Data Last Updated: January 1, 2025

Saint Marys County, MD ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Saint Marys, MD.	28 ZIP Codes (24 General, 3 PO Box, 0 Unique, & 1 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Saint Marys, MD. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	227, 240, 301, 324, 369
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Eastern
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Saint Marys, MD from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	113,777 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	24037
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	Lexington Park, MD
Land Area: The approximate amount of land area covered by Saint Marys, MD in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	359 square miles
Water Area: The approximate amount of water area covered by Saint Marys, MD in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	406 square miles
Coordinates: The latitude/longitude centroid coordinates for Saint Marys County, MD.	-76.605848, 38.302397
Quick Link: Copy the direct link to the Saint Marys, MDCounty page and use anywhere you like!	https://www.zip-codes.com/county/md-saint-marys.asp

Saint Marys, MD ZIP Code Boundaries

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Saint Marys County, MD Covers 28 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 20606	General	Abell	251	0.22%
ZIP Code 20609	General	Avenue	1,076	0.95%
ZIP Code 20618	General	Bushwood	1,073	0.94%
ZIP Code 20619	General	California	14,179	12.46%
ZIP Code 20620	General	Callaway	1,588	1.40%
ZIP Code 20621	General	Chaptico	1,214	1.07%
ZIP Code 20622 *	General	Charlotte Hall	4,741	--
ZIP Code 20624	General	Clements	1,138	1.00%
ZIP Code 20626	General	Coltons Point	403	0.35%
ZIP Code 20627	P.O. Box	Compton	0	0.00%
ZIP Code 20628	General	Dameron	599	0.53%
ZIP Code 20630	General	Drayden	586	0.52%
ZIP Code 20634	General	Great Mills	6,984	6.14%
ZIP Code 20636	General	Hollywood	10,615	9.33%
ZIP Code 20650	General	Leonardtown	15,298	13.45%
ZIP Code 20653	General	Lexington Park	25,180	22.13%
ZIP Code 20656	General	Loveville	106	0.09%
ZIP Code 20659	General	Mechanicsville	24,427	21.47%
ZIP Code 20660	P.O. Box	Morganza	107	0.09%
ZIP Code 20667	General	Park Hall	471	0.41%
ZIP Code 20670	General	Patuxent River	1,226	1.08%
ZIP Code 20674	General	Piney Point	718	0.63%
ZIP Code 20680	General	Ridge	944	0.83%
ZIP Code 20684	General	Saint Inigoes	1,193	1.05%
ZIP Code 20686	P.O. Box	Saint Marys City	977	0.86%
ZIP Code 20687	General	Scotland	304	0.27%
ZIP Code 20690	General	Tall Timbers	954	0.84%
ZIP Code 20692	General	Valley Lee	738	0.65%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Saint Marys, MD, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Saint Marys, MD Information

Saint Marys County, MD Covers 28 ZIP Codes. This includes 24 General ZIP Codes, 3 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There is also 1 Multi County ZIP Code in this area. This record is assigned to a different county, but it does partially cover area in Saint Marys County.

The population for Saint Marys County is 113,777, according to the U.S. Census. Population Density is 316.93 persons per square mile. With 45,560 Housing Units, the Average Household Size is 2.66 persons. There are 41,845 Family Households with an Average Family Size of 2.91 persons. 3.78% of the population is without Health Insurance. The 64.29% Employment Rate is 4.49% above the national average of 59.8%.75,240 people aged 25+ have some educational achievement, with 33.03% (or 24,854 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

There are 5 area codes serving this area including227, 240, 301, 324 and 369. Saint Marys is also located in the Eastern timezone and the current local time is shown above.

Saint Marys is part of the Lexington Park, MD Core Based Statistical Area (CBSA). Its CBSA Code is 30500.It is classified as a metro area, which means the combined population is 50,000 or more (at its core).

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more (for a micro area) and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Saint Marys, MD have 42,565 Residential mailboxes and 1,783 Business mailboxes.There are 1,965 businesses with a total of 30,500 employees. That is an average of 15.5 employees per business. Annual payroll for these businesses is $1,960,359,000. Other Demographics

Saint Marys County Demographic Profile

Population & People

Total Population

113,777

Income

Median Household Income

$102,859

Housing

Total Housing Units

45,560

Health

Without Healthcare Coverage

3.78%

Business & Economy

Total Businesses

1,965

Families

Total Households

41,845

Employment

Employment Rate

64.29%

Education

Bachelor's Degree or Higher

33.03%

Total Population: Total number of people from the 2020 U.S. Census for Saint Marys, MD. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	113,777
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Saint Marys, MD. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	113,402
Total Households: Total number of Households from the 2020 U.S. Census for Saint Marys, MD. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	41,845
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	45,560
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.66
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.91

Other Saint Marys Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	42,565
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	1,783
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	64,275
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	28,469
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	2,113

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	1,965
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$458,449,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$1,960,359,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	30,500

Sum of all ZIP Codes assigned Saint Marys, MD as their primary County.

References

U.S. Postal Service [Last Updated: 1/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 1/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov