Population 7,524 · Census ACS 2020–24
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Population and households in ZIP 21851
Household size in ZIP 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 2.44 | 2.68 | 2.68 |
| 2010–14 | 2.70 | 2.73 | 2.73 |
| 2015–19 | 2.41 | 2.74 | 2.71 |
| 2020–24 | 2.35 | 2.68 | 2.65 |
| Change | −0.09 | +0.01 | −0.03 |
ZIP 21851 is a place of small households, averaging 2.35 people against 2.65 for the U.S., which points to many singles, couples and roommates and relatively few children. Household size has dropped from 2.44 in 2006–10, as it has nationally. The biggest households, usually families with children, are concentrated in the southwest.
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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 39.2 | 38.5 | 37.7 |
| 2010–14 | 38.8 | 39.3 | 38.6 |
| 2015–19 | 45.0 | 40.2 | 39.6 |
| 2020–24 | 43.6 | 40.6 | 40.1 |
| Change | +4.4 | +2.1 | +2.3 |
The median resident of ZIP 21851 is 43.6 years old, older than the national median of 40.1. Since 2006–10, the median age has climbed from 39.2, mirroring the country. Residents skew youngest in the center and oldest in the west.
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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 16.0% | 12.5% | 12.3% |
| 2010–14 | 19.0% | 12.6% | 12.3% |
| 2015–19 | 12.9% | 11.7% | 11.6% |
| 2020–24 | 12.1% | 11.7% | 11.6% |
| Change | −4.0 pts | −0.9 pts | −0.6 pts |
Single-parent households are about as common in ZIP 21851 as they are nationally: 12.1%, against 11.6%. The single-parent share has fallen 4.0 points since 2006–10, a much bigger shift than nationally.
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 21851
Renters in ZIP 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 36.1% | 31.0% | 33.3% |
| 2010–14 | 35.7% | 32.9% | 35.6% |
| 2015–19 | 38.6% | 33.1% | 36.0% |
| 2020–24 | 34.0% | 32.4% | 34.8% |
| Change | −2.0 pts | +1.4 pts | +1.5 pts |
Renting in ZIP 21851 is about as common as it is nationally: 34.0% of households rent, against 34.8%. Among homeowners, 46.7% have no mortgage at all, above the national share of 39.8%. Renting is most common in the center and least common in the northwest. The renter share is down 2.0 points from 2006–10, even as the national share rose.
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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 14.0% | 9.0% | 11.4% |
| 2010–14 | 17.0% | 8.9% | 11.4% |
| 2015–19 | 18.1% | 8.9% | 11.1% |
| 2020–24 | 14.9% | 7.1% | 9.6% |
| Change | +0.9 pts | −1.9 pts | −1.8 pts |
Vacant homes make up 14.9% of the housing in ZIP 21851, 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. Since 2006–10, vacancy has edged up 0.9 points, even as the national rate fell.
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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 1968 | 1974 | 1974 |
| 2010–14 | 1972 | 1975 | 1975 |
| 2015–19 | 1967 | 1976 | 1977 |
| 2020–24 | 1973 | 1978 | 1980 |
| Change | +5 | +4 | +6 |
Homes in ZIP 21851 run older than the national norm, with a median build year of 1973 against 1980. The median year built has moved up from 1968 in 2006–10, a sign of steady new building.
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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | $597 | $1,249 | $965 |
| 2010–14 | $715 | $1,363 | $1,040 |
| 2015–19 | $871 | $1,576 | $1,213 |
| 2020–24 | $832 | $1,869 | $1,571 |
| Change | +$236 | +$620 | +$606 |
Rent in ZIP 21851 runs $832 a month at the median, utilities included, well below the U.S. median of $1,571. Rents are up $236 a month from 2006–10, a 39% rise, a slower climb than the nation's. Rent takes 34.1% of the typical renter's income, well over the 30% mark often used to define affordable rent, so many renters here are stretched. Only three of the 240 Maryland ZIP codes with 5,000+ people have lower rents.
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 21851
Bachelor's degrees in ZIP 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 15.9% | 36.3% | 28.4% |
| 2010–14 | 20.2% | 37.7% | 29.6% |
| 2015–19 | 21.5% | 40.5% | 32.1% |
| 2020–24 | 21.6% | 43.4% | 35.6% |
| Change | +5.6 pts | +7.1 pts | +7.2 pts |
Fewer adults in ZIP 21851 have a four-year degree than in the country as a whole: 21.6%, against 35.6% nationally. The share with a degree is up 5.6 points from 2006–10, in line with the national trend. Of the 240 Maryland ZIP codes with 5,000+ people, only 18 have a lower share of college graduates.
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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 77.9% | 88.0% | 84.9% |
| 2010–14 | 80.7% | 89.1% | 86.1% |
| 2015–19 | 86.9% | 90.2% | 87.7% |
| 2020–24 | 92.0% | 90.9% | 89.3% |
| Change | +14.1 pts | +2.9 pts | +4.3 pts |
High school completion in ZIP 21851 is a bit above the national rate: 92.0% of adults have a diploma or equivalent, against 89.3%. That is in line with the rest of Maryland. The share with a diploma is up 14.1 points from 2006–10, a much bigger shift than 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 21851
| Period | ZIP 21851 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 10.2% | 6.5% | 8.1% |
| 2010–14 | 20.6% | 8.1% | 9.4% |
| 2015–19 | 7.4% | 5.1% | 5.6% |
| 2020–24 | 8.9% | 5.0% | 5.4% |
| Change | −1.2 pts | −1.5 pts | −2.7 pts |
Finding work has been harder in ZIP 21851: 8.9% of the labor force was out of work and looking, well above the national rate of 5.4%. Of the 240 Maryland ZIP codes with 5,000+ people, only seven have higher unemployment. 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 21851 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 21851 | 2.35 | 43.6 | 12.1% | 34.0% | 14.9% | 1973 | $832 | 21.6% | 92.0% | 8.9% |
| ZIP 21864 | 2.20 | 47.9 | 14.3% | 14.7% | 13.0% | 1974 | $791 | 15.5% | 91.0% | 7.1% |
| ZIP 23415 | 2.02 | 44.7 | 9.1% | 51.2% | 15.0% | 1984 | $921 | 7.7% | 80.0% | 4.5% |
| ZIP 23488 | 1.99 | 41.0 | 13.2% | 50.6% | 20.8% | 1978 | $1,048 | 4.9% | 70.9% | 3.9% |
| ZIP 23356 | 2.10 | 61.4 | 0.9% | 2.8% | 62.9% | 2002 | $848 | 35.2% | 99.6% | 1.2% |
| ZIP 21829 | 2.08 | 54.7 | 11.3% | 17.0% | 13.2% | 1967 | $1,031 | 18.9% | 92.8% | 7.7% |
| ZIP 23395 | 2.03 | 58.6 | 1.3% | 13.9% | 50.8% | 1999 | $841 | 27.8% | 96.7% | 3.7% |
| ZIP 23416 | 2.45 | 51.0 | 8.8% | 33.9% | 19.7% | 1981 | $1,165 | 19.5% | 81.3% | 4.1% |
| 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 23337 | 2.34 | 52.8 | 5.5% | 30.2% | 16.9% | 1984 | $1,029 | 17.4% | 87.8% | 4.9% |
All figures 2020–24.
Zip codes with similar populations: 98826, WA · 87035, NM · 14141, NY · 12540, NY · 11363, NY · 10996, NY · 08809, NJ · 07041, NJ · 06333, CT · 06035, CT
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 21851. 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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