Residential delivery area · Maryland
ZIP Code 20818: Cabin John, MD
ZIP code 20818 is in Cabin John, Maryland, entirely in Montgomery County (Census 2020 ZIP-county file). About 1,500 people live there (Census Bureau, ACS 2020-2024). Median household income is $245,982 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2022
- ZBP2023
- IRS2022
- Town
- Cabin John · its only residential ZIP
- County
- Montgomery County
- Census places
- Cabin John census-designated place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- House district
- MD-8 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 0.9 sq mi · 1,658 people per sq mi
Where is ZIP code 20818?
20818 centers on 38.973°, -77.162° and covers 0.9 square miles of land plus 0.4 of water. It borders 4 ZIP codes: 20812, 20817, 22101, 20854.
The map draws ZIP code areas only. For the streets inside 20818, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 20818 compare with the rest of Montgomery County?
| Measure | 20818 | In Montgomery County | In MD |
|---|---|---|---|
| People (ACS 2020-2024) | 1,539 | 42nd of 53 | 326th of 477 |
| Median household income | $246k | 3rd of 41 | 6th of 293 |
| Median home value | $1.34M | 1st of 41 | 1st of 320 |
Its median household income is higher than in more than 99% of U.S. residential ZIP codes, and it is denser than 83% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 20818?
The 2020 Census counted 1,832 people in 20818; the ACS, which samples households over 2020-2024, estimates 1,539. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 1,539±366 (90% margin)
- 2020 Census count
- 1,832
- Households
- 593
- Median age
- 52.7
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 20818?
Of the 1,539 people the ACS estimates in 20818, 21.5% are under 18 and 23.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (66.8%), then Other or two or more (14.9%).
- Under 1821.5%
- 18 to 6454.9%
- 65 and older23.6%
- White, not Hispanic66.8%
- Other or two or more14.9%
- Asian, not Hispanic10.5%
- Hispanic or Latino4.7%
- Black, not Hispanic3.1%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 20818 earn?
Median household income is $245,982 (ACS 2020-2024), the 3rd highest of the 41 ranked ZIP codes in Montgomery County.
- Median household income
- $245,982±$53,171
- Income per person
- $159,058
- Below the poverty line
- 1.1%
- Unemployed (of the labor force)
- 0.0%
- Adults 25+ with a bachelor's degree
- 86.4%
- Adjusted gross income per tax return, 2022
- $291,894880 returns; wages 54% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 20818?
- Median home value (owners' estimate)
- $1,335,100
- Median gross rent
- –
- Homes owned by their occupants
- 95.3%
- Housing units
- 657
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 20818?
52 business establishments had a location in this ZIP code in 2023, 8 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services15
- Construction8
- Health care and social assistance6
- Accommodation and food services6
- Information5
- Other services (except public administration)3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 20818?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 20812 | Glen Echo | 276 | $214k | 1.1 mi |
| 20817 | Bethesda | 37,454 | $249k | 1.7 mi |
| 22101 | McLean, VA | 30,953 | $250k+ | 2.3 mi |
| 20854 | Potomac | 50,498 | $250k+ | 5.2 mi |
| 20816 | Bethesda | 18,140 | $233k | 2.5 mi (near) |
| 20894 | Bethesda | 0 | – | 3.6 mi (near) |
| 20892 | Bethesda | 0 | – | 3.7 mi (near) |
| 20814 | Bethesda | 32,795 | $151k | 3.9 mi (near) |
| 22102 | McLean, VA | 29,184 | $154k | 3.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.