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ZIP Code Database - Facts & Stats
Data Last Updated: December 1, 2024

MONTGOMERY County, MD ZIP Codes



MONTGOMERY County, MD Covers 81 ZIP Codes

ZIP CodeClassificationCityPopulationArea Code(s)
ZIP Code 20705 *GeneralBeltsville29,456227/240/301/324/369/410
ZIP Code 20707 *GeneralLaurel37,702227/240/301/324/369/410/443/667
ZIP Code 20777 *GeneralHighland3,527227/240
ZIP Code 20783 *GeneralHyattsville48,946227/301/324/369
ZIP Code 20810UniqueBethesda0227/240/301/324/369
ZIP Code 20811UniqueBethesda0227/240/301/324/369
ZIP Code 20812GeneralGlen Echo287227/240/301/324/369
ZIP Code 20813P.O. BoxBethesda0227/240/301/324/369
ZIP Code 20814GeneralBethesda31,919227/240/301/324/369
ZIP Code 20815GeneralChevy Chase31,517227/240/301/324/369
ZIP Code 20816GeneralBethesda17,035227/240/301/324/369
ZIP Code 20817GeneralBethesda38,908227/240/301/324/369
ZIP Code 20818GeneralCabin John1,832227/240/301/324/369
ZIP Code 20824P.O. BoxBethesda0227/240/301/324/369
ZIP Code 20825P.O. BoxChevy Chase0227/240/301/324/369
ZIP Code 20827P.O. BoxBethesda0227/240/301/324/369
ZIP Code 20830P.O. BoxOlney0227/240/301/324/369
ZIP Code 20832GeneralOlney25,969227/240/301/324/369
ZIP Code 20833GeneralBrookeville7,913227/240/301/324/369
ZIP Code 20837GeneralPoolesville6,634227/240/301/324/369
ZIP Code 20838GeneralBarnesville218227/240/301/324/369
ZIP Code 20839GeneralBealsville176227/240/301/324/369
ZIP Code 20841GeneralBoyds9,538227/240/301/324/369
ZIP Code 20842GeneralDickerson2,021227/240/301/324/369
ZIP Code 20847P.O. BoxRockville0227/240/301/324/369
ZIP Code 20848P.O. BoxRockville0227/240/301/324/369
ZIP Code 20849P.O. BoxRockville0227/240/301/324/369
ZIP Code 20850GeneralRockville51,045227/240/301/324/369
ZIP Code 20851GeneralRockville14,327227/240/301/324/369
ZIP Code 20852GeneralRockville48,347227/240/301/324/369
ZIP Code 20853GeneralRockville30,611227/240/301/324/369
ZIP Code 20854GeneralPotomac50,698227/301/324/369
ZIP Code 20855GeneralDerwood17,003227/240/301/324/369
ZIP Code 20857UniqueRockville0227/240/301/324/369
ZIP Code 20859P.O. BoxPotomac0227/301/324/369
ZIP Code 20860GeneralSandy Spring2,079227/240/301/324/369
ZIP Code 20861GeneralAshton3,067227/240/301/324/369
ZIP Code 20862GeneralBrinklow453227/240/301/324/369
ZIP Code 20866GeneralBurtonsville15,199227/301/324/369
ZIP Code 20868GeneralSpencerville671227/301/324/369
ZIP Code 20871GeneralClarksburg28,557227/240/301/324/369
ZIP Code 20872GeneralDamascus13,349227/240/301/324/369
ZIP Code 20874GeneralGermantown62,908227/301/324/369
ZIP Code 20875P.O. BoxGermantown0227/301/324/369
ZIP Code 20876GeneralGermantown26,034227/240/301/324/369
ZIP Code 20877GeneralGaithersburg37,577227/240/301/324/369
ZIP Code 20878GeneralGaithersburg65,990227/301/324/369
ZIP Code 20879GeneralGaithersburg26,176227/240/301/324/369
ZIP Code 20880P.O. BoxWashington Grove504227/240/301/324/369
ZIP Code 20882GeneralGaithersburg13,890227/240/301/324/369
ZIP Code 20883P.O. BoxGaithersburg0227/240/301/324/369
ZIP Code 20884P.O. BoxGaithersburg0227/240/301/324/369
ZIP Code 20885P.O. BoxGaithersburg0227/240/301/324/369
ZIP Code 20886GeneralMontgomery Village35,649227/240/301/324/369
ZIP Code 20889UniqueBethesda1,010227/240/301/324/369
ZIP Code 20891P.O. BoxKensington0227/240/301/324/369
ZIP Code 20892UniqueBethesda2227/240/301/324/369
ZIP Code 20894UniqueBethesda0227/240/301/324/369
ZIP Code 20895GeneralKensington19,753227/240/301/324/369
ZIP Code 20896P.O. BoxGarrett Park1,019227/240/301/324/369
ZIP Code 20898P.O. BoxGaithersburg0227/240/301/324/369
ZIP Code 20899UniqueGaithersburg125227/240/301/324/369
ZIP Code 20901GeneralSilver Spring36,537227/240/301/324/369
ZIP Code 20902GeneralSilver Spring52,533227/240/301/324/369
ZIP Code 20903GeneralSilver Spring24,103227/301/324/369
ZIP Code 20904GeneralSilver Spring59,051227/301/324/369
ZIP Code 20905GeneralSilver Spring17,700227/301/324/369
ZIP Code 20906GeneralSilver Spring71,641227/240/301/324/369
ZIP Code 20907P.O. BoxSilver Spring0227/240/301/324/369
ZIP Code 20908P.O. BoxSilver Spring0227/240/301/324/369
ZIP Code 20910GeneralSilver Spring45,610227/240/301/324/369
ZIP Code 20911P.O. BoxSilver Spring0227/240/301/324/369
ZIP Code 20912GeneralTakoma Park25,463227/240/301/324/369
ZIP Code 20913P.O. BoxTakoma Park0227/240/301/324/369
ZIP Code 20914P.O. BoxSilver Spring0227/301/324/369
ZIP Code 20915P.O. BoxSilver Spring0227/240/301/324/369
ZIP Code 20916P.O. BoxSilver Spring0227/240/301/324/369
ZIP Code 20918P.O. BoxSilver Spring0227/240/301/324/369
ZIP Code 20993UniqueSilver Spring0227/301/324/369
ZIP Code 21771 *GeneralMount Airy30,697227/240/301/324/369
ZIP Code 21797 *GeneralWoodbine8,956443/667/410

* Indicates a Multi County ZIP Code, whose primary County is something other than Montgomery, MD.



Timezone(s): All Time Zones found within this county. In the United States, 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. The alignment between ZIP codes and time zones is not perfect. A single time zone can cover multiple ZIP codes, and, conversely, a single ZIP code could theoretically span across multiple time zones, although this is quite rare.Eastern
 
Population: The total Population for Montgomery County, MD, taken from the 2020 U.S. Census DP1. This population total includes all people residing in and counts them regardless of citizenship or immigration status. Include are U.S. Citizens, permanent residents, temporary migrants, and undocumented workers. The total population represents people who live in the state, not just those present on the day of the census. State Population is critical in determining political representation, funding allocation, planning and policy-making, and demographic analysis. 1,062,061 (More Details)
Male Population: The sum of all males for Montgomery County, MD from the 2020 U.S. Census DP1. Each respondent self-identified their gender on the survey, as they were asked to indicate their gender assigned at birth. The male population information is important for healthcare planning, policy making, social research, and economic planning and development.509,117
Female Population: The sum of all females for Montgomery County, MD from the 2020 U.S. Census DP1. Each respondent self-identified their gender on the survey, as they were asked to indicate their gender assigned at birth. The female population information is important for healthcare planning, policy making, social research, and economic planning and development.552,944
Median Age: The median age of the total population of this county. Median age is not a future prediction, it is the actual number from the 2020 Census. Median age is the middle age of the population. Half the population is older than the average age and half is younger.40
 
ZIP Codes: The total number of ZIP Codes which at least partially fall inside Montgomery County, MD. Did you know that approximately 23% of ZIP Codes cross county lines? Several even cross State lines. ZIP Codes do not follow other geographic boundaries because they were created exclusively for the expedient delivery of mail.77
Cities: The total number of City names which are associated with ZIP Codes that partially or wholly cross into Montgomery County, MD. Alongside the official city name, USPS also recognizes certain alternate names for cities or towns that can be used in mailing addresses. These may include towns, villages, abbreviations, names in other languages, or names that have been commonly used historically.30
Counties: The total number of counties associated with ZIP Codes that are at least partially part of Montgomery County, MD.1
Area Codes: The total number of Area Codes associated with ZIP Codes in Montgomery County, MD. Area codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. Each area code identifies a specific geographic area (usually part of a state or territory) and allows calls to be routed to the correct area. There are approximately 350 area codes in use in the United States.5
 
Total Area: The approximate amount of area covered by Montgomery, MD in square miles. This includes all land and water areas within the legal county boundaries.507 square miles (county)
Land Area: The approximate amount of land area covered by Montgomery, MD in square miles. Land area data provided by the Census Bureau are based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each state. Land area is important in many types of statistical analysis. For example, population density, the number of people per unit of land area, is a commonly used statistic based on this data. Land area measurements are also important for urban planning, environmental studies, and economic analysis. 493 square miles (county)
Water Area: The approximate amount of water area covered by Montgomery, MD in square miles. Calculations for water area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompassed features such as lakes, reservoirs, rivers, and coastal water bodies. Water surface data are especially important for environmental and conservation planning, water resource management, transportation, and recreational planning.14 square miles (county)

MONTGOMERY, MD Demographic Information

* Demographic data is based on 2020 Census.

Total population of MONTGOMERY County, MD: Total Population from the 2020 Census. This reflects the exact population of the geographic 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.1,062,061
Male population of MONTGOMERY County, MD: The Male Population from the 2020 Census. This is not a forecast for the future, but an exact count for this geographic area at the time of the Census. Each respondent self-identified their gender on the survey, as they were asked to indicate their gender assigned at birth. The Male Population information is important for healthcare planning, policy making, social research, and economic planning and development.509,117
Female population of MONTGOMERY County, MD: The Female Population from the 2020 Census. This is not a forecast for the future, but an exact count for this geographic area at the time of the Census. Each respondent self-identified their gender on the survey, as they were asked to indicate their gender assigned at birth. The Female Population information is important for healthcare planning, policy making, social research, and economic planning and development.552,944
Median age (years): The Median Age of the Total Population from the 2020 Census for this geographic area. Median age is not a future prediction, it is the actual calculated age from the 2020 Census. Median age is the middle age of the population. Half the population is older than the average age and half is younger. Median Age can relate how young or old a geographic area is compared to others. If one area is 44 and the other is 40, then the first are is an average of 4 years older.39.5
White Population: The White Population is an exact count from the 2020 Census for this geographic area. The numbers for the White Population are not future projections. On the 2020 U.S. Census questionnaire, people were asked to check all races which applied to them, including White. This count includes all who selected White/Caucasian in their response, even if they selected another race as well.457,783
Black Population: The Black Population is an exact count from the 2020 Census for this geographic area. The numbers for the Black Population are not future projections. On the 2020 U.S. Census questionnaire, people were asked to check all races which applied to them, including Black or African American. This count includes all who selected Black or African American in their response, even if they selected another race as well.197,077
Indian Population: The American Indian and Alaska Native Population is an exact count from the 2020 Census for this geographic area and not estimates for the future. On the 2020 U.S. Census questionnaire, people were asked to check all races which applied to them, including American Indian and Alaska Native. This count includes all who selected American Indian and Alaska Native in their response, even if they selected another race as well.7,036
Asian Population: The Asian Population is an exact count from the 2020 Census for this geographic area, not future projections. On the U.S. Census questionnaire, people were asked to check all races which applied to them, including Chinese, Filipino, Asian Indian, Vietnamese, Korean, Japanese, or Other Asian. This count includes all who selected one of these options in their response, even if they selected another race as well.163,507
Hawaiian Population: The Hawaiian or Pacific Islander Population is an exact count from the 2020 Census for this geographic area and are not future projections. On the 2020 U.S. Census questionnaire, people were asked to check all races which applied to them, including Native Hawaiian and Pacific Islander. This count includes all who selected either Hawaiian or Pacific Islander in their response, even if they selected another race as well.610
Hispanic Population: The Hispanic Population is an exact count from the 2020 Census for this geographic area and is not an estimate or future projection. On the 2020 U.S. Census questionnaire, people were first asked for their Ethnicity, including if they were from Hispanic, Latino, or Spanish Origin, including Mexican, Mexican American, Chicano, Puerto Rican, Cuban, or other ethnic origin. This count includes all who affirmed that they were part of this ethnic origin. Respondents who selected this option were also asked to select a race separately and would be counted once in this number as well as the race they chose as well. From the U.S. Census definition, Hispanic is an ethnic origin and not a race.217,409
Median age (Male): The Median Age of all Males from the 2020 Census for this geographic area. The Male Median Age is the actual average from the 2020 Census, not an estimate or future projection. Median Age is the average age of the population. Half of the population is older than the average age and the other half is younger. Gender is self-reported by individuals when asked about their sex at birth.38.0
Median age (Female): The Median Age of all Females from the 2020 Census for this geographic area. The Female Median Age is the actual average from the 2020 Census, not an estimate or future projection. Median Age is the average age of the population. Half of the population is older than the average age and the other half is younger. Gender is self-reported by individuals when asked about their sex at birth.40.8
Total Households: Total Number of Households from the 2020 U.S. Census for this geographic area. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.386,931
Married-Couple Households: Total Married-Couple Households is based on the 2020 U.S. Census and is not an estimate. Under the U.S. Census Bureau definition, Married Couple Households refers to the count of households where the householder and his or her spouse are listed as members of the same household. It does include same-sex marriage households and the households themselves may also include other individuals, such as children or other relatives. 
Average Household Size for MONTGOMERY County, MD: 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.2.72
Average family size of MONTGOMERY County, MD: 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.2.97
Total housing units for MONTGOMERY County, MD: 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.404,423


MONTGOMERY County, MD Covers 30 Cities