St. Martin's is located on the corner of Route 355 and Summit Avenue at the south gateway to Olde Towne Gaithersburg. 201 S. Frederick Avenue, Gaithersburg, MD 20877-2393.
| Parish Office: | 301-990-3203, Fax 301-990-7538 |
| Religious Education Office: | 301-990-2556 |
| Youth Ministry: | 301-990-8303 |
| Social Concerns Ministry: St. Martin's School: |
301-990-7373 301-990-2441 |