Data Last Updated: July 1, 2025

Frederick County, MD ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Frederick, MD.	39 ZIP Codes (23 General, 7 PO Box, 1 Unique, & 8 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Frederick, 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 Frederick, 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.	271,717 [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.	24021
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.	Washington-Arlington-Alexandria, DC-VA-MD-WV
Land Area: The approximate amount of land area covered by Frederick, 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.	661 square miles
Water Area: The approximate amount of water area covered by Frederick, 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.	7 square miles
Coordinates: The latitude/longitude centroid coordinates for Frederick County, MD.	-77.398004, 39.472232
Quick Link: Copy the direct link to the Frederick, MDCounty page and use anywhere you like!	https://www.zip-codes.com/county/md-frederick.asp

Frederick, MD ZIP Code Boundaries

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Frederick County, MD Covers 39 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 20842 *	General	Dickerson	2,021	--
ZIP Code 20871 *	General	Clarksburg	28,557	--
ZIP Code 21701	General	Frederick	39,629	14.58%
ZIP Code 21702	General	Frederick	46,412	17.08%
ZIP Code 21703	General	Frederick	41,138	15.14%
ZIP Code 21704	General	Frederick	19,275	7.09%
ZIP Code 21705	P.O. Box	Frederick	9	0.00%
ZIP Code 21709	Unique	Frederick	0	0.00%
ZIP Code 21710	General	Adamstown	4,769	1.76%
ZIP Code 21714	P.O. Box	Braddock Heights	358	0.13%
ZIP Code 21716	General	Brunswick	6,753	2.49%
ZIP Code 21717	P.O. Box	Buckeystown	199	0.07%
ZIP Code 21718	General	Burkittsville	134	0.05%
ZIP Code 21719 *	General	Cascade	1,230	--
ZIP Code 21727	General	Emmitsburg	6,593	2.43%
ZIP Code 21754	General	Ijamsville	7,115	2.62%
ZIP Code 21755	General	Jefferson	5,627	2.07%
ZIP Code 21757 *	General	Keymar	2,870	--
ZIP Code 21758	General	Knoxville	4,809	1.77%
ZIP Code 21759	P.O. Box	Ladiesburg	0	0.00%
ZIP Code 21762	P.O. Box	Libertytown	233	0.09%
ZIP Code 21769	General	Middletown	11,759	4.33%
ZIP Code 21770	General	Monrovia	7,575	2.79%
ZIP Code 21771	General	Mount Airy	30,697	11.30%
ZIP Code 21773	General	Myersville	5,410	1.99%
ZIP Code 21774	General	New Market	15,496	5.70%
ZIP Code 21775	P.O. Box	New Midway	0	0.00%
ZIP Code 21776 *	General	New Windsor	5,726	--
ZIP Code 21777	General	Point Of Rocks	1,890	0.70%
ZIP Code 21778	General	Rocky Ridge	1,145	0.42%
ZIP Code 21780	General	Sabillasville	1,688	0.62%
ZIP Code 21783 *	General	Smithsburg	9,306	--
ZIP Code 21787 *	General	Taneytown	11,066	--
ZIP Code 21788	General	Thurmont	11,491	4.23%
ZIP Code 21790	General	Tuscarora	93	0.03%
ZIP Code 21791 *	General	Union Bridge	5,292	--
ZIP Code 21792	P.O. Box	Unionville	0	0.00%
ZIP Code 21793	General	Walkersville	10,447	3.84%
ZIP Code 21798	General	Woodsboro	2,366	0.87%

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

Important Frederick, MD Information

Frederick County, MD Covers 39 ZIP Codes. This includes 23 General ZIP Codes, 7 PO Box ZIP Codes, and 1 Unique (reserved for Business and Volume Mail Receivers). There are also 8 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Frederick County.

The population for Frederick County is 271,717, according to the U.S. Census. Population Density is 411.07 persons per square mile. With 103,493 Housing Units, the Average Household Size is 2.71 persons. There are 98,358 Family Households with an Average Family Size of 2.84 persons. 4.07% of the population is without Health Insurance. The 67.22% Employment Rate is 7.42% above the national average of 59.8%.191,495 people aged 25+ have some educational achievement, with 44.88% (or 85,948 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. Frederick is also located in the Eastern timezone and the current local time is shown above.

Frederick is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Core Based Statistical Area (CBSA). Its CBSA Code is 47900.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 Frederick, MD have 113,975 Residential mailboxes and 6,265 Business mailboxes.There are 6,877 businesses with a total of 97,882 employees. That is an average of 14.2 employees per business. Annual payroll for these businesses is $5,528,452,000. Other Demographics

Frederick County Demographic Profile

Population & People

Total Population

271,717

Income

Median Household Income

$120,458

Housing

Total Housing Units

103,493

Health

Without Healthcare Coverage

4.07%

Business & Economy

Total Businesses

6,877

Families

Total Households

98,358

Employment

Employment Rate

67.22%

Education

Bachelor's Degree or Higher

44.88%

Total Population: Total number of people from the 2020 U.S. Census for Frederick, 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.	271,717
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Frederick, 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.	309,785
Total Households: Total number of Households from the 2020 U.S. Census for Frederick, MD. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	98,358
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.	103,493
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.	2.71
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.	2.84

Other Frederick Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	113,975
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	6,265
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.	164,957
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	62,626
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	10,721

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	6,877
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$1,326,546,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$5,528,452,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	97,882

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

References

U.S. Postal Service [Last Updated: 7/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 7/1/2025], 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