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County ZIP codes · Maryland · FIPS 24037

St. Mary's County, MD ZIP Codes

St. Mary's County, Maryland has 29 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 27 residential and 2 for PO boxes or a single organization. 26 of the residential ones lie mainly in St. Mary's County and 1 mainly in a neighboring county; 2 cross the county line. Median household income ranges from $70,371 in 20670 (Patuxent River) to $165,972 in 20620 (Callaway) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of St. Mary's County?

20606 · Abell: $88k20609 · Avenue: $118k20618 · Bushwood: $106k20619 · California: $119k20620 · Callaway: $166k20621 · Chaptico: –20622 · Charlotte Hall: $124k20624 · Clements: $105k20626 · Coltons Point: –20628 · Dameron: –20630 · Drayden: $233k20634 · Great Mills: $139k20636 · Hollywood: $164k20650 · Leonardtown: $143k20653 · Lexington Park: $103k20656 · Loveville: –20659 · Mechanicsville: $122k20660 · Morganza: –20667 · Park Hall: –20670 · Patuxent River: $70k20674 · Piney Point: $172k20680 · Ridge: –20684 · Saint Inigoes: $180k20686 · Saint Marys City: –20687 · Scotland: –20690 · Tall Timbers: $123k20692 · Valley Lee: $201k2065920650206222063620653206192063020621206242060920634206802067020684206922067420628206872062020690206672062620606 · Abell: $88k20609 · Avenue: $118k20618 · Bushwood: $106k20619 · California: $119k20620 · Callaway: $166k20621 · Chaptico: –20622 · Charlotte Hall: $124k20624 · Clements: $105k20626 · Coltons Point: –20628 · Dameron: –20630 · Drayden: $233k20634 · Great Mills: $139k20636 · Hollywood: $164k20650 · Leonardtown: $143k20653 · Lexington Park: $103k20656 · Loveville: –20659 · Mechanicsville: $122k20660 · Morganza: –20667 · Park Hall: –20670 · Patuxent River: $70k20674 · Piney Point: $172k20680 · Ridge: –20684 · Saint Inigoes: $180k20686 · Saint Marys City: –20687 · Scotland: –20690 · Tall Timbers: $123k20692 · Valley Lee: $201k20659206502062220636206532061920630206212062420609206342068020670206842067420628206672062620606 · Abell: $88k20609 · Avenue: $118k20618 · Bushwood: $106k20619 · California: $119k20620 · Callaway: $166k20621 · Chaptico: –20622 · Charlotte Hall: $124k20624 · Clements: $105k20626 · Coltons Point: –20628 · Dameron: –20630 · Drayden: $233k20634 · Great Mills: $139k20636 · Hollywood: $164k20650 · Leonardtown: $143k20653 · Lexington Park: $103k20656 · Loveville: –20659 · Mechanicsville: $122k20660 · Morganza: –20667 · Park Hall: –20670 · Patuxent River: $70k20674 · Piney Point: $172k20680 · Ridge: –20684 · Saint Inigoes: $180k20686 · Saint Marys City: –20687 · Scotland: –20690 · Tall Timbers: $123k20692 · Valley Lee: $201k206592065020622206362065320619206212060920670
The residential ZIP codes of St. Mary's County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $103,048 and $143,116.

They carry 27 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 27 residential ZIP codes in St. Mary's County

26 ZIP codes lie mainly in St. Mary's County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in St. Mary's County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
20653 Lexington Park 26,852 809 $103k $353k 100%
20659 Mechanicsville 24,324 251 $122k $417k 96%
20650 Leonardtown 16,094 262 $143k $482k 100%
20619 California 14,212 885 $119k $377k 100%
20636 Hollywood 10,486 305 $164k $474k 100%
20634 Great Mills 7,088 1,014 $139k $342k 100%
20670 Patuxent River 2,046 219 $70k – 100%
20618 Bushwood 1,705 225 $106k $355k 100%
20620 Callaway 1,115 260 $166k $391k 100%
20690 Tall Timbers 1,077 654 $123k $380k 100%
20686 Saint Marys City 971 3,583 – – 100%
20621 Chaptico 958 69 – $481k 100%
20684 Saint Inigoes 802 96 $180k $361k 100%
20624 Clements 796 77 $105k $431k 100%
20674 Piney Point 769 421 $172k $592k 100%
20609 Avenue 714 71 $118k $568k 100%
20680 Ridge 663 84 – $398k 100%
20630 Drayden 559 81 $233k $618k 100%
20692 Valley Lee 505 70 $201k $468k 100%
20628 Dameron 503 78 – $546k 100%
20687 Scotland 415 83 – $458k 100%
20606 Abell 291 320 $88k $451k 100%
20626 Coltons Point 284 186 – – 100%
20667 Park Hall 150 63 – – 100%
20656 Loveville 87 151 – – 100%
20660 Morganza 14 15 – – 100%

Partly in St. Mary's County

Residential ZIP codes mainly in another county that reach at least 1% into St. Mary's County, by their share here
In this county
20622 Charlotte Hall 5,185 142 $124k $439k 17%

Download the 29 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

2 ZIP codes of St. Mary's County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in St. Mary's County and in the neighboring counties
ZIPIn St. Mary'sElsewhere
2065996%Charles County 4%
2062217%Charles County 83%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in St. Mary's County without a residential area (GeoNames postal codes)
ZIPPostal name
20627Compton
20635Helen

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do St. Mary's County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of St. Mary's County starts with 206.

Three-digit prefixes of St. Mary's County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are St. Mary's County's
PrefixSectional centerHereAll codes
206 Southern, MD (SCF 207) 29 68

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.