Population 8,208 · Census ACS 2020–24
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Population and households in ZIP 01921
Household size in ZIP 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.04 | 2.54 | 2.53 | 2.68 |
| 2010–14 | 3.05 | 2.59 | 2.57 | 2.73 |
| 2015–19 | 2.93 | 2.60 | 2.57 | 2.71 |
| 2020–24 | 3.06 | 2.55 | 2.52 | 2.65 |
| Change | +0.02 | +0.01 | −0.01 | −0.03 |
Households in ZIP 01921 are large by national standards, averaging 3.06 people against 2.65 for the U.S. That usually means more families with children at home. Of the 343 Massachusetts ZIP codes with 5,000+ people, only six 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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 42.4 | 38.9 | 39.4 | 37.7 |
| 2010–14 | 45.6 | 39.7 | 40.1 | 38.6 |
| 2015–19 | 46.2 | 40.4 | 41.0 | 39.6 |
| 2020–24 | 47.7 | 40.8 | 41.4 | 40.1 |
| Change | +5.3 | +1.9 | +2.0 | +2.3 |
With a median age of 47.7, ZIP 01921 is noticeably older than the country as a whole (40.1), an age mix that tilts toward empty nesters and retirees. The median age has climbed from 42.4 in 2006–10, mirroring the country. The youngest areas are in the southeast, the oldest in the north.
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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.9% | 10.4% | 11.0% | 12.3% |
| 2010–14 | 5.7% | 10.2% | 11.0% | 12.3% |
| 2015–19 | 3.3% | 9.6% | 10.3% | 11.6% |
| 2020–24 | 4.7% | 9.7% | 10.6% | 11.6% |
| Change | −4.2 pts | −0.7 pts | −0.4 pts | −0.6 pts |
Single parents head only 4.7% of households in ZIP 01921, well below the national share of 11.6%. The single-parent share is down 4.2 points from 2006–10, a much bigger shift than nationally. ZIP 01921 has a lower share of single-parent households than at least four in five Massachusetts ZIP codes.
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 01921
Renters in ZIP 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.5% | 36.8% | 36.0% | 33.3% |
| 2010–14 | 2.5% | 38.5% | 37.7% | 35.6% |
| 2015–19 | 2.4% | 38.3% | 37.6% | 36.0% |
| 2020–24 | 5.1% | 38.4% | 37.5% | 34.8% |
| Change | +2.5 pts | +1.6 pts | +1.5 pts | +1.5 pts |
ZIP 01921 is overwhelmingly a place of homeowners: only 5.1% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. About three in ten owners (30.0%) have paid off their mortgages, below the national share of 39.8%. The renter share has risen 2.5 points since 2006–10, in line with the national trend.
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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.7% | 8.1% | 9.5% | 11.4% |
| 2010–14 | 3.5% | 7.4% | 9.1% | 11.4% |
| 2015–19 | 1.8% | 7.3% | 8.9% | 11.1% |
| 2020–24 | 5.3% | 6.7% | 7.9% | 9.6% |
| Change | +1.6 pts | −1.4 pts | −1.6 pts | −1.8 pts |
Empty homes are scarce in ZIP 01921: just 5.3% sit vacant, compared with 9.6% nationally, a sign of a tight housing market. That is in line with the rest of the Boston area. Vacancy has risen 1.6 points since 2006–10, 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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 1978 | 1958 | 1958 | 1974 |
| 2010–14 | 1977 | 1959 | 1959 | 1975 |
| 2015–19 | 1976 | 1961 | 1961 | 1977 |
| 2020–24 | 1978 | 1964 | 1963 | 1980 |
| Change | −0 | +6 | +5 | +6 |
Homes in ZIP 01921 are about the same age as the nation's housing: the median home was built in 1978, versus 1980 nationally. Homes here are newer than in the Boston area as a whole, where the median home dates to 1964. Newer construction is concentrated in the west, while the east 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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | $986 | $1,171 | $1,085 | $965 |
| 2010–14 | $771 | $1,251 | $1,157 | $1,040 |
| 2015–19 | $870 | $1,537 | $1,398 | $1,213 |
| 2020–24 | $773 | $2,051 | $1,860 | $1,571 |
| Change | −$213 | +$881 | +$775 | +$606 |
The median renter in ZIP 01921 pays $773 a month for rent and utilities, well below the national median of $1,571. Rent has fallen $213 a month since 2006–10, down 22%, even as the national median rose. Rent takes 27.7% of the typical renter's income, just under the 30% mark often used to define affordable rent. Only one other Massachusetts ZIP code with 5,000+ people has 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 01921
Bachelor's degrees in ZIP 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 62.0% | 42.2% | 38.5% | 28.4% |
| 2010–14 | 59.1% | 44.1% | 40.1% | 29.6% |
| 2015–19 | 68.0% | 48.2% | 43.6% | 32.1% |
| 2020–24 | 71.0% | 51.9% | 47.2% | 35.6% |
| Change | +9.0 pts | +9.7 pts | +8.7 pts | +7.2 pts |
ZIP 01921 is highly educated: about seven in ten adults 25 and older (71.0%) hold at least a bachelor's degree, far above the national share of 35.6%. The share with a degree has risen 9.0 points since 2006–10, mirroring the country. ZIP 01921 has a higher share of college graduates than the great majority of Massachusetts ZIP codes.
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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 99.0% | 89.8% | 88.4% | 84.9% |
| 2010–14 | 97.8% | 90.6% | 89.3% | 86.1% |
| 2015–19 | 98.1% | 91.5% | 90.5% | 87.7% |
| 2020–24 | 98.5% | 91.8% | 91.0% | 89.3% |
| Change | −0.5 pts | +2.1 pts | +2.6 pts | +4.3 pts |
Finishing high school is nearly universal in ZIP 01921: 98.5% 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 edged down 0.5 points, even as the national rate rose. Only 18 of the 343 Massachusetts ZIP codes with 5,000+ people 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 01921
| Period | ZIP 01921 | Boston area | Massachusetts | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.1% | 7.0% | 7.5% | 8.1% |
| 2010–14 | 9.0% | 8.0% | 8.7% | 9.4% |
| 2015–19 | 3.9% | 4.6% | 5.0% | 5.6% |
| 2020–24 | 3.0% | 4.9% | 5.2% | 5.4% |
| Change | −3.1 pts | −2.1 pts | −2.3 pts | −2.7 pts |
The job market in ZIP 01921 has been strong: just 3.0% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment has fallen 3.1 points since 2006–10, mirroring the country. 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 01921 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 01921 | 3.06 | 47.7 | 4.7% | 5.1% | 5.3% | 1978 | $773 | 71.0% | 98.5% | 3.0% |
| ZIP 01833 | 2.65 | 43.6 | 5.2% | 16.0% | 2.4% | 1978 | $1,898 | 56.8% | 98.0% | 1.7% |
| ZIP 01983 | 2.93 | 42.7 | 4.6% | 9.5% | 4.9% | 1967 | $1,233 | 69.0% | 97.6% | 1.4% |
| ZIP 01845 | 2.69 | 41.8 | 8.9% | 30.9% | 6.0% | 1977 | $2,466 | 62.0% | 96.8% | 3.4% |
| ZIP 01834 | 2.58 | 45.1 | 4.0% | 9.7% | 7.8% | 1975 | $1,775 | 45.6% | 96.1% | 6.0% |
| ZIP 01949 | 2.71 | 43.0 | 3.7% | 7.2% | 7.0% | 1986 | $1,484 | 42.0% | 91.1% | 3.3% |
| ZIP 01969 | 2.56 | 48.4 | 8.5% | 18.3% | 5.0% | 1973 | $1,689 | 56.7% | 99.6% | 3.5% |
| ZIP 01835 | 2.68 | 39.5 | 15.4% | 24.6% | 5.0% | 1961 | $1,898 | 39.6% | 94.0% | 3.4% |
| ZIP 01937 | 2.44 | 37.6 | 8.7% | 78.0% | 4.0% | 2004 | $2,687 | 58.3% | 96.1% | 0.4% |
| ZIP 01922 | 2.47 | 50.2 | 10.3% | 18.6% | 10.5% | 1987 | $1,806 | 57.6% | 96.1% | 2.3% |
| ZIP 01843 | 2.70 | 35.9 | 23.3% | 67.9% | 3.1% | 1954 | $1,675 | 18.7% | 75.5% | 7.5% |
All figures 2020–24.
Zip codes with similar populations: 00765, PR · 79830, TX · 89429, NV · 27310, NC · 27949, NC · 66025, KS · 15417, PA · 71671, AR · 60401, IL · 28754, NC
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 01921. 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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