Population 867 · Census ACS 2020–24
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Population and households in ZIP 21821
Household size in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 2.08 | 2.68 | 2.68 |
| 2010–14 | 1.95 | 2.73 | 2.73 |
| 2015–19 | 2.19 | 2.74 | 2.71 |
| 2020–24 | 2.02 | 2.68 | 2.65 |
| Change | −0.06 | +0.01 | −0.03 |
ZIP 21821 is a place of small households, averaging 2.02 people against 2.65 for the U.S., which points to many singles, couples and roommates and relatively few children.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 52.4 | 38.5 | 37.7 |
| 2010–14 | 54.7 | 39.3 | 38.6 |
| 2015–19 | 57.1 | 40.2 | 39.6 |
| 2020–24 | 50.3 | 40.6 | 40.1 |
| Change | −2.1 | +2.1 | +2.3 |
ZIP 21821 skews older: half of its residents are older than 50.3, well above the national median of 40.1. That usually means more empty nesters and retirees, and fewer young families. Since 2006–10, the median age has dropped from 52.4, but in a place this small, survey estimates can swing a lot from one release to the next.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 6.0% | 12.5% | 12.3% |
| 2010–14 | 10.8% | 12.6% | 12.3% |
| 2015–19 | 4.8% | 11.7% | 11.6% |
| 2020–24 | 6.4% | 11.7% | 11.6% |
| Change | +0.4 pts | −0.9 pts | −0.6 pts |
Single parents head only 6.4% of households in ZIP 21821, well below the national share of 11.6%.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in ZIP 21821
Renters in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 18.0% | 31.0% | 33.3% |
| 2010–14 | 14.2% | 32.9% | 35.6% |
| 2015–19 | 11.5% | 33.1% | 36.0% |
| 2020–24 | 19.8% | 32.4% | 34.8% |
| Change | +1.8 pts | +1.4 pts | +1.5 pts |
ZIP 21821 is largely a place of homeowners: only 19.8% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Nearly six in ten owners (56.6%) have paid off their mortgages, well above the national share of 39.8%.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 39.8% | 9.0% | 11.4% |
| 2010–14 | 36.0% | 8.9% | 11.4% |
| 2015–19 | 44.9% | 8.9% | 11.1% |
| 2020–24 | 36.1% | 7.1% | 9.6% |
| Change | −3.7 pts | −1.9 pts | −1.8 pts |
Vacancy is high in ZIP 21821: 36.1% of homes are empty, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 1957 | 1974 | 1974 |
| 2010–14 | 1966 | 1975 | 1975 |
| 2015–19 | 1962 | 1976 | 1977 |
| 2020–24 | 1967 | 1978 | 1980 |
| Change | +10 | +4 | +6 |
ZIP 21821 is a place of older homes: half were built before 1967, while the national median is 1980. That means established neighborhoods, and more houses that may need updating.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | $1,061 | $1,249 | $965 |
| 2010–14 | $778 | $1,363 | $1,040 |
| 2015–19 | $910 | $1,576 | $1,213 |
| 2020–24 | $1,297 | $1,869 | $1,571 |
| Change | +$236 | +$620 | +$606 |
Rent in ZIP 21821 runs $1,297 a month at the median, utilities included, below the U.S. median of $1,571. Rent takes 32.0% of the typical renter's income, just over the 30% mark often used to define affordable rent.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in ZIP 21821
Bachelor's degrees in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 13.6% | 36.3% | 28.4% |
| 2010–14 | 12.9% | 37.7% | 29.6% |
| 2015–19 | 16.0% | 40.5% | 32.1% |
| 2020–24 | 9.9% | 43.4% | 35.6% |
| Change | −3.7 pts | +7.1 pts | +7.2 pts |
Fewer adults in ZIP 21821 have a four-year degree than in the country as a whole: 9.9%, against 35.6% nationally.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 77.9% | 88.0% | 84.9% |
| 2010–14 | 84.1% | 89.1% | 86.1% |
| 2015–19 | 81.8% | 90.2% | 87.7% |
| 2020–24 | 80.9% | 90.9% | 89.3% |
| Change | +3.0 pts | +2.9 pts | +4.3 pts |
Nearly one in five adults in ZIP 21821 never finished high school, well above the national share: only 80.9% have a diploma or equivalent, against 89.3% nationally.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in ZIP 21821
| Period | ZIP 21821 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 2.5% | 6.5% | 8.1% |
| 2010–14 | 12.5% | 8.1% | 9.4% |
| 2015–19 | 4.6% | 5.1% | 5.6% |
| 2020–24 | 6.3% | 5.0% | 5.4% |
| Change | +3.8 pts | −1.5 pts | −2.7 pts |
Jobs have been a little harder to find in ZIP 21821 than nationally: unemployment was 6.3%, against 5.4%. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
ZIP 21821 compared with nearby ZIP codes
| ZIP code | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| ZIP 21821 | 2.02 | 50.3 | 6.4% | 19.8% | 36.1% | 1967 | $1,297 | 9.9% | 80.9% | 6.3% |
| ZIP 21840 | 2.66 | 48.9 | 16.0% | 16.0% | 44.5% | 1962 | $1,199 | 20.2% | 100.0% | 15.7% |
| ZIP 21627 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
| ZIP 21867 | 2.16 | 55.4 | 5.4% | 15.8% | 10.4% | 1984 | $980 | 22.7% | 82.5% | 23.9% |
| ZIP 21814 | 2.66 | 48.9 | 16.0% | 16.0% | 44.5% | 1962 | $1,199 | 20.2% | 100.0% | 15.7% |
| ZIP 21672 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
| ZIP 21675 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
| ZIP 21871 | 2.33 | 52.5 | 4.3% | 11.6% | 21.4% | 1977 | $972 | 14.9% | 86.5% | 11.8% |
| ZIP 21890 | 2.08 | 35.9 | 2.8% | 0.0% | 10.9% | 1959 | $980 | 2.4% | 71.3% | 31.2% |
| ZIP 21853 | 2.47 | 34.8 | 15.7% | 35.7% | 25.5% | 1992 | $1,156 | 27.1% | 93.1% | 6.6% |
| ZIP 21838 | 2.49 | 48.5 | 5.9% | 11.3% | 18.4% | 1977 | $944 | 18.1% | 93.5% | 3.9% |
All figures 2020–24.
Zip codes with similar populations: 12950, NY · 84082, UT · 21723, MD · 83114, WY · 87830, NM · 16692, PA · 92368, CA · 23413, VA · 12970, NY · 08511, NJ
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up ZIP 21821. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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