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 High-density area
- $245,982
- Median income Above-median income area
- $1,335,100
- Median home value Above-median home value
- 86.4%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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 covers 2.6 square miles in Cabin John, Montgomery County, Maryland (a standard USPS delivery area), with a modest 1,962 residents on file, a density of 743 people per square mile, in the New York time zone.
ZIP 20818 skews affluent, with a median household income of $245,982 (116% above the average Maryland ZIP), while per-capita income is $159,058. Both reported hardship measures are comparatively low in absolute terms: poverty is 1.1% and unemployment is 0.0%. Housing is both higher-cost and owner-heavy: median home value is $1,335,100 (198% above the average Maryland ZIP), while 95.3% of occupied homes are owner-occupied.
This is a highly-educated ZIP: 86.4% of adults hold a bachelor's degree or higher, the median age is 52.7, and the average commute is -. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Montgomery County, so 20818 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Top industries in ZIP 20818
Top 5 sectors by establishment count in Cabin John, MD
Which industries have the most business establishments in ZIP 20818.
- Professional, scientific, and technical services
Professional, scientific, and technical services
15 establishments
- Construction
Construction
8 establishments
- Health care and social assistance
Health care and social assistance
6 establishments
- Accommodation and food services
Accommodation and food services
6 establishments
- Information 5
Information
5 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, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, 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; 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
Who lives in ZIP 20818?
52.7
Median Age
44.6%
Male
55.4%
Female
15.8%
Foreign-Born
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 ZIP avg
$159,058
Per Capita Income
1.1%
Poverty Rate
0.0%
Unemployment Rate
How ZIP 20818 ranks among Maryland ZIPs
Cabin John, MD household income vs. every Maryland ZIP code
Median household income among 419 reporting Maryland ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$245,982 Top 2% higher than 98% of 419 Maryland ZIPs
Each bar is a $20K-wide band; taller bars hold more Maryland 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
657housing units
657
Total Housing Units
593
Occupied Units
64
Vacant Units
2.60
Avg Household Size
Occupancy Type
$1,335,100
Median Home Value
+198% vs state ZIP avg
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.
- 20817
Bethesda (20817)
36,240 residents
- 22207
Arlington (22207)
30,920 residents
- 22101
Mc Lean (22101)
29,887 residents
- 20815
Chevy Chase (20815)
29,082 residents
- 20814
Bethesda (20814)
27,642 residents
- 22102
Mc Lean (22102)
21,985 residents
- 22046
Falls Church (22046)
16,235 residents
- 20816
Bethesda (20816)
16,208 residents
- 22213 2,936
Arlington (22213)
2,936 residents
What this shows Among its immediate neighbors, ZIP 20818 ranks #0 by population - useful context the national average alone can't give.
ZIP 20818 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 22101
Mc Lean (22101)
$250,000 median income
- 20817
Bethesda (20817)
$249,332 median income
- 20818
Cabin John (20818)
$245,982 median income
- 22207
Arlington (22207)
$245,745 median income
- 20816
Bethesda (20816)
$232,656 median income
- 20812
Glen Echo (20812)
$213,750 median income
- 22213
Arlington (22213)
$199,306 median income
- 20815
Chevy Chase (20815)
$194,971 median income
- 22046
Falls Church (22046)
$168,882 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 20818, both outside MD so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (1,962 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Montgomery County
Related Areas
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.
Related
Take this with you
What to do with ZIP 20818's numbers, next.
- See how ZIP 20818 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Cabin John, MD ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.