Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sandy Hook Channel | Channel | 0 | Union | 40 29 02 N | 073 59 52 W |
| Sandy Hook Lighthouse | Locale | 4 | Union | 40 27 41 N | 074 00 08 W |
| Sanford Park | Park | 41 | Union | 40 42 01 N | 074 13 42 W |
| Saybrook Elementary School | School | 14 | Union | 40 41 22 N | 074 13 21 W |
| School Number 1 Elementary School | School | 41 | Union | 40 38 42 N | 074 23 47 W |
| School Number 3 | School | 6 | Union | 40 38 45 N | 074 13 21 W |
| School Number 4 | School | 10 | Union | 40 38 46 N | 074 14 37 W |
| School Number 7 | School | 5 | Union | 40 36 54 N | 074 13 48 W |
| School of the Holy Rosary | School | 41 | Union | 40 39 16 N | 074 11 58 W |
| Science Building | Building | 41 | Union | 40 40 50 N | 074 14 04 W |
| Scotch Hills Country Club | Locale | 67 | Union | 40 39 29 N | 074 22 40 W |
| Scotch Plains | Populated Place | 50 | Union | 40 39 19 N | 074 23 24 W |
| Scotch Plains Bapitst Church | School | 41 | Union | 40 39 08 N | 074 23 58 W |
| Scotch Plains Baptist School | School | 41 | Union | 40 39 08 N | 074 23 58 W |
| Scotch Plains Grade School (historical) | School | 41 | Union | 40 36 57 N | 074 22 10 W |
| Scotch Plains Municipal Building | Building | 41 | Union | 40 39 00 N | 074 23 51 W |
| Scotch Plains Park | Park | 40 | Union | 40 38 34 N | 074 24 11 W |
| Scotch Plains Post Office | Post Office | 41 | Union | 40 38 57 N | 074 23 53 W |
| Scotch Plains Public Library | Building | 41 | Union | 40 39 06 N | 074 23 50 W |
| Scotch Plains Public School Number 3 (historical) | School | 73 | Union | 40 39 18 N | 074 22 25 W |
| Scotch Plains School Number 1 (historical) | School | 41 | Union | 40 38 57 N | 074 23 44 W |
| Scotch Plains School Number 4 | School | 55 | Union | 40 38 28 N | 074 22 49 W |
| Scotch Plains-Fanwood High School | School | 41 | Union | 40 39 13 N | 074 23 02 W |
| Second Baptist Church | Church | 41 | Union | 40 39 31 N | 074 15 59 W |
| Second Baptist Church | Church | 41 | Union | 40 36 17 N | 074 16 11 W |
| Second Presbyterian Church | Church | 41 | Union | 40 39 56 N | 074 12 49 W |
| Second Presbyterian Church | Church | 41 | Union | 40 36 11 N | 074 16 33 W |
| Second Ward Park | Park | 11 | Union | 40 37 38 N | 074 15 46 W |
| Seeleys Pond | Reservoir | 62 | Union | 40 40 03 N | 074 24 13 W |
| Seeleys Pond Dam | Dam | 62 | Union | 40 40 03 N | 074 24 13 W |
| Serbian Orthodox Church of the Holy Ascension | Church | 41 | Union | 40 39 33 N | 074 12 58 W |
| Seventh Day Adventist Church | Church | 41 | Union | 40 39 59 N | 074 14 31 W |
| Shackamaxon Dam | Dam | 23 | Union | 40 37 42 N | 074 21 02 W |
| Shackamaxon Golf Course | Locale | 30 | Union | 40 37 42 N | 074 21 07 W |
| Shackamaxon Lake | Reservoir | 23 | Union | 40 37 42 N | 074 21 02 W |
| Shackamaxon School | School | 37 | Union | 40 37 55 N | 074 21 56 W |
| Sherman Elementary School | School | 24 | Union | 40 39 59 N | 074 15 17 W |
| Sherman School | School | 24 | Union | 40 39 00 N | 074 18 19 W |
| Shiloh Baptist Church | Church | 41 | Union | 40 39 49 N | 074 13 09 W |
| Siloam Prebyterian Church | Church | 41 | Union | 40 39 48 N | 074 12 45 W |
| Sinai School | School | 31 | Union | 40 42 06 N | 074 13 20 W |
| South Branch Rahway River | Stream | | Union | 40 36 02 N | 074 16 23 W |
| South Station | Locale | 9 | Union | 40 39 30 N | 074 13 14 W |
| Sozio Hall | Building | 41 | Union | 40 40 32 N | 074 14 05 W |
| Springfield | Populated Place | 41 | Union | 40 43 23 N | 074 18 39 W |
| Springfield Station | Locale | 30 | Union | 40 42 35 N | 074 19 01 W |
| Staten Island Junction | Populated Place | 26 | Union | 40 39 32 N | 074 17 14 W |
| Stein Field | Park | 41 | Union | 40 35 50 N | 074 17 35 W |
| Stony Hill | Populated Place | 125 | Union | 40 40 13 N | 074 25 39 W |
| Suburban Golf Course | Locale | 24 | Union | 40 41 20 N | 074 15 27 W |
| Summit | Populated Place | 62 | Union | 40 44 29 N | 074 21 35 W |
| Summit Golf Course (historical) | Locale | 41 | Union | 40 41 06 N | 074 23 26 W |
| Summit Middle School | School | 110 | Union | 40 42 48 N | 074 21 36 W |
| Summit Post Office | Post Office | 41 | Union | 40 43 00 N | 074 21 34 W |
| Summit Senior High School | School | 95 | Union | 40 43 13 N | 074 22 16 W |
| Summit Station | Locale | 115 | Union | 40 43 00 N | 074 21 29 W |
| Summit Sub-Station | Locale | 41 | Union | 40 43 59 N | 074 22 43 W |
| Surprise Lake Dam | Dam | 82 | Union | 40 41 07 N | 074 22 45 W |
| Swash Channel | Channel | -3 | Union | 40 30 39 N | 074 01 27 W |
| Synagogue B-nai Israel | Church | 41 | Union | 40 39 48 N | 074 12 24 W |
| Tamaques Elementary School | School | 41 | Union | 40 38 05 N | 074 20 16 W |
| Tamaques Reservation | Park | 24 | Union | 40 37 44 N | 074 20 13 W |
| Temple Beth-El | Church | 41 | Union | 40 40 51 N | 074 12 45 W |
| Temple Shomrel Torah | Church | 12 | Union | 40 41 05 N | 074 13 11 W |
| Temple Sinai | Church | 41 | Union | 40 43 27 N | 074 21 22 W |
| Terminal A | Building | 41 | Union | 40 41 16 N | 074 10 56 W |
| Terrill Middle School | School | 41 | Union | 40 37 38 N | 074 22 35 W |
| Thelma L Sandmeier Elementary School | School | 41 | Union | 40 41 29 N | 074 19 27 W |
| Theodore Roosevelt Elementary School | School | 6 | Union | 40 38 46 N | 074 12 57 W |
| Third Presbyterian Church | Church | 41 | Union | 40 39 51 N | 074 12 42 W |
| Thomas A Edison Vocational School | School | 2 | Union | 40 39 02 N | 074 12 42 W |
| Thomas Edison Intermediate School | School | 41 | Union | 40 38 18 N | 074 20 31 W |
| Thomas Jefferson High School | School | 6 | Union | 40 39 46 N | 074 12 37 W |
| Thomas P Hughes Elementary School | School | 100 | Union | 40 40 36 N | 074 25 44 W |
| Town Brook | Stream | | Union | 40 24 57 N | 074 06 07 W |
| Town of Westfield | Civil | 36 | Union | 40 39 06 N | 074 20 38 W |
| Townley Church | Church | 17 | Union | 40 41 00 N | 074 14 48 W |
| Townley House | Building | 41 | Union | 40 40 54 N | 074 14 04 W |
| Townsend Hall | Building | 41 | Union | 40 40 48 N | 074 14 08 W |
| Township of Berkeley Heights | Civil | 133 | Union | 40 40 30 N | 074 25 29 W |
| Township of Clark | Civil | 19 | Union | 40 37 40 N | 074 17 59 W |
| Township of Cranford | Civil | 25 | Union | 40 39 30 N | 074 18 14 W |
| Township of Hillside | Civil | 25 | Union | 40 42 00 N | 074 13 44 W |
| Township of Scotch Plains | Civil | 65 | Union | 40 39 30 N | 074 22 44 W |
| Township of Springfield | Civil | 56 | Union | 40 42 00 N | 074 19 59 W |
| Township of Union | Civil | 37 | Union | 40 42 00 N | 074 15 59 W |
| Township of Winfield | Civil | 14 | Union | 40 38 10 N | 074 17 19 W |
| Tremley | Populated Place | 5 | Union | 40 36 47 N | 074 13 48 W |
| Tremley Park | Park | 4 | Union | 40 36 56 N | 074 13 45 W |
| Tremley Point | Populated Place | 0 | Union | 40 36 06 N | 074 12 18 W |
| Tremont Park | Populated Place | 90 | Union | 40 42 18 N | 074 21 13 W |
| Trinitas Hospital New Point Campus | Hospital | 41 | Union | 40 39 33 N | 074 11 51 W |
| Trinitas Hospital Williamson Campus | Hospital | 41 | Union | 40 39 34 N | 074 12 53 W |
| Trinity Christian Center | Church | 10 | Union | 40 39 49 N | 074 13 47 W |
| Trinity Church | Church | 41 | Union | 40 39 26 N | 074 17 52 W |
| Trinity Episcopal Church | Church | 41 | Union | 40 40 12 N | 074 12 54 W |
| Trinity United Methodist Church | Church | 41 | Union | 40 36 22 N | 074 16 30 W |
| Tussels | Airport | 17 | Union | 40 36 50 N | 074 20 34 W |
| Unami Park | Park | 24 | Union | 40 38 38 N | 074 19 12 W |
| Union | Populated Place | 30 | Union | 40 41 51 N | 074 15 48 W |
| Union Baptist Church | Church | 41 | Union | 40 40 00 N | 074 12 33 W |
| Union Catholic High School | School | 41 | Union | 40 37 31 N | 074 21 29 W |
| Union College | School | 25 | Union | 40 40 03 N | 074 19 12 W |
| Union County | Airport | 30 | Union | 40 42 00 N | 074 17 59 W |
| Union County | Civil | 13 | Union | 40 38 00 N | 074 15 59 W |
| Union County Administrative Building | Building | 41 | Union | 40 39 43 N | 074 13 02 W |
| Union County Courthouse | Building | 41 | Union | 40 39 44 N | 074 12 56 W |
| Union County Vocational Technical School | School | 41 | Union | 40 37 00 N | 074 21 29 W |
| Union Junior College | School | 21 | Union | 40 39 34 N | 074 18 18 W |
| Union Rail Station | Locale | 41 | Union | 40 41 03 N | 074 14 18 W |