Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Smith Pond | Reservoir | 332 | Grafton | 43 35 12 N | 072 06 10 W |
| Smith Pond Bog | Swamp | 164 | Merrimack | 43 11 07 N | 071 40 43 W |
| Smith Pond Dam | Dam | 332 | Grafton | 43 35 12 N | 072 06 10 W |
| Smith River | Stream | | Grafton | 43 33 49 N | 071 43 41 W |
| Smith State Forest | Forest | 58 | Rockingham | 43 06 17 N | 071 04 28 W |
| Smiths Corner | Populated Place | 171 | Merrimack | 43 21 06 N | 071 47 25 W |
| Smiths Corner Historic District | Park | 46 | Rockingham | 42 53 36 N | 070 59 18 W |
| Smiths Pond | Lake | 145 | Merrimack | 43 07 45 N | 071 20 49 W |
| Smithtown | Populated Place | 16 | Rockingham | 42 52 35 N | 070 52 12 W |
| Smithtown Cemetery | Cemetery | 23 | Rockingham | 42 52 26 N | 070 52 10 W |
| Smithville | Populated Place | 324 | Hillsborough | 42 44 15 N | 071 52 16 W |
| Smithville Cemetery | Cemetery | 327 | Hillsborough | 42 44 01 N | 071 52 39 W |
| Smithville Reservoir | Reservoir | 327 | Hillsborough | 42 44 06 N | 071 52 52 W |
| Smoky Camp Brook | Stream | | Coos | 44 44 49 N | 071 10 00 W |
| Smutty Hollow | Valley | | Coos | 44 19 23 N | 072 00 10 W |
| Smyth Public Library | Building | 193 | Rockingham | 43 03 47 N | 071 18 08 W |
| Smyth Road School | School | 113 | Hillsborough | 43 00 20 N | 071 26 38 W |
| Snag Pond | Lake | 637 | Coos | 45 16 07 N | 071 05 43 W |
| Snake Pond | Lake | 153 | Carroll | 43 40 55 N | 071 04 40 W |
| Snake Pond | Lake | 162 | Carroll | 43 57 25 N | 071 06 52 W |
| Snapper Ski Trail | Trail | 844 | Grafton | 43 59 50 N | 071 49 36 W |
| Snow Brook | Stream | | Carroll | 43 59 52 N | 071 02 47 W |
| Snow Brook | Stream | | Cheshire | 42 49 19 N | 072 25 06 W |
| Snow Brook | Stream | | Cheshire | 42 45 56 N | 072 23 38 W |
| Snow Mountain | Summit | 571 | Sullivan | 43 34 13 N | 072 10 54 W |
| Snow Mountain Trail | Trail | 653 | Grafton | 43 57 26 N | 071 29 29 W |
| Snow Pond | Lake | 113 | Merrimack | 43 16 18 N | 071 32 07 W |
| Snows Brook | Stream | | Grafton | 43 56 55 N | 071 30 39 W |
| Snows Brook Trail | Trail | 647 | Grafton | 43 56 35 N | 071 28 33 W |
| Snows Mountain | Ridge | 803 | Grafton | 43 56 54 N | 071 28 41 W |
| Snowvillage Ski Touring Center | Locale | 361 | Carroll | 43 53 34 N | 071 02 51 W |
| Snowville | Populated Place | 174 | Carroll | 43 54 45 N | 071 03 28 W |
| Snumshire | Populated Place | 148 | Sullivan | 43 14 54 N | 072 24 55 W |
| Snyder Brook | Stream | | Coos | 44 22 27 N | 071 17 08 W |
| Snyders Hill | Populated Place | 124 | Merrimack | 43 17 16 N | 071 42 42 W |
| Society for the Preservation of New England Antiquities | Building | 6 | Rockingham | 43 04 26 N | 070 45 28 W |
| Society of Friends Meeting House | Church | 26 | Strafford | 43 11 28 N | 070 52 24 W |
| Sodom Hill | Summit | 360 | Hillsborough | 43 06 16 N | 071 51 17 W |
| Sokokis Brook | Stream | | Coos | 44 15 41 N | 071 23 04 W |
| Soldiers Cemetery | Cemetery | 69 | Rockingham | 42 53 37 N | 071 06 37 W |
| Solon Mansfield Memorial Library | Building | 321 | Hillsborough | 42 49 15 N | 071 51 06 W |
| Somerset Plaza Shopping Center | Locale | 60 | Hillsborough | 42 46 48 N | 071 29 52 W |
| Somersworth | Populated Place | 74 | Strafford | 43 15 42 N | 070 51 55 W |
| Somersworth Cemetery | Cemetery | 66 | Strafford | 43 15 24 N | 070 52 55 W |
| Somersworth City Hall | Building | 63 | Strafford | 43 15 32 N | 070 51 44 W |
| Somersworth High School | School | 64 | Strafford | 43 15 22 N | 070 52 33 W |
| Somersworth Middle School | School | 62 | Strafford | 43 15 18 N | 070 52 27 W |
| Somersworth Pentecostal Church | Church | 72 | Strafford | 43 15 47 N | 070 51 53 W |
| Somersworth Public Library | Building | 61 | Strafford | 43 15 46 N | 070 51 50 W |
| Somersworth Shopping Center | Locale | 61 | Strafford | 43 15 43 N | 070 51 48 W |
| Sondogardy Pond | Lake | 125 | Merrimack | 43 23 16 N | 071 36 48 W |
| Soo Nipi Park | Locale | 335 | Merrimack | 43 23 13 N | 072 02 27 W |
| Sosman Trail | Trail | 1158 | Grafton | 43 57 47 N | 071 33 28 W |
| Soucook River | Stream | | Merrimack | 43 09 32 N | 071 29 37 W |
| Soucook River State Forest | Forest | 123 | Merrimack | 43 16 13 N | 071 28 20 W |
| Souhegan Cooperative High School | School | 71 | Hillsborough | 42 49 27 N | 071 34 35 W |
| Souhegan River | Stream | | Hillsborough | 42 51 41 N | 071 29 14 W |
| Souhegan River Reservoir | Reservoir | 30 | Hillsborough | 42 51 36 N | 071 29 34 W |
| Souhegan River Reservoir | Reservoir | 107 | Hillsborough | 42 50 18 N | 071 43 40 W |
| Souhegan River Reservoir | Reservoir | 70 | Hillsborough | 42 50 12 N | 071 38 46 W |
| Souhegan River Reservoir Number 13 | Reservoir | 300 | Hillsborough | 42 45 54 N | 071 50 40 W |
| Souhegan River Watershed Dam Number 10A | Dam | 262 | Hillsborough | 42 51 00 N | 071 48 10 W |
| Souhegan River Watershed Dam Number 12A | Dam | 267 | Hillsborough | 42 47 36 N | 071 49 40 W |
| Souhegan River Watershed Dam Number 13 | Dam | 300 | Hillsborough | 42 45 54 N | 071 50 40 W |
| Souhegan River Watershed Dam Number 14 | Dam | 324 | Hillsborough | 42 45 54 N | 071 51 34 W |
| Souhegan River Watershed Dam Number 15 | Dam | 270 | Hillsborough | 42 47 48 N | 071 48 16 W |
| Souhegan River Watershed Dam Number 19 | Dam | 297 | Hillsborough | 42 43 24 N | 071 50 52 W |
| Souhegan River Watershed Dam Number 25B | Dam | 233 | Hillsborough | 42 49 18 N | 071 49 10 W |
| Souhegan River Watershed Dam Number 26 | Dam | 272 | Hillsborough | 42 50 30 N | 071 49 58 W |
| Souhegan River Watershed Dam Number 28 | Dam | 256 | Hillsborough | 42 53 06 N | 071 48 46 W |
| Souhegan River Watershed Dam Number 33 | Dam | 211 | Hillsborough | 42 51 36 N | 071 44 58 W |
| Souhegan River Watershed Dam Number 35 | Dam | 327 | Hillsborough | 42 44 06 N | 071 52 52 W |
| Souhegan River Watershed Dam Number 8 | Dam | 211 | Hillsborough | 42 53 06 N | 071 46 04 W |
| Souhegan River Watershed Dike Number 12A | Dam | 267 | Hillsborough | 42 48 06 N | 071 50 10 W |
| Souhegan River Watershed Dike Number 13 | Dam | 293 | Hillsborough | 42 45 54 N | 071 50 34 W |
| Souhegan River Watershed Reservoir Number 13 | Reservoir | 294 | Hillsborough | 42 45 54 N | 071 50 34 W |
| South Acworth | Populated Place | 245 | Sullivan | 43 11 27 N | 072 17 07 W |
| South Alexandria | Populated Place | 194 | Grafton | 43 33 27 N | 071 47 41 W |
| South Baldface | Summit | 1084 | Carroll | 44 13 50 N | 071 04 40 W |
| South Barnstead | Populated Place | 231 | Belknap | 43 18 54 N | 071 13 42 W |
| South Barrington | Populated Place | 93 | Strafford | 43 10 56 N | 071 02 03 W |
| South Bay | Bay | 499 | Coos | 45 04 12 N | 071 15 13 W |
| South Bow | Populated Place | 246 | Merrimack | 43 05 24 N | 071 31 06 W |
| South Bow School (historical) | School | 238 | Merrimack | 43 05 16 N | 071 31 05 W |
| South Branch Ashuelot River | Stream | | Cheshire | 42 53 21 N | 072 16 56 W |
| South Branch Baker River | Stream | | Grafton | 43 50 10 N | 071 53 37 W |
| South Branch Baker River Reservoir | Reservoir | 326 | Grafton | 43 46 30 N | 071 54 52 W |
| South Branch Gale River | Stream | | Grafton | 44 14 37 N | 071 38 17 W |
| South Branch Horne Brook | Stream | | Coos | 44 29 10 N | 071 06 28 W |
| South Branch Israel River | Stream | | Coos | 44 21 36 N | 071 23 40 W |
| South Branch Jacobs Brook | Stream | | Grafton | 43 51 59 N | 072 02 26 W |
| South Branch Little Dead Diamond River | Stream | | Coos | 44 57 54 N | 071 08 33 W |
| South Branch Lyman Brook | Stream | | Coos | 44 45 58 N | 071 32 31 W |
| South Branch Mad River | Stream | | Coos | 44 17 10 N | 071 00 20 W |
| South Branch Piscataquog River | Stream | | Hillsborough | 43 01 21 N | 071 37 16 W |
| South Branch Souhegan River | Stream | | Hillsborough | 42 43 51 N | 071 50 47 W |
| South Branch Stearns Brook | Stream | | Coos | 44 31 57 N | 071 06 21 W |
| South Branch Sugar River | Stream | | Sullivan | 43 21 44 N | 072 10 27 W |
| South Brook | Stream | | Carroll | 43 45 51 N | 071 17 07 W |
| South Brookline | Populated Place | 76 | Hillsborough | 42 42 56 N | 071 39 40 W |
| South Carter Mountain | Summit | 1347 | Coos | 44 17 23 N | 071 10 34 W |
| South Cemetery | Cemetery | 331 | Cheshire | 42 44 36 N | 072 16 19 W |
| South Cemetery | Cemetery | 139 | Hillsborough | 42 43 51 N | 071 35 27 W |
| South Charlestown | Populated Place | 98 | Sullivan | 43 10 46 N | 072 26 14 W |
| South Chatham | Populated Place | 134 | Carroll | 44 06 04 N | 071 00 25 W |
| South Church Unitarian Universalist Church | Church | 6 | Rockingham | 43 04 31 N | 070 45 27 W |
| South Columbia School | School | 298 | Coos | 44 47 23 N | 071 34 21 W |
| South Congregational Church | Church | 87 | Merrimack | 43 12 10 N | 071 32 19 W |
| South Congregational Church | Church | 238 | Sullivan | 43 21 40 N | 072 10 22 W |
| South Conway | Populated Place | 188 | Carroll | 43 57 47 N | 071 01 21 W |