Population 15,081 · 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 21231: Best Neighborhoods · Walk Grade · Household income · Home prices · Race · Politics · Traffic noise · Internet
Population and households in ZIP 21231
Household size in ZIP 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.22 | 2.61 | 2.68 | 2.68 |
| 2010–14 | 2.21 | 2.65 | 2.73 | 2.73 |
| 2015–19 | 2.09 | 2.65 | 2.74 | 2.71 |
| 2020–24 | 1.84 | 2.59 | 2.68 | 2.65 |
| Change | −0.38 | −0.02 | +0.01 | −0.03 |
Households in ZIP 21231 are small: just 1.84 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 2.22, a much bigger shift than nationally. Only three of the 240 Maryland ZIP codes with 5,000+ people have smaller 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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 32.7 | 38.7 | 38.5 | 37.7 |
| 2010–14 | 33.0 | 39.5 | 39.3 | 38.6 |
| 2015–19 | 33.2 | 40.2 | 40.2 | 39.6 |
| 2020–24 | 33.4 | 40.3 | 40.6 | 40.1 |
| Change | +0.7 | +1.6 | +2.1 | +2.3 |
With a median age of just 33.4, ZIP 21231 is far younger than the country as a whole (40.1), a population that tilts toward young adults, many of them living alone or as couples. The median age has crept up from 32.7 in 2006–10, a smaller shift than nationally. Of the 240 Maryland ZIP codes with 5,000+ people, only seven are younger.
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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 11.8% | 12.6% | 12.5% | 12.3% |
| 2010–14 | 13.8% | 12.3% | 12.6% | 12.3% |
| 2015–19 | 11.4% | 11.6% | 11.7% | 11.6% |
| 2020–24 | 7.1% | 11.5% | 11.7% | 11.6% |
| Change | −4.8 pts | −1.1 pts | −0.9 pts | −0.6 pts |
Single parents head only 7.1% of households in ZIP 21231, well below the national share of 11.6%. The single-parent share is down 4.8 points from 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 21231
Renters in ZIP 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 58.0% | 32.0% | 31.0% | 33.3% |
| 2010–14 | 62.6% | 33.5% | 32.9% | 35.6% |
| 2015–19 | 61.7% | 33.5% | 33.1% | 36.0% |
| 2020–24 | 65.9% | 33.1% | 32.4% | 34.8% |
| Change | +7.9 pts | +1.1 pts | +1.4 pts | +1.5 pts |
Renters far outnumber owners in ZIP 21231: 65.9% of households rent their homes, against 34.8% nationally. More than a quarter of owners (27.8%) have paid off their mortgages, well below the national share of 39.8%. Since 2006–10, the renter share has risen 7.9 points, a much bigger shift than nationally. Only eight of the 240 Maryland ZIP codes with 5,000+ people have a higher 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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 23.2% | 9.3% | 9.0% | 11.4% |
| 2010–14 | 14.2% | 9.3% | 8.9% | 11.4% |
| 2015–19 | 17.5% | 9.4% | 8.9% | 11.1% |
| 2020–24 | 15.0% | 7.2% | 7.1% | 9.6% |
| Change | −8.2 pts | −2.1 pts | −1.9 pts | −1.8 pts |
Vacancy is high in ZIP 21231: 15.0% 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. Vacancy has fallen 8.2 points since 2006–10, a much bigger shift than nationally.
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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 1945 | 1971 | 1974 | 1974 |
| 2010–14 | 1940 | 1972 | 1975 | 1975 |
| 2015–19 | 1957 | 1973 | 1976 | 1977 |
| 2020–24 | 1968 | 1975 | 1978 | 1980 |
| Change | +23 | +4 | +4 | +6 |
The housing in ZIP 21231 is old by national standards: the median home dates to 1968, against 1980 for the U.S., so buyers will find more older houses, some of them due for updates. The median year built has moved up from 1945 in 2006–10, a sign of steady new building. Newer construction is concentrated in the southwest, while the center 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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,125 | $1,179 | $1,249 | $965 |
| 2010–14 | $1,174 | $1,293 | $1,363 | $1,040 |
| 2015–19 | $1,432 | $1,477 | $1,576 | $1,213 |
| 2020–24 | $1,767 | $1,778 | $1,869 | $1,571 |
| Change | +$643 | +$599 | +$620 | +$606 |
Rent in ZIP 21231 runs $1,767 a month at the median, utilities included, above the U.S. median of $1,571. Rents are up $643 a month from 2006–10, a 57% rise, a slower climb than the nation's. The typical renter here spends 28.4% of household income on rent, just under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally. The priciest rents are in the south; the most affordable are in the northwest.
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 21231
Bachelor's degrees in ZIP 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 52.4% | 35.6% | 36.3% | 28.4% |
| 2010–14 | 53.2% | 37.3% | 37.7% | 29.6% |
| 2015–19 | 63.3% | 40.8% | 40.5% | 32.1% |
| 2020–24 | 62.8% | 44.1% | 43.4% | 35.6% |
| Change | +10.4 pts | +8.5 pts | +7.1 pts | +7.2 pts |
ZIP 21231 is highly educated: just over six in ten adults 25 and older (62.8%) hold at least a bachelor's degree, far above the national share of 35.6%. Since 2006–10, the share with a degree has risen 10.4 points, mirroring the country. College graduates are most concentrated in the east and least in the northwest.
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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 78.4% | 87.8% | 88.0% | 84.9% |
| 2010–14 | 83.8% | 89.5% | 89.1% | 86.1% |
| 2015–19 | 89.6% | 91.1% | 90.2% | 87.7% |
| 2020–24 | 94.1% | 92.1% | 90.9% | 89.3% |
| Change | +15.6 pts | +4.3 pts | +2.9 pts | +4.3 pts |
High school completion in ZIP 21231 is above the national rate: 94.1% of adults have a diploma or equivalent, against 89.3%. Since 2006–10, the share with a diploma has risen 15.6 points, 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 21231
| Period | ZIP 21231 | Baltimore area | Maryland | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.6% | 6.6% | 6.5% | 8.1% |
| 2010–14 | 9.9% | 8.3% | 8.1% | 9.4% |
| 2015–19 | 4.5% | 5.2% | 5.1% | 5.6% |
| 2020–24 | 5.1% | 4.8% | 5.0% | 5.4% |
| Change | −1.5 pts | −1.8 pts | −1.5 pts | −2.7 pts |
At 5.1%, unemployment in ZIP 21231 is close to the national rate of 5.4%. Unemployment has edged down 1.5 points since 2006–10, mirroring the country. 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 21231 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 21231 | 1.84 | 33.4 | 7.1% | 65.9% | 15.0% | 1968 | $1,767 | 62.8% | 94.1% | 5.1% |
| ZIP 21287 | 2.41 | 31.9 | 13.0% | 35.3% | 6.7% | 1977 | $1,065 | 57.1% | 97.5% | 1.9% |
| ZIP 21202 | 1.62 | 36.6 | 10.9% | 77.7% | 13.9% | 1967 | $1,416 | 42.6% | 84.7% | 8.2% |
| ZIP 21205 | 2.54 | 36.5 | 29.6% | 63.2% | 19.2% | 1953 | $1,141 | 18.0% | 80.0% | 6.4% |
| ZIP 21201 | 1.64 | 34.6 | 13.0% | 90.2% | 9.5% | 1970 | $1,247 | 46.1% | 91.4% | 7.4% |
| ZIP 21224 | 2.50 | 35.3 | 15.9% | 41.1% | 12.5% | 1952 | $1,833 | 41.8% | 79.1% | 4.9% |
| ZIP 21213 | 2.49 | 37.9 | 28.9% | 48.0% | 18.1% | 1946 | $1,362 | 19.3% | 83.9% | 8.9% |
| ZIP 21230 | 2.24 | 34.7 | 9.7% | 48.4% | 10.7% | 1960 | $1,847 | 53.0% | 82.2% | 4.7% |
| ZIP 21217 | 1.98 | 39.7 | 14.6% | 69.3% | 20.8% | 1947 | $1,136 | 24.5% | 84.0% | 11.9% |
| ZIP 21218 | 2.11 | 37.7 | 14.2% | 52.3% | 14.6% | 1946 | $1,344 | 46.4% | 90.0% | 7.5% |
| ZIP 21223 | 2.33 | 38.6 | 23.6% | 68.5% | 30.4% | 1943 | $1,244 | 17.0% | 78.9% | 11.3% |
All figures 2020–24.
Zip codes with similar populations: 60455, IL · 42164, KY · 44022, OH · 44505, OH · 44820, OH · 45344, OH · 00714, PR · 46774, IN · 49431, MI · 55306, MN
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 21231. 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.