Population 11,340 · Census ACS 2020–24
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Population and households in ZIP 18031
Household size in ZIP 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.55 | 2.55 | 2.51 | 2.68 |
| 2010–14 | 2.59 | 2.60 | 2.53 | 2.73 |
| 2015–19 | 2.59 | 2.57 | 2.50 | 2.71 |
| 2020–24 | 2.85 | 2.56 | 2.46 | 2.65 |
| Change | +0.30 | +0.01 | −0.05 | −0.03 |
The typical household in ZIP 18031 holds 2.85 people, more than the U.S. average of 2.65. Since 2006–10, household size has climbed from 2.55, even as the national average fell. Of the 628 Pennsylvania ZIP codes with 5,000+ people, only 44 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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 38.3 | 40.7 | 40.3 | 37.7 |
| 2010–14 | 36.1 | 41.6 | 41.0 | 38.6 |
| 2015–19 | 40.3 | 42.3 | 41.8 | 39.6 |
| 2020–24 | 39.9 | 42.3 | 42.0 | 40.1 |
| Change | +1.6 | +1.6 | +1.7 | +2.3 |
Half of the people in ZIP 18031 are younger than 39.9 and half are older, close to the national median of 40.1. The population here is younger than in the wider Allentown area, where the median age is 42.3. The median age has climbed from 38.3 in 2006–10, as it has nationally.
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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 5.5% | 10.8% | 10.5% | 12.3% |
| 2010–14 | 6.6% | 11.0% | 10.6% | 12.3% |
| 2015–19 | 8.4% | 11.4% | 10.5% | 11.6% |
| 2020–24 | 8.8% | 11.5% | 10.7% | 11.6% |
| Change | +3.3 pts | +0.7 pts | +0.2 pts | −0.6 pts |
Single parents head about one in twelve households in ZIP 18031 (8.8%), below the national share of 11.6%. Since 2006–10, the single-parent share has risen 3.3 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 18031
Renters in ZIP 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 19.8% | 26.9% | 29.0% | 33.3% |
| 2010–14 | 24.6% | 29.3% | 30.5% | 35.6% |
| 2015–19 | 35.8% | 31.2% | 31.1% | 36.0% |
| 2020–24 | 23.1% | 30.3% | 30.7% | 34.8% |
| Change | +3.3 pts | +3.4 pts | +1.7 pts | +1.5 pts |
Only 23.1% of households in ZIP 18031 rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Among homeowners, 26.0% have no mortgage at all, well below the national share of 39.8%. Renting is most common in the northeast and least common in the northwest. Since 2006–10, the renter share has risen 3.3 points, mirroring the country.
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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.6% | 8.0% | 10.3% | 11.4% |
| 2010–14 | 6.2% | 8.6% | 10.5% | 11.4% |
| 2015–19 | 2.6% | 8.3% | 10.7% | 11.1% |
| 2020–24 | 12.2% | 6.5% | 9.1% | 9.6% |
| Change | +4.6 pts | −1.5 pts | −1.2 pts | −1.8 pts |
Vacancy runs a little high in ZIP 18031: 12.2% of homes are empty, against 9.6% nationally. The count includes vacation homes and homes between owners or tenants, not just abandoned ones. Since 2006–10, vacancy has risen 4.6 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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 1996 | 1965 | 1963 | 1974 |
| 2010–14 | 2001 | 1967 | 1964 | 1975 |
| 2015–19 | 2003 | 1967 | 1965 | 1977 |
| 2020–24 | 2003 | 1969 | 1967 | 1980 |
| Change | +7 | +3 | +4 | +6 |
Much of the housing in ZIP 18031 is relatively new: half of its homes were built after 2003, compared with 1980 for the U.S. as a whole. The median year built has moved up from 1996 in 2006–10, a sign of steady new building. Newer construction is concentrated in the south, while the northwest has the oldest housing. ZIP 18031 has the newest homes of any Pennsylvania ZIP code with 5,000+ people.
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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,338 | $928 | $829 | $965 |
| 2010–14 | $1,194 | $1,020 | $923 | $1,040 |
| 2015–19 | $1,556 | $1,170 | $1,039 | $1,213 |
| 2020–24 | $1,841 | $1,504 | $1,323 | $1,571 |
| Change | +$503 | +$576 | +$494 | +$606 |
A typical rental in ZIP 18031 costs $1,841 a month with utilities, above the national median of $1,571. Rent has climbed $503 a month since 2006–10, up 38%, a slower climb than the nation's. Rent takes 29.0% of the typical renter's income, just under the 30% mark often used to define affordable rent. The priciest rents are in the center; the most affordable are in the southeast.
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 18031
Bachelor's degrees in ZIP 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 36.9% | 26.0% | 27.2% | 28.4% |
| 2010–14 | 42.9% | 26.7% | 28.7% | 29.6% |
| 2015–19 | 47.8% | 29.5% | 31.8% | 32.1% |
| 2020–24 | 53.4% | 33.3% | 35.6% | 35.6% |
| Change | +16.6 pts | +7.3 pts | +8.3 pts | +7.2 pts |
College graduates are unusually common in ZIP 18031: 53.4% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. Since 2006–10, the share with a degree has risen 16.6 points, as it has nationally.
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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 91.7% | 86.4% | 87.3% | 84.9% |
| 2010–14 | 96.4% | 88.0% | 88.8% | 86.1% |
| 2015–19 | 95.4% | 89.7% | 90.3% | 87.7% |
| 2020–24 | 97.7% | 91.4% | 91.8% | 89.3% |
| Change | +6.0 pts | +5.0 pts | +4.5 pts | +4.3 pts |
Finishing high school is nearly universal in ZIP 18031: 97.7% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma is up 6.0 points from 2006–10, as it has nationally. Of the 628 Pennsylvania ZIP codes with 5,000+ people, only 52 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 18031
| Period | ZIP 18031 | Allentown area | Pennsylvania | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.0% | 7.3% | 7.5% | 8.1% |
| 2010–14 | 8.3% | 9.4% | 8.8% | 9.4% |
| 2015–19 | 5.6% | 5.5% | 5.5% | 5.6% |
| 2020–24 | 2.5% | 5.5% | 5.4% | 5.4% |
| Change | −4.5 pts | −1.8 pts | −2.1 pts | −2.7 pts |
The job market in ZIP 18031 has been strong: just 2.5% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment has fallen 4.5 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 18031 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 18031 | 2.85 | 39.9 | 8.8% | 23.1% | 12.2% | 2003 | $1,841 | 53.4% | 97.7% | 2.5% |
| ZIP 18087 | 2.29 | 46.5 | 8.1% | 49.7% | 7.4% | 1995 | $1,728 | 44.8% | 94.6% | 0.8% |
| ZIP 19538 | 2.77 | 41.1 | 2.6% | 11.3% | 6.0% | 1965 | $1,500 | 37.2% | 84.1% | 0.0% |
| ZIP 18011 | 2.85 | 38.3 | 13.4% | 16.9% | 4.8% | 1986 | $1,577 | 36.2% | 95.5% | 6.2% |
| ZIP 18106 | 2.56 | 45.7 | 9.3% | 10.6% | 3.5% | 1989 | $1,542 | 49.5% | 93.5% | 5.7% |
| ZIP 18051 | 2.58 | 45.7 | 5.8% | 18.8% | 7.6% | 1989 | $2,146 | 48.2% | 97.7% | 1.5% |
| ZIP 18062 | 2.69 | 46.6 | 6.7% | 20.5% | 4.3% | 1989 | $1,877 | 49.4% | 96.3% | 2.7% |
| ZIP 18046 | 2.73 | 39.2 | 11.8% | 9.1% | 4.3% | 1985 | $1,548 | 55.5% | 96.6% | 5.9% |
| ZIP 19562 | 2.07 | 51.5 | 17.3% | 38.4% | 5.7% | 1961 | $1,167 | 18.8% | 87.4% | 4.1% |
| ZIP 19539 | 2.52 | 47.5 | 6.6% | 11.0% | 3.4% | 1974 | $1,167 | 26.4% | 92.8% | 3.2% |
| ZIP 18069 | 2.65 | 46.3 | 7.4% | 11.3% | 2.9% | 1988 | $1,654 | 51.0% | 96.4% | 4.3% |
All figures 2020–24.
Zip codes with similar populations: 07456, NJ · 95012, CA · 07885, NJ · 08031, NJ · 17972, PA · 48001, MI · 60176, IL · 59301, MT · 55409, MN · 55042, 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 18031. 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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