ZIP 21830 vs ZIP 21840
A side-by-side comparison of ZIP Code 21830 and ZIP Code 21840: population, income, housing, and more.
ZIP 21830 and ZIP 21840 are ZIP Code areas in Maryland. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.
ZIP 21830 has the higher population (5,001 vs 573 in ZIP 21840). ZIP 21840 has the higher median household income ($120,324 vs $110,015 in ZIP 21830). Since 2019, ZIP 21840's population has grown faster (+30.8% vs +23.2%).
Population, income & housing
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| Population | 5,001 | 573 |
| Median age | 38.9 yrs | 48.5 yrs |
| Median household income | $110,015 | $120,324 |
| Median home value | $244,900 | — |
| Median gross rent | $1,413 | — |
| Housing units | 1,872 | 404 |
| Homeownership rate | 86.3% | 78.2% |
| Bachelor's degree or higher | 39.2% | 17.6% |
| Unemployment rate | 4.6% | 19.7% |
Trends (ACS 5-year, 2019–2023)
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| Population | 4,060 → 5,001 (+23.2%) | 438 → 573 (+30.8%) |
| Median household income | $75,913 → $110,015 (+44.9%) | $66,304 → $120,324 (+81.5%) |
| Median home value | $159,700 → $244,900 (+53.4%) | $153,500 → $161,500 (+5.2%) |
| Median gross rent | $810 → $1,413 (+74.4%) | — |
ZIP 21830
4,0605,001
$75,913$110,015
$159,700$244,900
$810$1,413
ZIP 21840
438573
$66,304$120,324
$153,500$161,500
Age & race/ethnicity
Age distribution (share)
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| Under 5 | 4.3% | 10.1% |
| 5 to 17 | 19.7% | 17.6% |
| 18 to 24 | 15.3% | 0.0% |
| 25 to 34 | 7.5% | 7.3% |
| 35 to 44 | 10.8% | 7.2% |
| 45 to 54 | 16.1% | 14.0% |
| 55 to 64 | 12.8% | 14.7% |
| 65 to 74 | 7.4% | 11.7% |
| 75 and over | 6.3% | 17.5% |
Race & ethnicity (share)
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| White (non-Hispanic) | 80.3% | 74.0% |
| Black or African American | 13.6% | 0.0% |
| American Indian & Alaska Native | 0.1% | 0.0% |
| Asian | 0.2% | 0.0% |
| Native Hawaiian & Pacific Islander | 0.3% | 0.0% |
| Some other race | 0.5% | 0.0% |
| Two or more races | 2.4% | 26.0% |
| Hispanic or Latino | 2.7% | 0.0% |
Educational attainment (age 25+)
Share of adults 25+
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| No high school diploma | 3.1% | 0.0% |
| High school graduate | 26.7% | 51.0% |
| Some college or associate's | 31.1% | 31.4% |
| Bachelor's degree | 28.3% | 14.0% |
| Graduate or professional degree | 10.9% | 3.6% |
Commute to work
How workers get to work (share)
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| Drove alone | 79.5% | 100.0% |
| Carpooled | 3.9% | 0.0% |
| Public transit | 0.5% | 0.0% |
| Walked | 0.0% | 0.0% |
| Bicycle | 0.0% | 0.0% |
| Worked from home | 14.9% | 0.0% |
| Other means | 1.2% | 0.0% |
Housing
Units in structure (share)
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| 1-unit, detached | 91.8% | 100.0% |
| 1-unit, attached | 1.2% | 0.0% |
| 2 to 4 units | 0.0% | 0.0% |
| 5 to 19 units | 1.0% | 0.0% |
| 20 or more units | 0.4% | 0.0% |
| Mobile home & other | 5.6% | 0.0% |
Poverty & households
| ZIP 21830 | ZIP 21840 | |
|---|---|---|
| Poverty rate | 6.4% | 0.0% |
| Average household size | 2.77 | 2.97 |
| Mean commute (minutes) | 26 | — |
| Median year structure built | 1998 | 1962 |