Population 365 · 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 21840: Best Neighborhoods · Walk Grade · Household income · Home prices · Race · Politics · Traffic noise · Internet
Population and households in ZIP 21840
Household size in ZIP 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 2.26 | 2.68 | 2.68 |
| 2010–14 | 2.46 | 2.73 | 2.73 |
| 2015–19 | 2.54 | 2.74 | 2.71 |
| 2020–24 | 2.66 | 2.68 | 2.65 |
| Change | +0.40 | +0.01 | −0.03 |
Households in ZIP 21840 average 2.66 people, about the same as the country as a whole (2.65). Since 2006–10, household size has climbed from 2.26, 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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 50.8 | 38.5 | 37.7 |
| 2010–14 | 52.7 | 39.3 | 38.6 |
| 2015–19 | 49.5 | 40.2 | 39.6 |
| 2020–24 | 48.9 | 40.6 | 40.1 |
| Change | −1.9 | +2.1 | +2.3 |
ZIP 21840 skews older: half of its residents are older than 48.9, 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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 8.7% | 12.5% | 12.3% |
| 2010–14 | 3.0% | 12.6% | 12.3% |
| 2015–19 | 4.8% | 11.7% | 11.6% |
| 2020–24 | 16.0% | 11.7% | 11.6% |
| Change | +7.3 pts | −0.9 pts | −0.6 pts |
Single-parent households are common in ZIP 21840: 16.0% of all households, against 11.6% 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 21840
Renters in ZIP 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 11.6% | 31.0% | 33.3% |
| 2010–14 | 34.6% | 32.9% | 35.6% |
| 2015–19 | 12.8% | 33.1% | 36.0% |
| 2020–24 | 16.0% | 32.4% | 34.8% |
| Change | +4.4 pts | +1.4 pts | +1.5 pts |
Only 16.0% of households in ZIP 21840 rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. About four in ten owners (39.1%) have paid off their mortgages, about the same as nationally.
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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 33.9% | 9.0% | 11.4% |
| 2010–14 | 28.9% | 8.9% | 11.4% |
| 2015–19 | 39.4% | 8.9% | 11.1% |
| 2020–24 | 44.5% | 7.1% | 9.6% |
| Change | +10.6 pts | −1.9 pts | −1.8 pts |
Vacant homes make up 44.5% of the housing in ZIP 21840, 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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 1963 | 1974 | 1974 |
| 2010–14 | 1962 | 1975 | 1975 |
| 2015–19 | 1959 | 1976 | 1977 |
| 2020–24 | 1962 | 1978 | 1980 |
| Change | −1 | +4 | +6 |
ZIP 21840 is a place of older homes: half were built before 1962, 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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | $923 | $1,249 | $965 |
| 2010–14 | $953 | $1,363 | $1,040 |
| 2015–19 | $1,243 | $1,576 | $1,213 |
| 2020–24 | $1,199 | $1,869 | $1,571 |
| Change | +$276 | +$620 | +$606 |
A typical rental in ZIP 21840 costs $1,199 a month with utilities, well below the national median of $1,571. Rent takes 14.0% 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 21840
Bachelor's degrees in ZIP 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 33.9% | 36.3% | 28.4% |
| 2010–14 | 24.9% | 37.7% | 29.6% |
| 2015–19 | 20.5% | 40.5% | 32.1% |
| 2020–24 | 20.2% | 43.4% | 35.6% |
| Change | −13.7 pts | +7.1 pts | +7.2 pts |
College degrees are relatively uncommon in ZIP 21840: 20.2% 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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 96.5% | 88.0% | 84.9% |
| 2010–14 | 80.4% | 89.1% | 86.1% |
| 2015–19 | 96.1% | 90.2% | 87.7% |
| 2020–24 | 100.0% | 90.9% | 89.3% |
| Change | +3.5 pts | +2.9 pts | +4.3 pts |
Finishing high school is nearly universal in ZIP 21840: 100.0% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%.
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 21840
| Period | ZIP 21840 | Maryland | U.S. |
|---|---|---|---|
| 2006–10 | 2.7% | 6.5% | 8.1% |
| 2010–14 | 27.7% | 8.1% | 9.4% |
| 2015–19 | 7.5% | 5.1% | 5.6% |
| 2020–24 | 15.7% | 5.0% | 5.4% |
| Change | +13.0 pts | −1.5 pts | −2.7 pts |
Finding work has been harder in ZIP 21840: 15.7% of the labor force was out of work and looking, well above the national rate of 5.4%. 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 21840 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 21840 | 2.66 | 48.9 | 16.0% | 16.0% | 44.5% | 1962 | $1,199 | 20.2% | 100.0% | 15.7% |
| ZIP 21814 | 2.66 | 48.9 | 16.0% | 16.0% | 44.5% | 1962 | $1,199 | 20.2% | 100.0% | 15.7% |
| ZIP 21865 | 2.57 | 51.2 | 17.8% | 16.7% | 31.0% | 1971 | $1,199 | 19.0% | 97.8% | 16.0% |
| ZIP 21821 | 2.02 | 50.3 | 6.4% | 19.8% | 36.1% | 1967 | $1,297 | 9.9% | 80.9% | 6.3% |
| ZIP 21627 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
| ZIP 21672 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
| ZIP 21856 | 2.47 | 52.2 | 18.3% | 15.4% | 8.2% | 1988 | $1,199 | 23.1% | 91.4% | 14.2% |
| ZIP 21675 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
| ZIP 21853 | 2.47 | 34.8 | 15.7% | 35.7% | 25.5% | 1992 | $1,156 | 27.1% | 93.1% | 6.6% |
| ZIP 21810 | 2.23 | 56.5 | 2.5% | 4.6% | 1.9% | 1991 | $1,199 | 49.5% | 96.2% | 3.4% |
| ZIP 21626 | 2.29 | 57.8 | 2.0% | 6.9% | 42.9% | 1950 | $1,330 | 26.0% | 93.5% | 0.0% |
All figures 2020–24.
Zip codes with similar populations: 02672, MA · 04359, ME · 04475, ME · 04657, ME · 04766, ME · 12955, NY · 05442, VT · 05730, VT · 08023, NJ · 10020, NY
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 21840. 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.