Explore the most up-to-date St. Mary’s County zip code map, highlighting neighborhoods, boundaries, and key locations. With a total of 27 zip codes, St. Mary’s County is home to 113,814 residents. The county has a median home value of $376,900 and a median household income of $113,668. Below, you’ll find additional key statistics that offer a snapshot of the area.
There are a total of 27 zip codes in St. Mary’s County. Use the interactive map above to view the boundaries for each one.
Complete list of ZIP codes in the area: 20606, 20609, 20618, 20619, 20620, 20621, 20622, 20624, 20626, 20628, 20630, 20634, 20636, 20650, 20653, 20656, 20659, 20660, 20667, 20670, 20674, 20680, 20684, 20686, 20687, 20690, 20692.