PlainZIP

Cabin John, MD · standard

ZIP Code 20818

Montgomery County, Maryland — Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

1,962
743/sq mi
$245,982
Median income
$1,335,100
Median home value
86.4%
Bachelor's or higher

The verdict

Cabin John pairs a top-decile household income with top-decile home values, in a low-density, homeowner-dominated area.

Top 1%
household income, US ZIPs
Top 1%
home value, US ZIPs
743
people per sq mi
95%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 20818 against every reporting US ZIP.

ZIP code 20818 is classified by USPS as a standard delivery area and covers roughly 2.6 square miles in Cabin John, Montgomery County, Maryland. The area is home to 1,962 residents, producing a population density of 743 people per square mile, and falls within the New York time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 20818 against Maryland and the nation.

On the economic side, the median household income for ZIP 20818 sits at $245,982 (116% above the Maryland average), while per-capita income is $159,058. The poverty rate stands at 1.1% and the unemployment rate at 0.0%. On housing, the median home value is $1,335,100 (198% above the state average) with median rent at — per month, and 95.3% of occupied units are owner-occupied, a direct signal of whether 20818 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 86.4% of adults hold a bachelor's degree or higher, the median age is 52.7, and the average commute is —. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Montgomery County, so you can benchmark 20818 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →

Top industries in ZIP 20818

Top 5 sectors by establishment count

Which industries have the most business establishments in ZIP 20818.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + HUD FMR + FHFA HPI ACS demographics, ZBP business establishments, HUD Fair Market Rents, FHFA HPI for ZIP 20818, Cabin John, MD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; HUD FMR + FHFA HPI updated quarterly/annually.

Quick Facts

1,962

Population

2.6

Area (sq mi)

743

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 20818?

52.7

Median Age

44.6%

Male

55.4%

Female

15.8%

Foreign-Born

White 66.8%
African American 3.1%
Asian 10.5%
American Indian or Alaska Native 0.1%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 13.4%
Hispanic or Latino 4.7%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$245,982

Median Household Income

+116% vs state

$159,058

Per Capita Income

1.1%

Poverty Rate

0.0%

Unemployment Rate

How ZIP 20818 ranks nationally

Household income vs. every US ZIP code

Median household income — the full national distribution, with this ZIP marked

$245,982 Top 1% higher than 99% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). Below this entry. $180,000–$200,000: 186 US ZIPs (1%). Below this entry. $200,000–$220,000: 324 US ZIPs (1%). This entry sits in this band. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau — ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 94.4%
Bachelor's Degree or Higher 86.4%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

657

Total Housing Units

593

Occupied Units

64

Vacant Units

2.60

Avg Household Size

Occupancy Type

Owner 95.3%
Renter 4.7%

$1,335,100

Median Home Value

+198% vs state

1982

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+15.0%

YoY Change (2022)

289

HPI Index (2000 = 100)

+189%

Total Change Since 2000

Home values in ZIP 20818 have increased 15.0% over the past year (2022). Since 2000, this ZIP has seen +189% cumulative appreciation.

Year Annual Change HPI Index
2018 +7.4% 245
2019 -12.8% 213
2020 +15.5% 246
2021 +2.1% 252
2022 +15.0% 289

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2022. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 52 business establishments in ZIP 20818, employing approximately 500 people with a combined annual payroll of $36,588,000.

52

Businesses

500

Employees

$36.6M

Annual Payroll

6

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 15 28.9%
Construction 8 15.4%
Health care and social assistance 6 11.5%
Accommodation and food services 6 11.5%
Information 5 9.6%
Other services (except public administration) 3 5.8%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 20818 vs 20812 →

ZIP 20818 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 20818 ranks #0 by population — useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 20818 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 20818 ranks #3 of 9 neighboring ZIPs — local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
20812 Glen Echo, MD 255 1.1 mi
20817 Bethesda, MD 36,240 1.8 mi
22101 Mc Lean, VA 29,887 2.4 mi
20816 Bethesda, MD 16,208 2.7 mi
22213 Arlington, VA 2,936 5.4 mi
22102 Mc Lean, VA 21,985 3.9 mi
20814 Bethesda, MD 27,642 3.9 mi
20815 Chevy Chase, MD 29,082 4.6 mi
22046 Falls Church, VA 16,235 6.1 mi
22207 Arlington, VA 30,920 5.1 mi

More ZIP Codes in Montgomery County

20906 standard
Silver Spring, MD
Pop: 64,696
20878 standard
Gaithersburg, MD
Pop: 62,446
20874 standard
Germantown, MD
Pop: 57,367
20904 standard
Silver Spring, MD
Pop: 54,612
20854 standard
Potomac, MD
Pop: 49,611
20902 standard
Silver Spring, MD
Pop: 48,841

Related Areas

Montgomery County Cabin John, MD Maryland

Frequently Asked Questions

What county is ZIP code 20818 in? ▼
ZIP code 20818 (Cabin John) is located in Montgomery County, Maryland. Montgomery County contains multiple ZIP codes, see the full list at /counties/montgomery-md.
What is the population of ZIP code 20818? ▼
ZIP code 20818 in Cabin John, MD has a population of 1,962 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 20818? ▼
The median household income in ZIP 20818 is $245,982, which is 222% above the national average of $76,288.
What is the average home value in ZIP 20818? ▼
The median home value in ZIP 20818 is $1,335,100, which is 380% above the national average of $278,155.
What is the demographic makeup of ZIP 20818? ▼
The largest racial group in ZIP 20818 is White at 66.8%. Hispanic or Latino residents make up 4.7% of the population.
How many businesses are in ZIP code 20818? ▼
ZIP code 20818 has 52 business establishments employing approximately 500 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 20818? ▼
The top industries by establishment count in ZIP 20818 are: Professional, scientific, and technical services (15), Construction (8), Health care and social assistance (6). There are 6 industry sectors represented in total.
How have home values changed in ZIP code 20818? ▼
According to the FHFA House Price Index, home values in ZIP 20818 increased by 15.0% in 2022. Since 2000, home values in this ZIP have appreciated by approximately 189%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 20818? ▼
In ZIP code 20818, 94.4% of residents aged 25+ have a high school diploma or higher, and 86.4% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 20818? ▼
In ZIP code 20818, approximately 95.3% of occupied housing units are owner-occupied and 4.7% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 20818? ▼
The poverty rate in ZIP code 20818 is 1.1% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

ZIP Code Research Guides

Reading Census Demographics
How to interpret population, income, and education data from the Census Bureau.
Understanding ZIP Code Data
What ZIP codes are, how ZCTAs differ, and what the data reveals.
Best ZIP Codes for Families
Key factors to evaluate when choosing a family-friendly neighborhood.
ZIP Codes for Relocation
Data-driven tips for evaluating ZIP codes before a move.

Official Data Resources for Cabin John, MD

Verify and explore additional data for this area using these official government sources.

U.S. Census Bureau
Official demographic, economic, and housing data from the American Community Survey.
HUD Fair Market Rents
Department of Housing and Urban Development rental cost estimates by metropolitan area.
FBI Uniform Crime Reports
Official crime statistics compiled from law enforcement agencies nationwide.
FHFA House Price Index
Federal Housing Finance Agency home value trends based on repeat sales and appraisals.

Read our methodology to see how this data is sourced, computed, and verified.