Population 8,725 · Census ACS 2020–24
Choose a measure to map it.Tap a measure to map it. Swipe the row for more. Arrows show the change since 2006–10.
Median age by neighborhoodHistory and comparison ↓︎
Younger residents
Older residents
Colorblind friendly
off
More maps of ZIP 21770: Best Neighborhoods · Walk Grade · Household income · Home prices · Race · Politics · Traffic noise · Internet
Population and households in ZIP 21770
Household size in ZIP 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.10 | 2.73 | 2.68 | 2.68 |
| 2010–14 | 2.83 | 2.82 | 2.73 | 2.73 |
| 2015–19 | 2.86 | 2.86 | 2.74 | 2.71 |
| 2020–24 | 3.23 | 2.77 | 2.68 | 2.65 |
| Change | +0.13 | +0.04 | +0.01 | −0.03 |
Households in ZIP 21770 are large by national standards, averaging 3.23 people against 2.65 for the U.S. That usually means more families with children at home. Since 2006–10, household size has climbed from 3.10, even as the national average fell. Only 14 of the 240 Maryland ZIP codes with 5,000+ people have larger households.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 43.8 | 37.0 | 38.5 | 37.7 |
| 2010–14 | 46.3 | 37.6 | 39.3 | 38.6 |
| 2015–19 | 44.2 | 38.5 | 40.2 | 39.6 |
| 2020–24 | 41.5 | 39.2 | 40.6 | 40.1 |
| Change | −2.3 | +2.2 | +2.1 | +2.3 |
Half of the people in ZIP 21770 are younger than 41.5 and half are older, close to the national median of 40.1. The population here is older than in the Washington area overall, where the median age is 39.2. Since 2006–10, the median age has dropped from 43.8, even as the national median rose.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 4.9% | 11.3% | 12.5% | 12.3% |
| 2010–14 | 1.9% | 11.3% | 12.6% | 12.3% |
| 2015–19 | 4.4% | 10.4% | 11.7% | 11.6% |
| 2020–24 | 9.2% | 10.4% | 11.7% | 11.6% |
| Change | +4.4 pts | −0.9 pts | −0.9 pts | −0.6 pts |
Single-parent households are less common in ZIP 21770 than nationally: 9.2%, against 11.6%. Since 2006–10, the single-parent share has risen 4.4 points, even as the national share fell.
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 21770
Renters in ZIP 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 4.1% | 34.0% | 31.0% | 33.3% |
| 2010–14 | 6.9% | 36.6% | 32.9% | 35.6% |
| 2015–19 | 4.6% | 36.8% | 33.1% | 36.0% |
| 2020–24 | 2.3% | 36.3% | 32.4% | 34.8% |
| Change | −1.8 pts | +2.3 pts | +1.4 pts | +1.5 pts |
ZIP 21770 is overwhelmingly a place of homeowners: only 2.3% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Since 2006–10, the renter share has fallen 1.8 points, even as the national share rose. No other Maryland ZIP code with 5,000+ people has a lower share of renters.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.8% | 8.7% | 9.0% | 11.4% |
| 2010–14 | 3.3% | 7.3% | 8.9% | 11.4% |
| 2015–19 | 5.3% | 6.6% | 8.9% | 11.1% |
| 2020–24 | 0.8% | 5.9% | 7.1% | 9.6% |
| Change | −2.0 pts | −2.8 pts | −1.9 pts | −1.8 pts |
Only 0.8% of homes in ZIP 21770 are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Since 2006–10, vacancy has fallen 2.0 points, as it has nationally. Only one other Maryland ZIP code with 5,000+ people has a lower vacancy rate.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 1979 | 1977 | 1974 | 1974 |
| 2010–14 | 1980 | 1978 | 1975 | 1975 |
| 2015–19 | 1983 | 1979 | 1976 | 1977 |
| 2020–24 | 1993 | 1982 | 1978 | 1980 |
| Change | +14 | +6 | +4 | +6 |
Much of the housing in ZIP 21770 is relatively new: half of its homes were built after 1993, compared with 1980 for the U.S. as a whole. The median year built has moved up from 1979 in 2006–10, a sign of steady new building. Newer construction is concentrated in the west, while the southeast has the oldest housing.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,158 | $1,470 | $1,249 | $965 |
| 2010–14 | $1,910 | $1,583 | $1,363 | $1,040 |
| 2015–19 | $1,738 | $1,907 | $1,576 | $1,213 |
| 2020–24 | $1,812 | $2,236 | $1,869 | $1,571 |
| Change | +$654 | +$766 | +$620 | +$606 |
Rent in ZIP 21770 runs $1,812 a month at the median, utilities included, above the U.S. median of $1,571. Locally, though, rents here are lower than in the wider Washington area ($2,236). Rent has climbed $654 a month since 2006–10, up 56%, a slower climb than the nation's. Rent takes 27.8% of the typical renter's income, just 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 21770
Bachelor's degrees in ZIP 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 34.8% | 46.6% | 36.3% | 28.4% |
| 2010–14 | 41.2% | 48.2% | 37.7% | 29.6% |
| 2015–19 | 45.2% | 51.0% | 40.5% | 32.1% |
| 2020–24 | 52.5% | 53.9% | 43.4% | 35.6% |
| Change | +17.7 pts | +7.3 pts | +7.1 pts | +7.2 pts |
ZIP 21770 is highly educated: just over half of adults 25 and older (52.5%) hold at least a bachelor's degree, far above the national share of 35.6%. The share with a degree is up 17.7 points from 2006–10, in line with the national trend. College graduates are most concentrated in the west and least in the southeast.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 93.0% | 89.4% | 88.0% | 84.9% |
| 2010–14 | 93.5% | 90.2% | 89.1% | 86.1% |
| 2015–19 | 93.8% | 90.8% | 90.2% | 87.7% |
| 2020–24 | 97.8% | 91.2% | 90.9% | 89.3% |
| Change | +4.8 pts | +1.7 pts | +2.9 pts | +4.3 pts |
Finishing high school is nearly universal in ZIP 21770: 97.8% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. Since 2006–10, the share with a diploma has risen 4.8 points, mirroring the country. Of the 240 Maryland ZIP codes with 5,000+ people, only 16 have a higher share of high school graduates.
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 21770
| Period | ZIP 21770 | Washington area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.3% | 5.9% | 6.5% | 8.1% |
| 2010–14 | 4.9% | 6.9% | 8.1% | 9.4% |
| 2015–19 | 3.7% | 4.7% | 5.1% | 5.6% |
| 2020–24 | 2.3% | 4.8% | 5.0% | 5.4% |
| Change | −1.0 pts | −1.1 pts | −1.5 pts | −2.7 pts |
The job market in ZIP 21770 has been strong: just 2.3% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment is down 1.0 points from 2006–10, as it has nationally. 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 21770 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 21770 | 3.23 | 41.5 | 9.2% | 2.3% | 0.8% | 1993 | $1,812 | 52.5% | 97.8% | 2.3% |
| ZIP 21754 | 3.13 | 37.8 | 5.0% | 7.0% | 4.0% | 2006 | $2,111 | 62.7% | 98.2% | 1.9% |
| ZIP 21774 | 3.04 | 35.9 | 6.0% | 6.8% | 3.2% | 2002 | $2,182 | 61.3% | 97.0% | 2.3% |
| ZIP 21704 | 3.16 | 39.5 | 11.0% | 18.1% | 4.5% | 2007 | $2,356 | 59.2% | 95.6% | 3.0% |
| ZIP 20872 | 3.01 | 43.3 | 8.2% | 9.7% | 4.2% | 1981 | $1,832 | 43.3% | 89.6% | 2.9% |
| ZIP 21771 | 2.97 | 42.5 | 8.0% | 5.7% | 5.3% | 1988 | $2,232 | 48.5% | 95.5% | 4.6% |
| ZIP 20871 | 3.24 | 37.8 | 11.4% | 9.6% | 1.2% | 2007 | $2,583 | 66.8% | 94.9% | 3.9% |
| ZIP 21701 | 2.35 | 40.5 | 10.3% | 33.2% | 5.0% | 1980 | $1,777 | 51.0% | 93.7% | 3.6% |
| ZIP 21762 | 3.15 | 39.6 | 23.7% | 2.5% | 5.6% | 1975 | $2,380 | 47.2% | 98.6% | 1.7% |
| ZIP 21717 | 2.62 | 49.5 | 2.4% | 8.9% | 6.1% | 1982 | $2,298 | 33.6% | 96.8% | 0.0% |
| ZIP 20882 | 2.96 | 47.1 | 4.5% | 6.2% | 2.0% | 1985 | $1,581 | 59.6% | 94.6% | 4.5% |
All figures 2020–24.
Zip codes with similar populations: 06787, CT · 74044, OK · 15537, PA · 13732, NY · 77486, TX · 63070, MO · 08758, NJ · 24091, VA · 08530, NJ · 07924, 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 21770. 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.
No other site shows detail at this level for free. We are able to keep this site free by receiving a small commission from the referring links on this page. Please share or cite this page if you aren’t able to otherwise support our work.