Data Last Updated: December 1, 2024

LOUDOUN County, VA ZIP Codes

LOUDOUN County, VA Covers 37 ZIP Codes

ZIP Code	Classification	City	Population	Area Code(s)
ZIP Code 20101	Unique	Dulles	0	703/571
ZIP Code 20102	Unique	Dulles	0	703/571
ZIP Code 20103	Unique	Dulles	0	703/571
ZIP Code 20104	Unique	Dulles	0	703/571
ZIP Code 20105	General	Aldie	34,475	540/571/703/826
ZIP Code 20117	General	Middleburg	2,746	540/826
ZIP Code 20118	P.O. Box	Middleburg	0	540/826
ZIP Code 20120 *	General	Centreville	42,697	703/571
ZIP Code 20129	General	Paeonian Springs	482	540/703/826
ZIP Code 20130 *	General	Paris	359	703/540/826
ZIP Code 20131	P.O. Box	Philomont	0	540/826
ZIP Code 20132	General	Purcellville	18,483	540/826
ZIP Code 20134	P.O. Box	Purcellville	0	540/826
ZIP Code 20135 *	General	Bluemont	2,935	703/540/826
ZIP Code 20141	General	Round Hill	8,178	540/826
ZIP Code 20142	P.O. Box	Round Hill	0	540/826
ZIP Code 20146	P.O. Box	Ashburn	0	703/571
ZIP Code 20147	General	Ashburn	66,394	703/571
ZIP Code 20148	General	Ashburn	61,793	571/703
ZIP Code 20149	Unique	Ashburn	0	703/571
ZIP Code 20152	General	Chantilly	37,013	571/703
ZIP Code 20158	General	Hamilton	4,639	540/826
ZIP Code 20159	P.O. Box	Hamilton	0	540/826
ZIP Code 20160	P.O. Box	Lincoln	0	540/826
ZIP Code 20164	General	Sterling	40,888	703
ZIP Code 20165	General	Sterling	33,777	703
ZIP Code 20166	General	Sterling	14,164	703/571
ZIP Code 20167	P.O. Box	Sterling	0	571/703
ZIP Code 20175	General	Leesburg	33,245	540/571/703/826
ZIP Code 20176	General	Leesburg	51,777	540/571/703/826
ZIP Code 20177	P.O. Box	Leesburg	0	540/571/703/826
ZIP Code 20178	P.O. Box	Leesburg	0	540/571/703/826
ZIP Code 20180	General	Lovettsville	8,073	540/826
ZIP Code 20184 *	General	Upperville	735	540/703/826
ZIP Code 20189	General	Dulles	0	571/703
ZIP Code 20197	General	Waterford	2,558	571/703/826
ZIP Code 22066 *	General	Great Falls	18,165	703

* Indicates a Multi County ZIP Code, whose primary County is something other than Loudoun, VA.

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 Loudoun County, VA, 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.	420,959 (More Details)
Male Population: The sum of all males for Loudoun County, VA 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.	207,191
Female Population: The sum of all females for Loudoun County, VA 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.	213,768
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.	37

ZIP Codes: The total number of ZIP Codes which at least partially fall inside Loudoun County, VA. 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.	34
Cities: The total number of City names which are associated with ZIP Codes that partially or wholly cross into Loudoun County, VA. 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.	16
Counties: The total number of counties associated with ZIP Codes that are at least partially part of Loudoun County, VA.	1
Area Codes: The total number of Area Codes associated with ZIP Codes in Loudoun County, VA. 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.	4

Total Area: The approximate amount of area covered by Loudoun, VA in square miles. This includes all land and water areas within the legal county boundaries.	521 square miles (county)
Land Area: The approximate amount of land area covered by Loudoun, VA 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.	516 square miles (county)
Water Area: The approximate amount of water area covered by Loudoun, VA 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.	6 square miles (county)

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LOUDOUN, VA Demographic Information

* Demographic data is based on 2020 Census.

Total population of LOUDOUN County, VA: 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.	420,959
Male population of LOUDOUN County, VA: 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.	207,191
Female population of LOUDOUN County, VA: 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.	213,768
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.	37.0
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.	225,974
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.	30,568
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.	1,582
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.	89,779
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.	263
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.	59,744
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.	36.4
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.	37.6
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.	137,442
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 LOUDOUN County, VA: 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.	3.05
Average family size of LOUDOUN County, VA: 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.	2.63
Total housing units for LOUDOUN County, VA: 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.	142,074

LOUDOUN County, VA ZIP Codes

LOUDOUN County, VA Covers 37 ZIP Codes

LOUDOUN, VA Demographic Information

LOUDOUN County, VA Covers 16 Cities