ZIP 21778 · Rocky Ridge
Who lives in ZIP code 21778 (Rocky Ridge, MD): age, income, housing, education and work.
Source: uszips 2026 (ACS-based ZIP file)
2026 ZIP profile
Rocky Ridge, MD · Frederick County
uszips 2026
People745
Median age58.4
Household income$76,458
Home value$422,648
Median rent—
Poverty0.9%
College degree+27.0%
Commute26 min
Place
- Metro area
- Washington-Arlington-Alexandria, DC-VA-MD-WV
- Wider region
- Washington-Baltimore-Arlington, DC-MD-VA-WV-PA
- Metro division
- Frederick-Gaithersburg-Bethesda, MD
- Time zone
- Eastern
- Density
- 16 / sq mi
- Housing units
- 332
County
Share of the ZIP's people in each county.
Age mix
33.7% are 65 or older; 84.3% are adults.
Household income
42.5% of households earn $100K+. Median per person: $46,583.
Education (adults 25+)
41.3% of degrees are in STEM fields.
Race
0.0% Hispanic or Latino (of any race).
Households & family
- Married
- 44.9%
- Never married
- 25.1%
- Divorced
- 6.7%
- Widowed
- 23.3%
- Family size
- 3.59
- Dual-income families
- 65.6%
Housing
- Own their home
- 81.3%
- Rent burden
- —
- Men / women
- 39% / 61%
Work
- In labor force
- 52.9%
- Unemployment
- 6.5%
- Self-employed
- 16.0%
- Farmers
- 8.0%
Community
- Charitable givers
- 30.0%
- Veterans
- 2.4%
- With a disability
- 14.4%
- No health insurance
- 1.7%
- Limited English
- 0.0%
Source: uszips 2026 (ACS-based ZIP file). Shares are percentages of people, households or adults as the measure implies.