Residential delivery area · Maryland
ZIP Code 20850: Rockville, MD
ZIP code 20850 is in Rockville, Maryland, entirely in Montgomery County (Census 2020 ZIP-county file). About 50,000 people live there (Census Bureau, ACS 2020-2024), the most populous of Rockville's 4 residential ZIP codes. Median household income is $125,950 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Rockville (54%), Travilah (19%) and North Potomac (10%); 17% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Rockville · 4 residential ZIPs
- County
- Montgomery County
- Census places
- Rockville (54%); Travilah (19%) census-designated place; North Potomac (10%) census-designated place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- House districts
- MD-8 (97%), MD-6 (3%) 119th Congress, by share of land
- State
- Maryland
- Time zone
- Eastern
- Land area
- 14.1 sq mi · 3,567 people per sq mi
Where is ZIP code 20850?
20850 centers on 39.089°, -77.180° and covers 14.1 square miles of land plus 0.1 of water. It borders 7 ZIP codes: 20851, 20877, 20852, 20878, 20855, 20854, 20853.
The map draws ZIP code areas only. For the streets inside 20850, 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 20850 compare with the rest of Rockville?
| Measure | 20850 | In Rockville | In Montgomery County | In MD |
|---|---|---|---|---|
| People (ACS 2020-2024) | 50,353 | 1st of 4 | 7th of 53 | 18th of 477 |
| Median household income | $126k | 3rd of 4 | 27th of 41 | 102nd of 293 |
| Median home value | $714k | 1st of 4 | 18th of 41 | 27th of 320 |
Its median household income is higher than in 92% of U.S. residential ZIP codes, and it is denser than 90% 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 20850?
The 2020 Census counted 51,045 people in 20850; the ACS, which samples households over 2020-2024, estimates 50,353. Between the 2010 and 2020 censuses its population grew 10.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 50,353
- 2020 Census count
- 51,045+10.2% since 2010 (46,340)
- Households
- 21,159
- Median age
- 41.2
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 20850?
Of the 50,353 people the ACS estimates in 20850, 18.5% are under 18 and 20.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (41.4%), then Asian (not Hispanic) (27.8%).
- Under 1818.5%
- 18 to 6461.1%
- 65 and older20.4%
- White, not Hispanic41.4%
- Asian, not Hispanic27.8%
- Hispanic or Latino12.6%
- Black, not Hispanic11.7%
- Other or two or more6.5%
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 20850 earn?
Median household income is $125,950 (ACS 2020-2024), the 27th highest of the 41 ranked ZIP codes in Montgomery County. It is not measurably different from 2015-2019 ($134,606 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $125,950
- Income per person
- $68,066
- Below the poverty line
- 6.9%
- Unemployed (of the labor force)
- 4.6%
- Adults 25+ with a bachelor's degree
- 67.5%
- Adjusted gross income per tax return, 2022
- $138,83225,850 returns; wages 65% 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 20850?
FHFA's house price index for 20850, built from repeat sales and appraisals of the same homes, rose 44% from 2015 to 2025 and rose 33% from 2020 to 2025, and moved +0.2% in 2025.
- Median home value (owners' estimate)
- $714,400
- Median gross rent
- $2,309
- Homes owned by their occupants
- 50.3%
- Housing units
- 22,418
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 20850?
2,728 business establishments had a location in this ZIP code in 2023, 123 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services790
- Health care and social assistance440
- Other services (except public administration)243
- Finance and insurance191
- Accommodation and food services178
- Construction145
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 20850?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 20851 | Rockville | 14,946 | $126k | 3.3 mi |
| 20877 | Gaithersburg | 38,546 | $93k | 3.6 mi |
| 20852 | Rockville | 48,180 | $123k | 4.0 mi |
| 20878 | Gaithersburg | 66,115 | $144k | 4.1 mi |
| 20855 | Derwood | 17,279 | $149k | 4.2 mi |
| 20854 | Potomac | 50,498 | $250k+ | 4.5 mi |
| 20853 | Rockville | 31,851 | $159k | 4.7 mi |
| 20880 | Washington Grove | 577 | $135k | 3.6 mi (near) |
| 20899 | Gaithersburg | 57 | $24k | 4.3 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.