Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Conant Brook Reservoir | Reservoir | 230 | Hampden | 42 04 25 N | 072 17 26 W |
| Conant Hill | Summit | 79 | Middlesex | 42 28 10 N | 071 27 23 W |
| Conant Hill | Summit | 293 | Worcester | 42 33 10 N | 072 13 38 W |
| Conant Library | Building | 196 | Worcester | 42 02 40 N | 071 55 53 W |
| Conant Memorial Park | Park | 68 | Hampshire | 42 13 30 N | 072 43 43 W |
| Conant Playground | Park | 13 | Middlesex | 42 27 24 N | 071 04 46 W |
| Conant Pond | Lake | 177 | Worcester | 42 02 27 N | 071 55 38 W |
| Conaumet Cove | Bay | 17 | Barnstable | 41 40 10 N | 070 28 53 W |
| Conaumet Neck | Cape | 17 | Barnstable | 41 40 07 N | 070 29 12 W |
| Conaumet Point | Cape | 17 | Barnstable | 41 40 25 N | 070 29 08 W |
| Concord | Populated Place | 41 | Middlesex | 42 27 37 N | 071 20 56 W |
| Concord Academy | School | 44 | Middlesex | 42 27 32 N | 071 21 18 W |
| Concord Antiquarian Society | Building | 45 | Middlesex | 42 27 27 N | 071 21 30 W |
| Concord Baptist Church | Church | 10 | Suffolk | 42 20 38 N | 071 04 36 W |
| Concord Battleground | Park | 41 | Middlesex | 42 28 04 N | 071 20 55 W |
| Concord Country Club | Locale | 48 | Middlesex | 42 27 00 N | 071 23 03 W |
| Concord Depot | Locale | 42 | Middlesex | 42 27 24 N | 071 21 27 W |
| Concord Free Public Library | Building | 44 | Middlesex | 42 27 32 N | 071 21 12 W |
| Concord Junction (historical) | Locale | 40 | Middlesex | 42 27 25 N | 071 23 36 W |
| Concord Monument Square-Lexington Road Historic District | Park | 39 | Middlesex | 42 27 42 N | 071 20 56 W |
| Concord Museum | Building | 42 | Middlesex | 42 27 28 N | 071 20 35 W |
| Concord Museum Library | Building | 42 | Middlesex | 42 27 28 N | 071 20 34 W |
| Concord Playground | Park | 40 | Middlesex | 42 27 18 N | 071 21 03 W |
| Concord Post Office | Post Office | 40 | Middlesex | 42 27 32 N | 071 21 01 W |
| Concord Reformatory | School | 42 | Middlesex | 42 27 55 N | 071 23 43 W |
| Concord Reservoir | Reservoir | 73 | Middlesex | 42 27 48 N | 071 21 54 W |
| Concord River | Stream | | Middlesex | 42 38 47 N | 071 18 09 W |
| Concord River Dam | Dam | 37 | Middlesex | 42 35 30 N | 071 16 58 W |
| Concord River Reservoir | Reservoir | 35 | Middlesex | 42 35 30 N | 071 16 58 W |
| Concord River Reservoir | Reservoir | 32 | Middlesex | 42 37 48 N | 071 17 52 W |
| Concord River Reservoir | Reservoir | 23 | Middlesex | 42 38 36 N | 071 18 10 W |
| Concord River Swamp | Swamp | 36 | Middlesex | 42 29 05 N | 071 19 08 W |
| Concord Shopping Center | Locale | 44 | Middlesex | 42 27 17 N | 071 21 25 W |
| Concord Square Historic District | Park | 53 | Middlesex | 42 16 43 N | 071 24 55 W |
| Concord Street Park | Park | 128 | Middlesex | 42 21 05 N | 071 31 20 W |
| Concord Visitor Center | Building | 51 | Middlesex | 42 27 31 N | 071 20 43 W |
| Concord-Acton Industrial Park | Locale | 56 | Middlesex | 42 27 00 N | 071 25 31 W |
| Concord-Carlisle High School | School | 53 | Middlesex | 42 26 53 N | 071 20 50 W |
| Cone Brook | Stream | | Berkshire | 42 20 30 N | 073 22 10 W |
| Cone Brook | Stream | | Berkshire | 42 13 54 N | 073 06 50 W |
| Cone Brook | Stream | | Berkshire | 42 23 37 N | 073 00 34 W |
| Cone Hill | Summit | 365 | Berkshire | 42 21 35 N | 073 22 08 W |
| Cone Hill Cemetery | Cemetery | 348 | Berkshire | 42 21 29 N | 073 22 06 W |
| Cone Rock | Island | -3 | Barnstable | 41 42 39 N | 070 19 00 W |
| Coney Island | Island | 1 | Essex | 42 31 45 N | 070 50 13 W |
| Coney Island Rock | Island | 3 | Essex | 42 31 50 N | 070 50 13 W |
| Coney Ledge | Bar | 0 | Essex | 42 31 33 N | 070 49 58 W |
| Congamond | Populated Place | 73 | Hampden | 42 01 10 N | 072 46 10 W |
| Congamond Lake Heliport | Airport | 69 | Hampden | 42 02 00 N | 072 45 33 W |
| Congamond Lakes | Lake | 68 | Hampden | 42 01 30 N | 072 45 23 W |
| Congamond Lakes Middle Dike | Dam | 69 | Hampden | 42 01 18 N | 072 46 10 W |
| Congamond Lakes Middle Pond | Reservoir | 69 | Hampden | 42 01 18 N | 072 46 10 W |
| Congamond Lakes North Dike | Dam | 77 | Hampden | 42 02 48 N | 072 45 22 W |
| Congamond Lakes North Pond | Reservoir | 77 | Hampden | 42 02 48 N | 072 45 22 W |
| Congamond Lakes South Dike | Dam | 78 | Hampden | 42 00 18 N | 072 46 16 W |
| Congamond Lakes South Pond | Reservoir | 79 | Hampden | 42 00 18 N | 072 46 16 W |
| Congregation Agudas Achim | Church | 17 | Middlesex | 42 21 34 N | 071 12 02 W |
| Congregation Agudas Achim | Church | 133 | Worcester | 42 34 58 N | 071 46 58 W |
| Congregation Agudas Achim | Church | 131 | Worcester | 42 32 17 N | 071 45 41 W |
| Congregation Beth El | Church | 56 | Middlesex | 42 23 07 N | 071 25 17 W |
| Congregation Beth Israel West | Church | 12 | Middlesex | 42 25 40 N | 071 04 42 W |
| Congregation Chabei Shalom | Church | 15 | Norfolk | 42 20 37 N | 071 06 52 W |
| Congregation Church of Christ | Church | 121 | Worcester | 42 32 29 N | 071 44 17 W |
| Congregation Kehillath Israel | Church | 26 | Norfolk | 42 20 40 N | 071 07 34 W |
| Congregation Machseke Torah | Church | 37 | Norfolk | 42 20 19 N | 071 08 22 W |
| Congregation Mishkan Tefila | Church | 54 | Middlesex | 42 19 10 N | 071 10 15 W |
| Congregation Ohabei Shalom | Church | 17 | Norfolk | 42 20 36 N | 071 06 52 W |
| Congregation Shaarei Zedech | Church | 101 | Worcester | 42 25 15 N | 071 41 02 W |
| Congregation Shirat Ha Yam | Church | 12 | Nantucket | 41 16 57 N | 070 05 57 W |
| Congregational Church | Church | 15 | Barnstable | 41 41 10 N | 070 04 36 W |
| Congregational Church | Church | 262 | Berkshire | 42 44 25 N | 073 11 23 W |
| Congress Street Bridge | Bridge | 3 | Suffolk | 42 21 07 N | 071 03 04 W |
| Conlin Hill | Summit | 226 | Worcester | 42 07 57 N | 071 53 53 W |
| Connecticut River Reservoir | Reservoir | 54 | Franklin | 42 36 36 N | 072 33 04 W |
| Connecticut River Reservoir | Reservoir | 61 | Franklin | 42 36 36 N | 072 33 10 W |
| Connecticut River Reservoir | Reservoir | 16 | Hampden | 42 12 48 N | 072 36 04 W |
| Connecticut River Watershed Council Library | Building | 44 | Hampshire | 42 16 34 N | 072 39 24 W |
| Connecticut Valley Historical Museum | Building | 37 | Hampden | 42 06 16 N | 072 35 04 W |
| Connecticut Valley Historical Museum Library | Building | 34 | Hampden | 42 06 16 N | 072 35 11 W |
| Connelly Brook | Stream | | Worcester | 42 25 05 N | 071 46 18 W |
| Connelly Hill | Summit | 133 | Middlesex | 42 12 05 N | 071 29 53 W |
| Connolly Carriage House | Building | 50 | Middlesex | 42 19 25 N | 071 10 11 W |
| Connolly House | Building | 50 | Middlesex | 42 19 23 N | 071 10 16 W |
| Connor Pond | Reservoir | 223 | Worcester | 42 27 42 N | 072 09 52 W |
| Connor Pond Dam | Dam | 224 | Worcester | 42 27 42 N | 072 09 52 W |
| Connor Reservoir | Reservoir | 101 | Hampden | 42 10 07 N | 072 39 32 W |
| Conomo Point | Cape | 10 | Essex | 42 39 00 N | 070 44 43 W |
| Conscience Hill | Summit | 105 | Middlesex | 42 37 20 N | 071 28 28 W |
| Consentino School | School | 56 | Essex | 42 46 14 N | 071 06 12 W |
| Consolidated School | School | 77 | Hampden | 42 03 10 N | 072 46 15 W |
| Conspiracy Island | Island | 1 | Bristol | 41 47 00 N | 071 06 53 W |
| Constitution Hill | Summit | 489 | Berkshire | 42 31 45 N | 073 14 41 W |
| Constitution Museum | Building | 6 | Suffolk | 42 22 26 N | 071 03 19 W |
| Constitution Wharf | Locale | 3 | Suffolk | 42 22 06 N | 071 03 02 W |
| Conte Forum | Building | 55 | Middlesex | 42 20 07 N | 071 10 03 W |
| Conte National Polymer Research Center | Building | 71 | Hampshire | 42 23 40 N | 072 31 35 W |
| Content Brook | Stream | | Middlesex | 42 34 43 N | 071 12 37 W |
| Continental Camp of America Dam Number 1 | Dam | 35 | Plymouth | 41 53 54 N | 070 43 34 W |
| Continental Can of America Dam A | Dam | 8 | Plymouth | 41 46 12 N | 070 47 40 W |
| Convent of the Cenacle | Church | 152 | Worcester | 42 27 20 N | 071 42 23 W |
| Converse Building | Building | 6 | Middlesex | 42 22 38 N | 071 06 53 W |
| Converse Cemetery | Cemetery | 321 | Hampshire | 42 21 11 N | 072 54 24 W |
| Converse Hall | Building | 95 | Hampshire | 42 22 21 N | 072 31 07 W |
| Converse Memorial Building | Building | 6 | Middlesex | 42 25 39 N | 071 01 57 W |
| Converse Middle School | School | 108 | Hampden | 42 09 36 N | 072 19 34 W |
| Converse Point | Cape | 6 | Plymouth | 41 40 45 N | 070 44 58 W |
| Conway | Populated Place | 185 | Franklin | 42 30 35 N | 072 41 58 W |
| Conway Electric Dam | Dam | 109 | Franklin | 42 32 18 N | 072 40 04 W |
| Conway Electric Reservoir | Reservoir | 109 | Franklin | 42 32 18 N | 072 40 04 W |
| Conway Gazebo | Building | 59 | Hampshire | 42 19 10 N | 072 38 13 W |