20166 ZIP Code — Sterling, VA
Loudoun County, Virginia
ZIP code 20166 is located in Sterling, Virginia, within Loudoun County. It covers approximately 27.19 square miles and serves a population of 13,479 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 703/571.
About ZIP code 20166
The housing stock consists of a mix of housing types. Much of the housing stock is relatively new, reflecting recent development activity. Median home value is $534,400. Owner-occupancy sits near the national average at 51%.
Median household income is $133,085.
The dominant occupation class is management, business, and professional, with professional and management as the leading industry. The average commute of 30 minutes is near the national average.
Educational attainment is high — 61% of residents hold a bachelor's degree or higher, well above the national average of 33%.
13,479
population
27.19
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
20166 ZIP code map
Cities in ZIP code 20166
Below are the cities the US Postal Service accepts for ZIP code 20166. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Sterling | Acceptable |
| Sterling | Preferred |
Nearby ZIP codes
20102 Dulles (2.2 mi)
20102 Dulles (2.2 mi)
20148 Ashburn (2.7 mi)
20148 Ashburn (2.7 mi)
20147 Ashburn (4 mi)
20147 Ashburn (4 mi)
20149 Ashburn (4.3 mi)
20149 Ashburn (4.3 mi)
20164 Sterling (4.4 mi)
20164 Sterling (4.4 mi)
22095 Herndon (4.7 mi)
22095 Herndon (4.7 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 13,479 |
| Population density | 496 / sq mi |
| State FIPS | 51 |
| County FIPS | 107 |
| Geography | |
|---|---|
| Land area | 27.19 sq mi |
| Water area | 0.34 sq mi |
| Latitude | 38.9828 |
| Longitude | -77.4715 |
| Timezone | Eastern (ET) |
| Area code | 703/571 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 22.4% | 12.4% | 32.9% |
| $50k – $100k | 21.7% | 18.8% | 29.2% |
| $100k – $200k | 35.7% | 37.1% | 26.3% |
| Over $200k | 20.2% | 31.8% | 11.6% |
Demographics & statistics
13,479
Population
496
People per sq mi
33.9
Median age
$133,085
Median household income
$54,791
Per capita income
$534,400
Median home value
$2,176
Median monthly rent
50.6%
Home ownership
9.3%
Poverty rate
2.3%
Unemployment
2,607
Housing units
60.5%
Bachelor's or higher
Age distribution
Male
Female
574
Under 5
528
413
5–9
380
349
10–14
321
368
15–19
339
690
20–24
634
1,211
25–34
1,114
1,366
35–44
1,255
891
45–54
818
525
55–59
482
269
60–64
247
255
65–74
234
64
75–84
58
49
85+
45
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 2,972 | 22.0% |
| 18 and over | 10,507 | 78.0% |
| 65 and over | 705 | 5.2% |
| Median age | 33.9 years | |
Race & ethnicity
White
31%
Asian
26%
Hispanic or Latino
14%
Black or African American
11.8%
Other race
9.2%
Two or more races
7.3%
American Indian / Alaska Native
0.5%
Native Hawaiian / Pacific Islander
0.1%
| Group | Count | % |
|---|---|---|
| White | 4,859 | 31% |
| Asian | 4,080 | 26% |
| Hispanic or Latino | 2,186 | 14% |
| Black or African American | 1,856 | 11.8% |
| Other race | 1,448 | 9.2% |
| Two or more races | 1,138 | 7.3% |
| American Indian / Alaska Native | 76 | 0.5% |
| Native Hawaiian / Pacific Islander | 22 | 0.1% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 22.4% | 12.4% | 32.9% |
| $50k – $100k | 21.7% | 18.8% | 29.2% |
| $100k – $200k | 35.7% | 37.1% | 26.3% |
| Over $200k | 20.2% | 31.8% | 11.6% |
Under $10k
3.3%
$10k–$15k
1.0%
$15k–$25k
1.1%
$25k–$35k
6.7%
$35k–$50k
3.2%
$50k–$75k
10.9%
$75k–$100k
12.4%
$100k–$150k
17.7%
$150k–$200k
18.9%
$200k+
24.9%
| Range | % of households |
|---|---|
| Under $10k | 3.3% |
| $10k–$15k | 1.0% |
| $15k–$25k | 1.1% |
| $25k–$35k | 6.7% |
| $35k–$50k | 3.2% |
| $50k–$75k | 10.9% |
| $75k–$100k | 12.4% |
| $100k–$150k | 17.7% |
| $150k–$200k | 18.9% |
| $200k+ | 24.9% |
| Median income | $133,085 |
Housing
Home values
$50k–$100k
0.7%
$100k–$150k
1.8%
$150k–$200k
1.8%
$200k–$300k
3.4%
$300k–$500k
36.5%
$500k–$1M
53.2%
$1M+
2.6%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $534,400 |
| Median rent / month | $2,176 |
| Owner occupied | 50.6% |
| Renter occupied | 49.4% |
| Vacant | 2.0% |
| Single-family detached | 11.3% |
| Large apartment buildings | 14.9% |
| Mobile homes | 0.0% |
| Median rooms | 5.2 |
| Avg household size (owned) | 2.73 |
Year built
| Era | % |
|---|---|
| 2020 or later | 1.9% |
| 2010–2019 | 33.1% |
| 2000–2009 | 23.0% |
| 1990–1999 | 32.1% |
| 1980–1989 | 3.8% |
| 1970–1979 | 2.4% |
| 1960–1969 | 1.0% |
| 1950–1959 | 1.5% |
| 1940–1949 | 0.2% |
| 1939 or earlier | 1.0% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 1.9% |
| 1 bedroom | 10.1% |
| 2 bedrooms | 29.6% |
| 3 bedrooms | 42.3% |
| 4 bedrooms | 13.6% |
| 5+ bedrooms | 2.4% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 4.0% |
| 1 vehicle | 27.0% |
| 2 vehicles | 47.0% |
| 3 or more | 22.0% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 69.1% |
| Electricity | 28.2% |
| Propane / LP gas | 1.7% |
| No fuel used | 0.1% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 2,698 | 54.5% |
| Cohabiting couple | 273 | 5.5% |
| Male householder, no spouse | 951 | 19.2% |
| Female householder, no spouse | 1,024 | 20.7% |
| Households with children under 18 | 1,990 | 40.2% |
| Households with seniors (65+) | 563 | 11.4% |
| Average household size | 2.73 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 35.0% | 29.5% |
| Married | 54.7% | 53.7% |
| Separated | 2.6% | 1.5% |
| Widowed | 1.4% | 6.7% |
| Divorced | 6.3% | 8.6% |
Education
Less than 9th grade
4.3%
Some HS, no diploma
4.6%
HS graduate
14.1%
Some college, no degree
13.0%
Associate's degree
3.4%
Bachelor's degree
34.6%
Graduate / professional
25.9%
| Metric | % |
|---|---|
| HS diploma or higher | 91.0% |
| Bachelor's or higher | 60.5% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 198 | 5.7% |
| Kindergarten | 58 | 1.7% |
| Elementary school | 1,275 | 36.8% |
| High school | 628 | 18.2% |
| College / grad school | 1,301 | 37.6% |
Employment
Industry of employment
Professional & management
26.9%
Education & healthcare
14.1%
Retail trade
10.3%
Finance & real estate
8.9%
Public administration
8.4%
Construction
7.6%
Transportation & utilities
6.2%
Arts, food & hospitality
5.7%
Manufacturing
5.3%
Information
3.3%
Other services
2.9%
Wholesale trade
0.4%
Agriculture & mining
0.1%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 59.4% |
| Service | 10.5% |
| Sales & office | 16.6% |
| Natural resources & construction | 5.7% |
| Production & transportation | 7.6% |
Employment type
| Type | % |
|---|---|
| Private sector | 80.1% |
| Government | 14.6% |
| Self-employed | 5.2% |
| Unpaid family workers | 0.1% |
Commute
| Method | % |
|---|---|
| Drive alone | 72.8% |
| Carpool | 10.9% |
| Public transit | 0.9% |
| Walk | 0.6% |
| Work from home | 14.2% |
| Other means | 0.6% |
| Avg commute (minutes) | 29.5 |
Poverty
All people
9.3%
Under 18 years
16.4%
18 and over
7.3%
Married-couple families
9.2%
Female-led households
11.2%
Income support
| Source | % of households |
|---|---|
| Social Security | 10.0% |
| Retirement income | 10.5% |
| Supplemental Security | 3.0% |
| Cash public assistance | 0.6% |
| Food stamps / SNAP | 5.2% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 29.4% |
| High blood pressure | 23.7% |
| High cholesterol | 24.8% |
| Diabetes | 7.6% |
| Heart disease | 2.9% |
| Stroke | 1.6% |
| Asthma | 8.5% |
| Arthritis | 15.0% |
| Kidney disease | 1.7% |
| Pulmonary disease | 3.4% |
| Cancer | 3.2% |
| Behavior / access | % |
|---|---|
| Smoking | 14.5% |
| Binge drinking | 15.0% |
| No physical activity | 20.3% |
| Less than 7 hrs sleep | 35.7% |
| Depression | 16.4% |
| Fair or poor health | 11.2% |
| Poor mental health | 12.8% |
| Poor physical health | 6.8% |
| No health insurance | 15.1% |
| Visited doctor (checkup) | 70.0% |
| Visited dentist | 65.0% |
| Cholesterol screening | 88.7% |
| Teeth loss | 8.0% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 647 | 6.2% |
| Disability | % |
|---|---|
| Any disability | 5.7% |
| Under 18 | 4.2% |
| 18–64 years | 4.5% |
| 65 and over | 27.5% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 82.0% |
| Public insurance | 12.0% |
| No insurance | 9.9% |
| Uninsured under 19 | 4.0% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 12,377 | 91.8% |
| Spanish | 1,677 | 13.5% |
| Other Indo-European | 602 | 4.9% |
| Asian & Pacific Islander | 456 | 3.7% |
| Other languages | 508 | 4.1% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 7,962 | 59.1% |
| Born in same state | 7,672 | 56.9% |
| Born in different state | 3,779 | 28.0% |
| Foreign born | 290 | 2.2% |
| Naturalized citizen | 5,517 | 40.9% |
| Not a US citizen | 3,403 | 61.7% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| French | 952 | 7.1% |
| Italian | 688 | 5.1% |
| Arab | 629 | 4.7% |
| English | 178 | 1.3% |
| Ancestry | Count | % |
|---|---|---|
| German | 115 | 0.9% |
| Irish | 87 | 0.6% |
| Polish | 54 | 0.4% |
| Norwegian | 36 | 0.3% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 36.7% |
| Internet access | 99.9% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 20166
What city is ZIP code 20166 in?
ZIP code 20166 is primarily assigned to Sterling, Virginia.
What county is ZIP code 20166 in?
ZIP code 20166 falls within Loudoun County, Virginia.
How educated is the population of ZIP code 20166?
61% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.
What is the median household income in ZIP code 20166?
The median household income in ZIP code 20166 is $133,085, above the national median of ~$75,000.
What is the typical home value in ZIP code 20166?
The median home value in ZIP code 20166 is $534,400.
What is the population of ZIP code 20166?
ZIP code 20166 has an estimated population of 13,479 residents, with a density of 496 people per square mile.
What timezone is ZIP code 20166 in?
ZIP code 20166 observes the EST timezone.