Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Saint Marys Lake | Reservoir | 19 | St. Mary's | 38 15 09 N | 076 32 02 W |
| Saint Marys Methodist Church | Church | 7 | Talbot | 38 45 43 N | 076 04 32 W |
| Saint Marys Middle School | School | | Anne Arundel | 38 58 30 N | 076 29 19 W |
| Saint Marys Nursing Home | Hospital | 28 | St. Mary's | 38 17 54 N | 076 38 11 W |
| Saint Marys of the Assumption School | School | 43 | Prince George's | 38 49 31 N | 076 44 58 W |
| Saint Marys on the Severn Church | Church | 19 | Anne Arundel | 39 02 53 N | 076 34 30 W |
| Saint Marys Orphanage | Building | 105 | Baltimore (city) | 39 20 32 N | 076 38 04 W |
| Saint Marys Parish House | Church | 90 | Baltimore (city) | 39 20 12 N | 076 38 00 W |
| Saint Marys River | Stream | | St. Mary's | 38 06 08 N | 076 26 32 W |
| Saint Marys River Estates | Populated Place | 12 | St. Mary's | 38 11 47 N | 076 27 38 W |
| Saint Marys River State Park | Park | 26 | St. Mary's | 38 16 04 N | 076 29 57 W |
| Saint Marys River Watershed Number 1 Dam | Dam | 19 | Allegany | 38 15 06 N | 076 32 05 W |
| Saint Marys Roman Catholic Church | Church | 6 | Anne Arundel | 38 58 28 N | 076 29 16 W |
| Saint Marys Roman Catholic Church | Church | 112 | Baltimore (city) | 39 21 26 N | 076 36 37 W |
| Saint Marys Roman Catholic Church | Church | 4 | Dorchester | 38 34 27 N | 076 04 37 W |
| Saint Marys School | School | 239 | Allegany | 39 38 22 N | 078 45 33 W |
| Saint Marys School | School | 113 | Baltimore (city) | 39 21 27 N | 076 36 39 W |
| Saint Marys School | School | 51 | Charles | 38 32 19 N | 076 50 11 W |
| Saint Marys School | School | 133 | Montgomery | 39 04 53 N | 077 08 38 W |
| Saint Marys School | School | 44 | Prince George's | 38 56 49 N | 076 53 22 W |
| Saint Marys School | School | 61 | Prince George's | 39 06 30 N | 076 51 19 W |
| Saint Marys School | School | 174 | Washington | 39 38 39 N | 077 43 28 W |
| Saint Marys Seminary | School | 32 | Baltimore (city) | 39 17 46 N | 076 37 24 W |
| Saint Marys Seminary | School | 125 | Baltimore (city) | 39 21 38 N | 076 38 24 W |
| Saint Marys Square | Park | 3 | Talbot | 38 47 00 N | 076 13 22 W |
| Saint Marys Square Museum | Building | 3 | Talbot | 38 47 02 N | 076 13 20 W |
| Saint Marys Square Shopping Center | Locale | 25 | St. Mary's | 38 15 32 N | 076 27 52 W |
| Saint Marys Star of the Sea Catholic Church | Church | 2 | Worcester | 38 19 49 N | 075 05 14 W |
| Saint Marys Star of the Sea Church | Church | 0 | Dorchester | 38 23 08 N | 076 14 58 W |
| Saint Marys Star of the Sea Roman Catholic Church | Church | 20 | Baltimore (city) | 39 16 27 N | 076 36 32 W |
| Saint Marys Star of the Sea School | School | 20 | Baltimore (city) | 39 16 28 N | 076 36 33 W |
| Saint Marys Star of the Sea School | School | 50 | Charles | 38 37 09 N | 077 05 17 W |
| Saint Marys United Church of Christ | Church | 218 | Carroll | 39 41 01 N | 077 02 48 W |
| Saint Mathews Church | Church | 49 | Charles | 38 30 14 N | 076 56 42 W |
| Saint Matthew Lutheran Church | Church | 71 | Baltimore (city) | 39 18 48 N | 076 38 14 W |
| Saint Matthew Lutheran Church | Church | 188 | Carroll | 39 37 57 N | 077 02 50 W |
| Saint Matthew Lutheran Church | Church | 91 | Harford | 39 32 39 N | 076 19 30 W |
| Saint Matthew United Methodist Church | Church | 4 | Worcester | 38 07 08 N | 075 20 29 W |
| Saint Matthews Cemetery | Cemetery | 117 | Frederick | 39 20 38 N | 077 28 31 W |
| Saint Matthews Church | Church | 117 | Frederick | 39 20 38 N | 077 28 30 W |
| Saint Matthews Church | Church | 10 | Worcester | 38 27 01 N | 075 14 07 W |
| Saint Matthews Episcopal Church | Church | 44 | Baltimore (city) | 39 18 38 N | 076 35 51 W |
| Saint Matthews Episcopal Church | Church | 725 | Garrett | 39 24 34 N | 079 24 29 W |
| Saint Matthews Episcopal Church | Church | 52 | Prince George's | 38 57 44 N | 076 57 21 W |
| Saint Matthews Hall | School | 50 | Prince George's | 38 57 39 N | 076 45 55 W |
| Saint Matthews Lutheran Church | Church | 48 | Baltimore (city) | 39 18 25 N | 076 38 04 W |
| Saint Matthews Lutheran Church | Church | 171 | Washington | 39 34 52 N | 077 38 50 W |
| Saint Matthews Memorial Church | Church | 21 | Harford | 39 32 37 N | 076 05 35 W |
| Saint Matthews Parish Hall | Church | 56 | Prince George's | 38 53 30 N | 076 53 55 W |
| Saint Matthews Roman Catholic Church | Church | 101 | Baltimore (city) | 39 21 24 N | 076 35 19 W |
| Saint Matthews School | School | 96 | Baltimore (city) | 39 21 21 N | 076 35 19 W |
| Saint Matthews United Church of Christ | Church | 50 | Baltimore (city) | 39 19 38 N | 076 34 45 W |
| Saint Matthews United Methodist Church | Church | 2 | Anne Arundel | 38 50 07 N | 076 30 53 W |
| Saint Matthews United Methodist Church | Church | 5 | Baltimore | 39 14 34 N | 076 30 45 W |
| Saint Matthews United Methodist Church | Church | 46 | Baltimore (city) | 39 18 56 N | 076 36 38 W |
| Saint Matthews United Methodist Church | Church | 21 | Baltimore (city) | 39 17 56 N | 076 34 17 W |
| Saint Matthews United Methodist Church | Church | 38 | Prince George's | 38 58 37 N | 076 44 45 W |
| Saint Matthews United Methodist Church | Church | 184 | Washington | 39 38 48 N | 077 43 39 W |
| Saint Matthews United Presbyterian Church | Church | 135 | Montgomery | 39 05 37 N | 077 04 43 W |
| Saint Matthias Catholic Church | Church | 51 | Prince George's | 38 57 51 N | 076 50 27 W |
| Saint Matthias Episcopal Church | Church | 67 | Baltimore (city) | 39 21 09 N | 076 32 01 W |
| Saint Matthias School | School | 42 | Prince George's | 38 57 46 N | 076 50 22 W |
| Saint Michael Catholic Church | Church | 629 | Allegany | 39 39 25 N | 078 55 39 W |
| Saint Michael Cemetery | Cemetery | 25 | St. Mary's | 38 07 19 N | 076 22 06 W |
| Saint Michael Church | Church | 62 | Prince George's | 38 39 39 N | 076 46 04 W |
| Saint Michael Church | Church | 25 | St. Mary's | 38 07 17 N | 076 22 01 W |
| Saint Michael Church of God in Christ | Church | 3 | Talbot | 38 47 03 N | 076 13 04 W |
| Saint Michaels | Populated Place | 3 | Talbot | 38 47 06 N | 076 13 28 W |
| Saint Michaels Catholic Church | Church | 238 | Howard | 39 20 17 N | 077 06 25 W |
| Saint Michaels Catholic Church | Church | 177 | Washington | 39 39 16 N | 077 55 54 W |
| Saint Michaels Church | Church | 73 | Baltimore | 39 24 34 N | 076 27 47 W |
| Saint Michaels Church | Church | 50 | Prince George's | 38 59 58 N | 076 58 57 W |
| Saint Michaels Church | Church | 5 | Somerset | 38 11 33 N | 075 41 34 W |
| Saint Michaels Church | Church | 3 | Talbot | 38 47 01 N | 076 13 19 W |
| Saint Michaels Elementary School | School | 3 | Talbot | 38 46 48 N | 076 13 07 W |
| Saint Michaels Fire Department Station 40 | Building | | Talbot | 39 18 08 N | 076 22 05 W |
| Saint Michaels High School | School | 3 | Talbot | 38 46 49 N | 076 12 60 W |
| Saint Michaels Historic District | Park | 3 | Talbot | 38 47 05 N | 076 13 28 W |
| Saint Michaels Manor | Locale | 2 | St. Mary's | 38 04 27 N | 076 20 17 W |
| Saint Michaels Middle School | School | 3 | Talbot | 38 46 47 N | 076 13 06 W |
| Saint Michaels Post Office | Post Office | 3 | Talbot | 38 47 05 N | 076 13 27 W |
| Saint Michaels Roman Catholic Church | Church | 58 | Baltimore | 39 21 28 N | 076 31 37 W |
| Saint Michaels Roman Catholic Church | Church | 26 | Baltimore (city) | 39 17 27 N | 076 35 25 W |
| Saint Michaels School | School | 628 | Allegany | 39 39 24 N | 078 55 38 W |
| Saint Michaels School | School | 24 | Baltimore (city) | 39 17 27 N | 076 35 27 W |
| Saint Michaels School | School | 104 | Montgomery | 38 59 46 N | 077 01 21 W |
| Saint Michaels Town Hall | Building | 3 | Talbot | 38 47 13 N | 076 13 28 W |
| Saint Michaels Ukrainian Orthodox Church | Church | 15 | Baltimore (city) | 39 17 15 N | 076 35 19 W |
| Saint Michaels Village Shopping Center | Locale | 3 | Talbot | 38 46 30 N | 076 12 49 W |
| Saint Mildreds Roman Catholic Church | Church | 7 | Baltimore | 39 16 48 N | 076 29 29 W |
| Saint Nicholas Catholic Church | Church | 73 | Prince George's | 39 04 22 N | 076 51 35 W |
| Saint Nicholas Church | Church | 19 | St. Mary's | 38 16 28 N | 076 26 27 W |
| Saint Nicholas Creek | Stream | | St. Mary's | 38 15 32 N | 076 42 02 W |
| Saint Nicholas Greek Orthodox Church | Church | 29 | Baltimore (city) | 39 17 10 N | 076 33 19 W |
| Saint Omer Branch | Stream | | Harford | 39 36 51 N | 076 19 12 W |
| Saint Patrick Church | Church | 165 | Allegany | 39 37 47 N | 078 23 25 W |
| Saint Patrick Creek | Stream | | St. Mary's | 38 13 57 N | 076 44 26 W |
| Saint Patricks Catholic Church | Church | 19 | Harford | 39 32 52 N | 076 05 37 W |
| Saint Patricks Catholic Church | Church | 152 | Montgomery | 39 06 31 N | 077 04 50 W |
| Saint Patricks Cemetery | Cemetery | 170 | Allegany | 39 37 48 N | 078 23 27 W |
| Saint Patricks Cemetery | Cemetery | 213 | Garrett | 39 39 43 N | 078 46 04 W |
| Saint Patricks Cemetery | Cemetery | 89 | Montgomery | 39 01 31 N | 077 04 51 W |
| Saint Patricks Church | Church | 119 | Cecil | 39 42 57 N | 076 12 07 W |
| Saint Patricks Roman Catholic Church | Church | 193 | Allegany | 39 39 20 N | 078 45 51 W |
| Saint Patricks Roman Catholic Church | Church | 8 | Baltimore (city) | 39 17 12 N | 076 35 36 W |
| Saint Patricks School | School | 2 | Baltimore (city) | 39 17 13 N | 076 36 36 W |
| Saint Patricks School | School | 19 | Harford | 39 32 52 N | 076 05 38 W |
| Saint Paul African Methodist Episcopal Church | Church | 1 | Somerset | 37 58 50 N | 075 51 18 W |
| Saint Paul African Methodist Episcopal Zion Church | Church | 6 | Wicomico | 38 22 16 N | 075 36 28 W |
| Saint Paul Baptist Church | Church | 45 | Baltimore (city) | 39 18 56 N | 076 36 39 W |