Residential delivery area · Maryland
ZIP Code 21704: Frederick, MD
ZIP code 21704 uses the postal name Frederick, Maryland and lies entirely in Frederick County (Census 2020 ZIP-county file). About 20,000 people live there (Census Bureau, ACS 2020-2024), the 4th most populous of Frederick's 5 residential ZIP codes. Median household income is $161,063 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Urbana (15%), Ballenger Creek (15%) and Bartonsville (7%), and 1% in smaller places; 62% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Frederick · 5 residential ZIPs
- County
- Frederick County
- Census places
- Urbana (15%) census-designated place; Ballenger Creek (15%) census-designated place; Bartonsville (7%) census-designated place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- House district
- MD-6 119th Congress
- State
- Maryland
- Time zone
- Eastern
- Land area
- 26.6 sq mi · 751 people per sq mi
- PO Box ZIPs
- 21709 also use the name Frederick
Where is ZIP code 21704?
21704 centers on 39.355°, -77.376° and covers 26.6 square miles of land plus 0.2 of water. It borders 6 ZIP codes: 21717, 21754, 21710, 21703, 21701, 20842.
The map draws ZIP code areas only. For the streets inside 21704, 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 21704 compare with the rest of Frederick?
| Measure | 21704 | In Frederick | In Frederick County | In MD |
|---|---|---|---|---|
| People (ACS 2020-2024) | 20,006 | 4th of 5 | 6th of 35 | 126th of 477 |
| Median household income | $161k | 1st of 4 | 8th of 26 | 41st of 293 |
| Median home value | $612k | 1st of 4 | 5th of 28 | 48th of 320 |
Its median household income is higher than in 97% of U.S. residential ZIP codes, and it is denser than 76% 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 21704?
The 2020 Census counted 19,275 people in 21704; the ACS, which samples households over 2020-2024, estimates 20,006. Between the 2010 and 2020 censuses its population grew 44.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 20,006
- 2020 Census count
- 19,275+44.7% since 2010 (13,321)
- Households
- 6,136
- Median age
- 38.6
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 21704?
Of the 20,006 people the ACS estimates in 21704, 32.7% are under 18 and 10.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (50.2%), then Asian (not Hispanic) (17.8%).
- Under 1832.7%
- 18 to 6456.5%
- 65 and older10.9%
- White, not Hispanic50.2%
- Asian, not Hispanic17.8%
- Hispanic or Latino14.7%
- Black, not Hispanic11.3%
- Other or two or more6.0%
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 21704 earn?
Median household income is $161,063 (ACS 2020-2024), the 8th highest of the 26 ranked ZIP codes in Frederick County. It fell from $182,766 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $161,063
- Income per person
- $59,928
- Below the poverty line
- 2.9%
- Unemployed (of the labor force)
- 3.3%
- Adults 25+ with a bachelor's degree
- 57.4%
- Adjusted gross income per tax return, 2022
- $141,36110,100 returns; wages 77% 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 21704?
FHFA's house price index for 21704, built from repeat sales and appraisals of the same homes, rose 62% from 2015 to 2025 and rose 43% from 2020 to 2025, and moved +2.6% in 2025.
- Median home value (owners' estimate)
- $612,000
- Median gross rent
- $2,536
- Homes owned by their occupants
- 82.0%
- Housing units
- 6,257
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 21704?
954 business establishments had a location in this ZIP code in 2023, 156 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services159
- Retail trade133
- Construction112
- Accommodation and food services91
- Health care and social assistance85
- Other services (except public administration)81
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 21704?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 21717 | Buckeystown | 245 | $158k | 3.2 mi |
| 21754 | Ijamsville | 8,156 | $182k | 3.6 mi |
| 21710 | Adamstown | 4,661 | $164k | 4.4 mi |
| 21703 | Frederick | 41,960 | $106k | 5.3 mi |
| 21701 | Frederick | 43,048 | $107k | 6.5 mi |
| 20842 | Dickerson | 2,369 | $204k | 10.9 mi |
| 21705 | Frederick | 6 | – | 4.2 mi (near) |
| 21770 | Monrovia | 8,751 | $184k | 6.4 mi (near) |
| 21774 | New Market | 17,134 | $171k | 6.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.