Great Mills, MD ZIP code
The ZIP code for Great Mills, Maryland is 20634. It is in St. Mary's County.
- Population in these ZIPs
- 7,088
- Avg. median income
- $139,400population-weighted
- Typical home value
- $368,300population-weighted
- Metro area
- Lexington Park, MD
Loading map…
Click anywhere on the map to see which ZIP code it's in.
Great Mills, MD ZIP code list
| ZIP code | Population | Median income | Typical home value |
|---|---|---|---|
| 20634 | 7,088 | $139,375 | $368,300 |
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 near Great Mills
- Callaway 1 mi
- Park Hall 3 mi
- Lexington Park 4 mi
- California 4 mi
- Valley Lee 4 mi
- Saint Marys City 5 mi
- Patuxent River 6 mi
- Drayden 6 mi
- Tall Timbers 6 mi
- Solomons 6 mi
- Piney Point 7 mi
- Leonardtown 7 mi
Frequently asked questions
What is the ZIP code for Great Mills, MD?
The ZIP code for Great Mills, MD is 20634.
What county is Great Mills, Maryland in?
Great Mills ZIP codes are in St. Mary's County.