 27 33 N | 070 36 00 W |
| Owl Hill | Summit | 73 | Middlesex | 42 23 24 N | 071 12 11 W |
| Owl Pond | Lake | 7 | Barnstable | 41 46 13 N | 070 00 58 W |
| Owl Swamp | Swamp | 23 | Plymouth | 41 51 00 N | 070 54 08 W |
| Ox Hill | Summit | 296 | Franklin | 42 29 23 N | 072 31 50 W |
| Ox Pasture Brook | Stream | | Essex | 42 44 40 N | 070 53 28 W |
| Ox Pasture Hill | Summit | 64 | Essex | 42 44 15 N | 070 52 53 W |
| Ox Pond | Lake | 40 | Barnstable | 41 43 13 N | 070 30 06 W |
| Oxbow Brook | Stream | | Franklin | 42 37 17 N | 072 46 48 W |
| Oxbow Corporation Heliport | Airport | 89 | Norfolk | 42 13 05 N | 071 17 48 W |
| Oxbow National Wildlife Refuge | Park | 67 | Middlesex | 42 30 40 N | 071 37 18 W |
| Oxbow National Wildlife Refuge | Park | 86 | Worcester | 42 29 50 N | 071 37 23 W |
| Oxford | Populated Place | 15 | Bristol | 41 39 20 N | 070 54 23 W |
| Oxford | Populated Place | 156 | Worcester | 42 07 00 N | 071 51 53 W |
| Oxford Airport | Airport | 233 | Worcester | 42 09 07 N | 071 50 04 W |
| Oxford Airport Incorporated | Airport | 195 | Worcester | 42 08 30 N | 071 54 26 W |
| Oxford Building | Building | 11 | Middlesex | 42 22 56 N | 071 06 56 W |
| Oxford Country Club | Locale | 34 | Hampden | 42 09 30 N | 072 33 43 W |
| Oxford Free Library | Building | 154 | Worcester | 42 07 06 N | 071 51 54 W |
| Oxford Heights | Populated Place | 191 | Worcester | 42 10 25 N | 071 52 43 W |
| Oxford High School | School | 161 | Worcester | 42 08 15 N | 071 52 04 W |
| Oxford Middle School | School | 156 | Worcester | 42 07 20 N | 071 51 58 W |
| Oxford Post Office | Post Office | 153 | Worcester | 42 06 55 N | 071 51 52 W |
| Oxford Sanitary Land Fill | Locale | 232 | Worcester | 42 08 46 N | 071 50 03 W |
| Oxford School | School | 19 | Bristol | 41 39 10 N | 070 54 28 W |
| Oxford Street School | School | 159 | Worcester | 42 15 50 N | 071 48 23 W |
| Oxford Town Hall | Building | 155 | Worcester | 42 07 03 N | 071 51 54 W |
| Oxford United Methodist Church | Church | 155 | Worcester | 42 07 08 N | 071 51 50 W |
| Oxford-Crown Historic District | Park | 161 | Worcester | 42 15 41 N | 071 48 24 W |
| Oyster Harbors | Populated Place | 7 | Barnstable | 41 37 15 N | 070 24 55 W |
| Oyster Harbors Beach | Beach | -2 | Barnstable | 41 36 20 N | 070 24 58 W |
| Oyster Pond | Lake | 2 | Barnstable | 41 40 45 N | 069 58 28 W |
| Oyster Pond | Lake | -3 | Barnstable | 41 32 30 N | 070 38 20 W |
| Oyster Pond | Lake | -3 | Dukes | 41 21 30 N | 070 35 53 W |
| Oyster Pond Beach | Beach | -4 | Barnstable | 41 40 48 N | 069 57 50 W |
| Oyster Pond River | Stream | | Barnstable | 41 39 50 N | 069 58 46 W |
| Oyster Pond River Marshes | Swamp | 8 | Barnstable | 41 40 39 N | 069 58 56 W |
| P Collins Statue | Park | 16 | Middlesex | 42 21 08 N | 071 04 38 W |
| Pace School | School | 19 | Hampden | 42 08 22 N | 072 37 23 W |
| Pacelle Industrial Park | Locale | 52 | Norfolk | 42 12 07 N | 071 03 03 W |
| Packard Brook | Stream | | Franklin | 42 36 17 N | 072 25 48 W |
| Packard Dam | Dam | 78 | Middlesex | 42 19 30 N | 071 27 58 W |
| Packard Hall | Building | 50 | Middlesex | 42 24 28 N | 071 07 12 W |
| Packard Heights | Populated Place | 184 | Franklin | 42 38 00 N | 072 13 45 W |
| Packard Hill | Summit | 414 | Worcester | 42 39 03 N | 071 56 03 W |
| Packard Mountain | Summit | 386 | Franklin | 42 27 40 N | 072 21 10 W |
| Packard Pond | Lake | 116 | Worcester | 42 01 45 N | 071 53 31 W |
| Packard Pond | Reservoir | 187 | Franklin | 42 38 00 N | 072 14 10 W |
| Packard Pond Dam | Dam | 187 | Franklin | 42 38 00 N | 072 14 10 W |
| Packard Street School | School | 82 | Middlesex | 42 23 51 N | 071 34 43 W |
| Packardville | Populated Place | 247 | Hampshire | 42 20 45 N | 072 23 03 W |
| Packet Rock | Island | -3 | Bristol | 41 34 47 N | 070 52 09 W |
| Padanaram Breakwater | Dam | -3 | Bristol | 41 34 25 N | 070 56 23 W |
| Padanaram Breakwater Light | Locale | -3 | Bristol | 41 34 27 N | 070 56 24 W |
| Paddock Cemetery | Cemetery | 3 | Barnstable | 41 44 35 N | 070 10 23 W |
| Paddock Rock | Island | 5 | Essex | 42 33 36 N | 070 44 37 W |
| Paddocks Pond | Lake | 3 | Barnstable | 41 41 00 N | 070 03 43 W |
| Paddy Hill | Summit | 445 | Franklin | 42 29 02 N | 072 49 48 W |
| Page Boulevard Mini-Mall Shopping Center | Locale | 68 | Hampden | 42 08 19 N | 072 33 44 W |
| Page Brook | Stream | | Hampshire | 42 22 53 N | 072 49 05 W |
| Page School | School | 36 | Middlesex | 42 29 43 N | 071 15 41 W |
| Page School | School | 111 | Middlesex | 42 33 56 N | 071 34 43 W |
| Page School | School | 110 | Middlesex | 42 33 58 N | 071 34 48 W |
| Pages Brook | Stream | 35 | Middlesex | 42 31 47 N | 071 18 16 W |