Population 1,671 · Census ACS 2020–24
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Population and households in ZIP 21557
Household size in ZIP 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 2.65 | 2.68 | 2.68 |
| 2010–14 | 2.56 | 2.73 | 2.73 |
| 2015–19 | 2.34 | 2.74 | 2.71 |
| 2020–24 | 2.21 | 2.68 | 2.65 |
| Change | −0.44 | +0.01 | −0.03 |
Households in ZIP 21557 are small: just 2.21 people on average, compared with 2.65 nationally. That is typical of places where many people live alone or as couples, and fewer have children at home. Since 2006–10, household size has dropped from 2.65, but in a place this small, much of that may be survey noise rather than real change.
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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 40.2 | 38.5 | 37.7 |
| 2010–14 | 41.8 | 39.3 | 38.6 |
| 2015–19 | 43.9 | 40.2 | 39.6 |
| 2020–24 | 45.3 | 40.6 | 40.1 |
| Change | +5.1 | +2.1 | +2.3 |
ZIP 21557 skews older: half of its residents are older than 45.3, well above the national median of 40.1. That usually means more empty nesters and retirees, and fewer young families.
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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 25.9% | 12.5% | 12.3% |
| 2010–14 | 16.7% | 12.6% | 12.3% |
| 2015–19 | 10.8% | 11.7% | 11.6% |
| 2020–24 | 14.1% | 11.7% | 11.6% |
| Change | −11.8 pts | −0.9 pts | −0.6 pts |
Single parents head about one in seven households in ZIP 21557 (14.1%), above 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 21557
Renters in ZIP 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 16.0% | 31.0% | 33.3% |
| 2010–14 | 12.7% | 32.9% | 35.6% |
| 2015–19 | 10.7% | 33.1% | 36.0% |
| 2020–24 | 23.9% | 32.4% | 34.8% |
| Change | +7.9 pts | +1.4 pts | +1.5 pts |
ZIP 21557 is largely a place of homeowners: only 23.9% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Among homeowners, 53.6% have no mortgage at all, 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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 7.1% | 9.0% | 11.4% |
| 2010–14 | 9.8% | 8.9% | 11.4% |
| 2015–19 | 8.6% | 8.9% | 11.1% |
| 2020–24 | 14.5% | 7.1% | 9.6% |
| Change | +7.3 pts | −1.9 pts | −1.8 pts |
Vacant homes make up 14.5% of the housing in ZIP 21557, 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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 1967 | 1974 | 1974 |
| 2010–14 | 1971 | 1975 | 1975 |
| 2015–19 | 1966 | 1976 | 1977 |
| 2020–24 | 1964 | 1978 | 1980 |
| Change | −3 | +4 | +6 |
ZIP 21557 is a place of older homes: half were built before 1964, 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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | $605 | $1,249 | $965 |
| 2010–14 | $401 | $1,363 | $1,040 |
| 2015–19 | $714 | $1,576 | $1,213 |
| 2020–24 | $706 | $1,869 | $1,571 |
| Change | +$101 | +$620 | +$606 |
The median renter in ZIP 21557 pays $706 a month for rent and utilities, well below the national median of $1,571. Rent takes 20.0% of the typical renter's income, comfortably under 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 21557
Bachelor's degrees in ZIP 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 11.5% | 36.3% | 28.4% |
| 2010–14 | 12.1% | 37.7% | 29.6% |
| 2015–19 | 9.1% | 40.5% | 32.1% |
| 2020–24 | 16.9% | 43.4% | 35.6% |
| Change | +5.4 pts | +7.1 pts | +7.2 pts |
College degrees are relatively uncommon in ZIP 21557: 16.9% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%.
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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 83.7% | 88.0% | 84.9% |
| 2010–14 | 90.3% | 89.1% | 86.1% |
| 2015–19 | 93.2% | 90.2% | 87.7% |
| 2020–24 | 85.9% | 90.9% | 89.3% |
| Change | +2.2 pts | +2.9 pts | +4.3 pts |
About one in seven adults in ZIP 21557 never finished high school, more than nationally: 85.9% have a diploma or equivalent, against 89.3% across the U.S.
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 21557
| Period | ZIP 21557 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 4.1% | 6.5% | 8.1% |
| 2010–14 | 6.4% | 8.1% | 9.4% |
| 2015–19 | 11.1% | 5.1% | 5.6% |
| 2020–24 | 0.0% | 5.0% | 5.4% |
| Change | −4.0 pts | −1.5 pts | −2.7 pts |
The survey found almost no one in ZIP 21557 out of work and looking, against 5.4% of the labor force nationally. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current 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 21557 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 21557 | 2.21 | 45.3 | 14.1% | 23.9% | 14.5% | 1964 | $706 | 16.9% | 85.9% | 0.0% |
| ZIP 21521 | 2.66 | 41.2 | 12.9% | 18.9% | 14.5% | 1951 | $854 | 7.6% | 94.0% | 6.5% |
| ZIP 21542 | 2.96 | 37.0 | 14.3% | 25.1% | 3.8% | 1964 | $693 | 16.4% | 95.7% | 1.5% |
| ZIP 26726 | 2.35 | 43.3 | 9.3% | 23.6% | 14.3% | 1974 | $760 | 23.3% | 93.8% | 5.6% |
| ZIP 21562 | 2.42 | 43.5 | 17.4% | 25.6% | 19.2% | 1957 | $637 | 14.1% | 90.9% | 1.0% |
| ZIP 21539 | 2.22 | 50.3 | 6.7% | 31.1% | 20.0% | 1957 | $903 | 19.5% | 89.0% | 5.5% |
| ZIP 26750 | 2.63 | 42.1 | 9.6% | 28.8% | 26.1% | 1960 | $493 | 12.1% | 89.4% | 10.3% |
| ZIP 26719 | 2.25 | 48.4 | 8.9% | 14.2% | 11.4% | 1979 | $841 | 20.7% | 91.9% | 4.1% |
| ZIP 21540 | 2.00 | 52.7 | 16.1% | 46.4% | 22.3% | 1960 | $515 | 14.0% | 83.1% | 1.7% |
| ZIP 26753 | 2.36 | 44.3 | 11.4% | 18.1% | 8.7% | 1988 | $1,002 | 31.9% | 96.9% | 8.4% |
| ZIP 21523 | 2.47 | 39.6 | 2.2% | 6.3% | 12.6% | 1970 | $764 | 19.0% | 82.3% | 4.1% |
All figures 2020–24.
Zip codes with similar populations: 04911, ME · 05473, VT · 93206, CA · 87455, NM · 06763, CT · 86054, AZ · 12491, NY · 13112, NY · 67756, KS · 61937, IL
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 21557. 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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