St. Mary's County, MD ZIP Codes
27 ZIP codes cover all or part of St. Mary's County, Maryland. The Census Bureau counts 115,126 residents in the county, with a median household income of $119,446 and a median home value of $407,600. Median household income ranges from $70,371 in 20670 to $165,972 in 20620. Its largest communities include Lexington Park, California, Wildewood, Leonardtown and Golden Beach.
St. Mary's County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 115,126 |
| Households | 42,436 |
| Median household income | $119,446 |
| Median home value | $407,600 |
| Median age | 37.2 |
| Median rent | $1,747 |
All 27 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 118,665 |
| Households (sum of ZIP codes) | 43,466 |
| Median household income, range across ZIP codes | $70,371 (20670) to $165,972 (20620) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $123,619 |
| Homeowners | 73.6% |
| Households with kids under 18 | 36.1% |
| Moved in the past year | 12.2% |
| Carrier routes in EDDM2GO's route library | 85 routes, 44,666 homes (25 of 27 ZIP codes) |
Top facts
- Highest median household income in St. Mary's County: 20620 ($165,972)
- Most residents: 20653 (26,852 people)
- Highest homeownership: 20620 (96.4% own their home)
- Most households with kids: 20670 (95.2% of households)
- Most new movers: 20670 (24.7% moved in last year)
- Youngest median age: 20670 (22.9 years)
- Highest median home value: 20650 ($481,700)
Every ZIP code in St. Mary's County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 20653 | Lexington Park | 26,852 | 11,028 | $103,048 | $353,300 | 57.4% | 31.9% | 13.9% | 14 | 10,765 | 100% of its land |
| 20659 | Mechanicsville | 24,324 | 8,300 | $121,654 | $416,900 | 88.6% | 40.9% | 6.5% | 15 | 8,709 | 96% of its land |
| 20650 | Leonardtown | 16,094 | 5,642 | $143,116 | $481,700 | 78.7% | 39.1% | 12.4% | 10 | 5,932 | 100% of its land |
| 20619 | California | 14,212 | 5,719 | $119,432 | $376,800 | 64.5% | 36.0% | 20.6% | 9 | 6,800 | 100% of its land |
| 20636 | Hollywood | 10,486 | 3,324 | $163,690 | $474,000 | 87.8% | 36.9% | 8.6% | 7 | 4,237 | 100% of its land |
| 20634 | Great Mills | 7,088 | 2,694 | $139,375 | $342,300 | 65.4% | 33.8% | 18.7% | 6 | 2,864 | 100% of its land |
| 20622 | Charlotte Hall | 5,185 | 1,489 | $124,063 | $438,900 | 95.1% | 43.3% | 5.1% | 3 | 1,743 | 17% of its land |
| 20670 | Patuxent River | 2,046 | 439 | $70,371 | — | 0.0% | 95.2% | 24.7% | 2 | 654 | 100% of its land |
| 20618 | Bushwood | 1,705 | 656 | $105,508 | $355,000 | 83.4% | 28.0% | 11.1% | 1 | 321 | 100% of its land |
| 20620 | Callaway | 1,115 | 389 | $165,972 | $391,300 | 96.4% | 13.6% | 6.1% | 1 | 527 | 100% of its land |
| 20690 | Tall Timbers | 1,077 | 478 | $122,750 | $379,700 | 75.3% | 39.1% | 2.2% | 1 | 363 | 100% of its land |
| 20686 | Saint Marys City | 971 | 0 | — | — | — | — | 29.2% | — | — | 100% of its land |
| 20621 | Chaptico | 958 | 534 | — | $481,100 | 100.0% | 20.4% | 2.4% | 1 | 369 | 100% of its land |
| 20684 | Saint Inigoes | 802 | 357 | $180,060 | $360,500 | 93.0% | 27.7% | 4.4% | 2 | 449 | 100% of its land |
| 20624 | Clements | 796 | 296 | $104,545 | $430,600 | 87.5% | 38.2% | 1.4% | 2 | 320 | 100% of its land |
| 20674 | Piney Point | 769 | 291 | $171,985 | $592,400 | 87.6% | 28.5% | 13.7% | 1 | 343 | 100% of its land |
| 20609 | Avenue | 714 | 341 | $118,102 | $568,400 | 88.9% | 12.3% | 0.0% | 1 | 460 | 100% of its land |
| 20680 | Ridge | 663 | 288 | — | $397,500 | 39.9% | 55.9% | 41.0% | 1 | 402 | 100% of its land |
| 20630 | Drayden | 559 | 253 | $233,411 | $618,100 | 75.1% | 19.0% | 12.2% | 1 | 243 | 100% of its land |
| 20692 | Valley Lee | 505 | 194 | $201,250 | $468,000 | 100.0% | 27.3% | 1.8% | 1 | 260 | 100% of its land |
| 20628 | Dameron | 503 | 199 | — | $545,800 | 82.9% | 29.6% | 9.9% | 1 | 189 | 100% of its land |
| 20687 | Scotland | 415 | 183 | — | $458,100 | 91.3% | 13.7% | 0.0% | 1 | 173 | 100% of its land |
| 20606 | St. Mary's County | 291 | 131 | $88,262 | $451,000 | 84.7% | 11.5% | 4.8% | 1 | 157 | 100% of its land |
| 20626 | Coltons Point | 284 | 146 | — | — | 83.6% | 10.3% | 0.0% | 1 | 152 | 100% of its land |
| 20667 | St. Mary's County | 150 | 45 | — | — | 100.0% | 100.0% | 33.1% | 1 | 190 | 100% of its land |
| 20656 | Loveville | 87 | 36 | — | — | 25.0% | 25.0% | 0.0% | 1 | 30 | 100% of its land |
| 20660 | Morganza | 14 | 14 | — | — | 100.0% | 0.0% | 0.0% | — | — | 100% of its land |
A ZIP code is listed for St. Mary's County when at least 10% of its land is in the county, when it holds at least 10% of the county's land, or when the county is its main county. Totals add up whole ZIP codes, including parts that cross the county line; the Census county figures above do not.
Cities and communities
- Lexington Park — 13,252 residents · 1 ZIP code
- California — 13,136 residents · 3 ZIP codes
- Wildewood — 7,552 residents · 1 ZIP code
- Leonardtown — 4,808 residents · 1 ZIP code
- Golden Beach — 3,830 residents · 1 ZIP code
- Mechanicsville — 1,395 residents · 1 ZIP code
- Piney Point — 1,274 residents · 2 ZIP codes
- Charlotte Hall — 1,172 residents · 2 ZIP codes
- Callaway — 930 residents · 2 ZIP codes
- Tall Timbers — 391 residents · 2 ZIP codes
- St. George Island — 277 residents · 1 ZIP code
Rankings
- Richest ZIP codes in St. Mary's County — 11 ZIP codes ranked
- ZIP codes with the highest home values in St. Mary's County — 10 ZIP codes ranked
- ZIP codes with the highest homeownership in St. Mary's County — 11 ZIP codes ranked
- ZIP codes with the most families with kids in St. Mary's County — 11 ZIP codes ranked
- ZIP codes with the most new movers in St. Mary's County — 11 ZIP codes ranked
- Youngest ZIP codes in St. Mary's County — 11 ZIP codes ranked
- Oldest ZIP codes in St. Mary's County — 11 ZIP codes ranked
- Fastest-growing ZIP codes in St. Mary's County — 9 ZIP codes ranked
Price a mailing to St. Mary's County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in St. Mary's County, MD?
- 20653, 20659, 20650, 20619, 20636, 20634, 20622, 20670, 20618, 20620, 20690, 20686, 20621, 20684, 20624, 20674, 20609, 20680, 20630, 20692, 20628, 20687, 20606, 20626, 20667, 20656 and 20660. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of St. Mary's County?
- 115,126 residents in 42,436 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in St. Mary's County?
- $119,446 for the county as a whole. Its ZIP codes range from $70,371 (20670) to $165,972 (20620).
- Which St. Mary's County ZIP code has the highest median household income?
- 20620, at $165,972, among ZIP codes with at least 1,000 residents. See the full ranking of St. Mary's County ZIP codes by income.
- How many carrier routes and mailboxes are in St. Mary's County?
- For the 25 of 27 ZIP codes in EDDM2GO's stored route library: 85 carrier routes reaching 44,666 residential and 1,983 business mailboxes. The route map loads the rest when you search them.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.