ZIP 21758 · Knoxville
Who lives in ZIP code 21758 (Knoxville, MD): age, income, housing, education and work.
Source: uszips 2026 (ACS-based ZIP file)
2026 ZIP profile
Knoxville, MD · Washington County
uszips 2026
People4,409
Median age39.0
Household income$111,528
Home value$414,086
Median rent$1,770/mo
Poverty5.9%
College degree+43.7%
Commute36 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
- 53 / sq mi
- Housing units
- 1,588
Spans 2 counties
Share of the ZIP's people in each county.
Age mix
17.7% are 65 or older; 75.8% are adults.
Household income
58.3% of households earn $100K+. Median per person: $59,332.
Education (adults 25+)
46.8% of degrees are in STEM fields.
Race
9.0% Hispanic or Latino (of any race).
Households & family
- Married
- 58.5%
- Never married
- 24.2%
- Divorced
- 14.0%
- Widowed
- 3.3%
- Family size
- 3.18
- Dual-income families
- 62.7%
Housing
- Own their home
- 84.4%
- Rent burden
- 32.0%
- Men / women
- 52% / 49%
Work
- In labor force
- 70.8%
- Unemployment
- 8.5%
- Self-employed
- 14.0%
- Farmers
- 2.3%
Community
- Charitable givers
- 40.2%
- Veterans
- 6.9%
- With a disability
- 7.7%
- No health insurance
- 7.3%
- Limited English
- 0.0%
Source: uszips 2026 (ACS-based ZIP file). Shares are percentages of people, households or adults as the measure implies.