Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Holy Trinity High School | School | 42 | Union | 40 39 08 N | 074 21 02 W |
| Holy Trinity Roman Catholic Church | Church | 41 | Union | 40 38 51 N | 074 20 55 W |
| Howard B Brunner Elementary School | School | 41 | Union | 40 39 02 N | 074 22 48 W |
| Howard Field | Park | 41 | Union | 40 35 49 N | 074 15 55 W |
| Hubbard Middle School | School | 25 | Union | 40 36 21 N | 074 25 24 W |
| Huntley Station | Locale | 114 | Union | 40 43 07 N | 074 20 31 W |
| Hurden-Looker Elementary School | School | 15 | Union | 40 41 46 N | 074 13 60 W |
| Hutchinson Hall | Building | 41 | Union | 40 40 47 N | 074 14 01 W |
| Iglesia Cristiana Hosanna | Church | 41 | Union | 40 39 41 N | 074 14 22 W |
| Iglesia Presbyterian Hispana | Church | 41 | Union | 40 37 32 N | 074 25 03 W |
| Immaculate Conception Church | Church | 6 | Union | 40 40 21 N | 074 12 59 W |
| Immaculate Conception School | School | 41 | Union | 40 40 20 N | 074 12 60 W |
| Immaculate Conception Ukrainian Catholic Church | Church | 41 | Union | 40 41 41 N | 074 14 10 W |
| Immaculate Heart of Mary Roman Catholic Church | Church | 41 | Union | 40 39 02 N | 074 11 22 W |
| Interchange 13 | Crossing | 5 | Union | 40 38 32 N | 074 12 33 W |
| Interchange 135 | Crossing | 41 | Union | 40 37 38 N | 074 18 16 W |
| Interchange 136 | Crossing | 41 | Union | 40 38 31 N | 074 17 20 W |
| Interchange 137 | Crossing | 41 | Union | 40 39 36 N | 074 17 13 W |
| Interchange 138 | Crossing | 41 | Union | 40 40 46 N | 074 16 41 W |
| Interchange 139 | Crossing | 41 | Union | 40 41 23 N | 074 16 15 W |
| Interchange 139A | Crossing | 41 | Union | 40 41 31 N | 074 15 59 W |
| Interchange 13A | Crossing | 41 | Union | 40 39 57 N | 074 10 54 W |
| Interchange 140 | Crossing | 41 | Union | 40 41 41 N | 074 15 41 W |
| Interchange 141 | Crossing | 41 | Union | 40 41 57 N | 074 15 12 W |
| Interchange 142 | Crossing | 20 | Union | 40 42 34 N | 074 14 44 W |
| Interchange 44 | Crossing | 41 | Union | 40 40 50 N | 074 23 40 W |
| Interchange 45 | Crossing | 41 | Union | 40 41 51 N | 074 22 03 W |
| Interchange 48 | Crossing | 41 | Union | 40 42 43 N | 074 19 25 W |
| Interchange 49 | Crossing | 41 | Union | 40 42 51 N | 074 17 52 W |
| Interchange 50 | Crossing | 41 | Union | 40 42 51 N | 074 16 53 W |
| Interchange 51 | Crossing | 41 | Union | 40 42 49 N | 074 16 34 W |
| Interchange 54 | Crossing | 41 | Union | 40 42 31 N | 074 13 49 W |
| Irving School (historical) | School | 21 | Union | 40 36 12 N | 074 26 08 W |
| Irwin Playground | Park | 66 | Union | 40 41 25 N | 074 20 23 W |
| J Ackerman Coles Elementary School | School | 41 | Union | 40 37 31 N | 074 22 52 W |
| Jackson Park | Park | 7 | Union | 40 39 07 N | 074 11 14 W |
| Jacksons Pond | Reservoir | 12 | Union | 40 37 42 N | 074 17 07 W |
| Jacksons Pond Dam | Dam | 12 | Union | 40 37 42 N | 074 17 07 W |
| James Caldwell Elementary School | School | 41 | Union | 40 42 39 N | 074 18 53 W |
| James E Kirk Community Center | Building | 41 | Union | 40 39 24 N | 074 12 05 W |
| Janet Memorial Elizabeth Orphan Asylum (historical) | Building | 41 | Union | 40 40 45 N | 074 12 58 W |
| Jefferson Elementary School | School | 18 | Union | 40 36 17 N | 074 26 51 W |
| Jefferson Elementary School | School | 37 | Union | 40 38 13 N | 074 19 42 W |
| Jefferson Elementary School | School | 115 | Union | 40 42 23 N | 074 21 03 W |
| Jefferson Park | Park | 9 | Union | 40 40 16 N | 074 12 30 W |
| Jersey Gardens Mall Shopping Center | Locale | 41 | Union | 40 40 00 N | 074 10 33 W |
| Jewish Community Center | Church | 41 | Union | 40 43 10 N | 074 21 58 W |
| John E Runnells Hospital | Hospital | 92 | Union | 40 39 39 N | 074 25 13 W |
| John Marshall Elementary School | School | 6 | Union | 40 39 32 N | 074 11 27 W |
| Jonathan Dayton High School | School | 30 | Union | 40 42 23 N | 074 18 51 W |
| Joseph E Soehl Middle School | School | 41 | Union | 40 38 11 N | 074 15 17 W |
| Julian Station | Locale | 6 | Union | 40 40 03 N | 074 13 01 W |
| Kawameeh Middle School | School | 15 | Union | 40 41 32 N | 074 15 38 W |
| Kawameeh Park | Park | 16 | Union | 40 41 30 N | 074 15 48 W |
| Kean University of New Jersey | School | 15 | Union | 40 40 46 N | 074 14 08 W |
| Kean University of New Jersey East Campus | School | 41 | Union | 40 40 48 N | 074 13 27 W |
| Kellogg Park | Park | 8 | Union | 40 40 52 N | 074 12 12 W |
| Kenilworth | Populated Place | 32 | Union | 40 40 35 N | 074 17 27 W |
| Kenilworth Post Office | Post Office | 41 | Union | 40 40 37 N | 074 17 11 W |
| Kenilworth Public Library | Building | 41 | Union | 40 40 35 N | 074 17 24 W |
| Kent Place School | School | 53 | Union | 40 43 12 N | 074 21 58 W |
| Kingdom Hall Jehovahs Witnesses | Church | 41 | Union | 40 36 17 N | 074 26 03 W |
| Kings Creek | Stream | | Union | 40 36 05 N | 074 14 56 W |
| Lagrande Park | Park | 46 | Union | 40 38 16 N | 074 23 02 W |
| Lake Surprise | Reservoir | 82 | Union | 40 41 07 N | 074 22 45 W |
| Lenape Park | Park | 23 | Union | 40 40 44 N | 074 19 14 W |
| Leonard V Moore Middle School | School | 41 | Union | 40 39 04 N | 074 15 54 W |
| Liberty Baptist Church | Church | 41 | Union | 40 39 30 N | 074 11 31 W |
| Liberty Hall Heliport | Airport | 18 | Union | 40 40 30 N | 074 14 42 W |
| Liberty Hall Museum | Building | 41 | Union | 40 40 36 N | 074 13 38 W |
| Liberty Square | Populated Place | 10 | Union | 40 39 00 N | 074 11 38 W |
| Liberty Theatre | Building | 41 | Union | 40 39 44 N | 074 12 44 W |
| Lincoln Elementary School | School | 29 | Union | 40 39 16 N | 074 19 37 W |
| Lincoln School | School | 36 | Union | 40 38 44 N | 074 20 32 W |
| Lincoln School | School | 23 | Union | 40 39 08 N | 074 17 48 W |
| Lincoln School | School | 68 | Union | 40 42 28 N | 074 24 13 W |
| Lincoln School | School | 55 | Union | 40 44 50 N | 074 21 41 W |
| Lincoln School (historical) | School | 5 | Union | 40 36 33 N | 074 17 07 W |
| Lincoln-Hubbard Elementary School | School | 41 | Union | 40 43 15 N | 074 21 38 W |
| Linden | Populated Place | 5 | Union | 40 37 19 N | 074 14 41 W |
| Linden Adult Education School | School | 41 | Union | 40 38 06 N | 074 15 55 W |
| Linden Airport | Airport | 7 | Union | 40 37 03 N | 074 14 39 W |
| Linden Free Public Library | Building | 41 | Union | 40 38 06 N | 074 15 29 W |
| Linden High School | School | 41 | Union | 40 38 06 N | 074 15 55 W |
| Linden Number One Dam | Dam | 3 | Union | 40 38 03 N | 074 12 21 W |
| Linden Park Cemetery | Cemetery | 8 | Union | 40 38 04 N | 074 14 31 W |
| Linden Post Office | Post Office | 41 | Union | 40 37 58 N | 074 15 21 W |
| Linden Presbyterian Church | Church | 41 | Union | 40 38 21 N | 074 16 10 W |
| Linden Station | Locale | 7 | Union | 40 37 47 N | 074 15 11 W |
| Linden United Methodist Church | Church | 41 | Union | 40 37 55 N | 074 15 20 W |
| Lions Municipal Park | Park | 41 | Union | 40 42 08 N | 074 23 42 W |
| Livingston Avenue Elementary School | School | 41 | Union | 40 38 43 N | 074 18 33 W |
| Livingston Elementary School | School | 25 | Union | 40 41 18 N | 074 15 03 W |
| Lockett Memorial Church of God | Church | 41 | Union | 40 38 39 N | 074 15 10 W |
| Locust Grove Country Club (historical) | Locale | 41 | Union | 40 36 33 N | 074 19 55 W |
| Lorraine Station | Locale | 19 | Union | 40 39 46 N | 074 14 57 W |
| Madden Field | Park | 41 | Union | 40 35 47 N | 074 16 25 W |
| Madison Avenue Park | Park | 41 | Union | 40 36 53 N | 074 17 34 W |
| Madison Avenue Presbyterian Church | Church | 12 | Union | 40 40 31 N | 074 12 18 W |
| Madison Elementary School | School | 11 | Union | 40 36 35 N | 074 17 38 W |
| Madison Hill | Populated Place | 17 | Union | 40 36 40 N | 074 18 32 W |
| Madison-Monroe Elementary School | School | 7 | Union | 40 40 48 N | 074 12 07 W |
| Marquis de Lafayette Elementary School | School | 11 | Union | 40 40 24 N | 074 12 15 W |
| Marshes Creek | Stream | | Union | 40 36 04 N | 074 13 15 W |
| Mattano Park | Park | 2 | Union | 40 38 51 N | 074 12 26 W |
| Maxson Middle School | School | 36 | Union | 40 37 32 N | 074 24 11 W |
| McGillvray Park | Park | 41 | Union | 40 38 38 N | 074 13 19 W |
| McKinley Elementary School | School | 42 | Union | 40 38 42 N | 074 21 13 W |
| McKinley School | School | 28 | Union | 40 40 37 N | 074 17 40 W |
| Memorial Field | Park | 41 | Union | 40 39 00 N | 074 17 20 W |