St. Mary's County, Maryland ZIP codes
28 ZIP codes are in St. Mary's County, plus 1 that cross in from neighboring counties. It's part of the Lexington Park, MD metro area.
- ZIP codes
- 28
- Population in these ZIPs
- 113,480
- Avg. median income
- $125,900population-weighted
- Cities & towns
- 28
Click anywhere on the map to see which ZIP code it's in.
ZIP codes in St. Mary's County
| ZIP code | City | Population | Median income | Typical home value |
|---|---|---|---|---|
| 20606 | Abell | 291 | $88,262 | $458,500 |
| 20609 | Avenue | 714 | $118,102 | $434,300 |
| 20618 | Bushwood | 1,705 | $105,508 | $345,500 |
| 20619 | California | 14,212 | $119,432 | $395,700 |
| 20620 | Callaway | 1,115 | $165,972 | $434,300 |
| 20621 | Chaptico | 958 | — | $374,500 |
| 20624 | Clements | 796 | $104,545 | $485,800 |
| 20626 | Coltons Point | 284 | — | $422,100 |
| 20627 PO Box | Compton | — | — | — |
| 20628 | Dameron | 503 | — | $497,700 |
| 20630 | Drayden | 559 | $233,411 | $636,100 |
| 20634 | Great Mills | 7,088 | $139,375 | $368,300 |
| 20635 PO Box | Helen | — | — | — |
| 20636 | Hollywood | 10,486 | $163,690 | $512,800 |
| 20650 | Leonardtown | 16,094 | $143,116 | $528,300 |
| 20653 | Lexington Park | 26,852 | $103,048 | $386,600 |
| 20656 | Loveville | 87 | — | — |
| 20659 | Mechanicsville | 24,324 | $121,654 | $439,100 |
| 20660 | Morganza | 14 | — | — |
| 20667 | Park Hall | 150 | — | $395,400 |
| 20670 | Patuxent River | 2,046 | $70,371 | — |
| 20674 | Piney Point | 769 | $171,985 | $478,200 |
| 20680 | Ridge | 663 | — | $437,900 |
| 20684 | Saint Inigoes | 802 | $180,060 | $466,600 |
| 20686 | Saint Marys City | 971 | — | — |
| 20687 | Scotland | 415 | — | $353,400 |
| 20690 | Tall Timbers | 1,077 | $122,750 | $521,900 |
| 20692 | Valley Lee | 505 | $201,250 | $478,100 |
ZIP codes partly in St. Mary's County
These ZIP codes are mostly in a neighboring county but cover part of St. Mary's County.
| ZIP code | City | County | Population | Median income | Typical home value |
|---|---|---|---|---|---|
| 20622 | Charlotte Hall | Charles County | 5,185 | $124,063 | $500,900 |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities and towns in St. Mary's County
Nearby counties
Frequently asked questions
How many ZIP codes are in St. Mary's County, Maryland?
28 ZIP codes are mainly in St. Mary's County, and 1 more ZIP codes from neighboring areas reach partly into it.
What cities are in St. Mary's County?
ZIP codes in St. Mary's County use the city names Abell, Avenue, Bushwood, California, Callaway, Chaptico, Clements, Coltons Point, Compton, Dameron, Drayden and Great Mills and others.
What metro area is St. Mary's County in?
St. Mary's County is part of the Lexington Park, MD metropolitan statistical area.