Population 36,335 · Census ACS 2020–24
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Population and households in Arnold
Household size in Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.63 | 2.52 | 2.49 | 2.68 |
| 2010–14 | 2.68 | 2.53 | 2.52 | 2.73 |
| 2015–19 | 2.58 | 2.49 | 2.50 | 2.71 |
| 2020–24 | 2.50 | 2.46 | 2.49 | 2.65 |
| Change | −0.14 | −0.06 | −0.00 | −0.03 |
Households in Arnold run a little small, averaging 2.50 people against 2.65 nationally, which usually means more singles and couples and fewer children. That is in line with the rest of the St. Louis area. Household size has dropped from 2.63 in 2006–10, a much bigger shift than nationally.
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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 39.1 | 38.5 | 38.4 | 37.7 |
| 2010–14 | 39.7 | 39.5 | 39.2 | 38.6 |
| 2015–19 | 39.7 | 40.7 | 40.0 | 39.6 |
| 2020–24 | 41.5 | 40.8 | 40.1 | 40.1 |
| Change | +2.4 | +2.3 | +1.7 | +2.3 |
At 41.5, the median age in Arnold is close to the national median of 40.1, so its age mix looks much like the country's. Since 2006–10, the median age has climbed from 39.1, mirroring the country. Residents skew youngest in the southeast and oldest in the center.
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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 9.1% | 11.7% | 11.3% | 12.3% |
| 2010–14 | 8.7% | 11.5% | 11.4% | 12.3% |
| 2015–19 | 10.7% | 11.0% | 10.9% | 11.6% |
| 2020–24 | 10.1% | 11.1% | 11.0% | 11.6% |
| Change | +1.0 pts | −0.6 pts | −0.3 pts | −0.6 pts |
Single parents head about one in ten households in Arnold (10.1%), a little below the national share of 11.6%. That is in line with the rest of the St. Louis area. The single-parent share has edged up 1.0 points since 2006–10, 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 Arnold
Renters in Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 16.5% | 28.3% | 30.0% | 33.3% |
| 2010–14 | 16.9% | 30.1% | 32.1% | 35.6% |
| 2015–19 | 24.6% | 31.1% | 33.2% | 36.0% |
| 2020–24 | 20.0% | 29.6% | 31.9% | 34.8% |
| Change | +3.5 pts | +1.4 pts | +1.9 pts | +1.5 pts |
Arnold is largely a place of homeowners: only 20.0% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Among homeowners, 31.4% have no mortgage at all, below the national share of 39.8%. Since 2006–10, the renter share has risen 3.5 points, as it has 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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.8% | 9.6% | 11.6% | 11.4% |
| 2010–14 | 9.9% | 10.1% | 12.0% | 11.4% |
| 2015–19 | 5.9% | 10.1% | 12.2% | 11.1% |
| 2020–24 | 6.6% | 8.8% | 10.5% | 9.6% |
| Change | −2.3 pts | −0.8 pts | −1.1 pts | −1.8 pts |
Fewer homes sit empty in Arnold than nationally: 6.6%, against 9.6% for the U.S. Since 2006–10, vacancy has fallen 2.3 points, in line with the national trend.
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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 1982 | 1972 | 1974 | 1974 |
| 2010–14 | 1981 | 1972 | 1975 | 1975 |
| 2015–19 | 1982 | 1973 | 1976 | 1977 |
| 2020–24 | 1984 | 1975 | 1978 | 1980 |
| Change | +2 | +3 | +4 | +6 |
Homes in Arnold are a bit newer than the national norm: the median home was built in 1984, versus 1980 across the U.S. The newest homes are mostly in the south, the oldest in the north.
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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | $753 | $825 | $740 | $965 |
| 2010–14 | $843 | $920 | $816 | $1,040 |
| 2015–19 | $953 | $1,010 | $899 | $1,213 |
| 2020–24 | $1,092 | $1,239 | $1,122 | $1,571 |
| Change | +$340 | +$414 | +$383 | +$606 |
A typical rental in Arnold costs $1,092 a month with utilities, well below the national median of $1,571. Rent has climbed $340 a month since 2006–10, up 45%, a slower climb than the nation's. The typical renter here spends 24.1% of household income on rent, comfortably under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally.
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 Arnold
Bachelor's degrees in Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 18.7% | 30.3% | 26.0% | 28.4% |
| 2010–14 | 21.7% | 32.1% | 27.3% | 29.6% |
| 2015–19 | 23.3% | 34.9% | 29.6% | 32.1% |
| 2020–24 | 26.3% | 38.5% | 32.6% | 35.6% |
| Change | +7.5 pts | +8.3 pts | +6.6 pts | +7.2 pts |
Just over a quarter of adults 25 and older in Arnold (26.3%) have a bachelor's degree or higher, below the national share of 35.6%. The share with a degree has risen 7.5 points since 2006–10, 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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 87.5% | 88.8% | 86.8% | 84.9% |
| 2010–14 | 88.7% | 90.5% | 88.3% | 86.1% |
| 2015–19 | 89.4% | 92.1% | 90.0% | 87.7% |
| 2020–24 | 91.4% | 93.6% | 91.8% | 89.3% |
| Change | +3.9 pts | +4.8 pts | +5.1 pts | +4.3 pts |
High school completion in Arnold is a bit above the national rate: 91.4% of adults have a diploma or equivalent, against 89.3%. Still, the rate is lower than in the St. Louis area as a whole (93.6%). The share with a diploma has risen 3.9 points since 2006–10, in line with the national trend.
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 Arnold
| Period | Arnold | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.2% | 7.7% | 7.4% | 8.1% |
| 2010–14 | 7.6% | 8.8% | 8.4% | 9.4% |
| 2015–19 | 5.6% | 4.9% | 4.6% | 5.6% |
| 2020–24 | 3.2% | 4.3% | 4.1% | 5.4% |
| Change | −3.0 pts | −3.4 pts | −3.3 pts | −2.7 pts |
Unemployment in Arnold has been low: just 3.2% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment has fallen 3.0 points since 2006–10, as it has nationally. 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).
Arnold compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Arnold | 2.50 | 41.5 | 10.1% | 20.0% | 6.6% | 1984 | $1,092 | 26.3% | 91.4% | 3.2% |
| Imperial | 2.78 | 39.9 | 10.6% | 16.5% | 4.4% | 1993 | $1,137 | 26.9% | 94.1% | 2.9% |
| Oakville | 2.55 | 44.3 | 6.3% | 13.9% | 2.4% | 1983 | $1,135 | 44.1% | 96.3% | 4.1% |
| Merrimac | 2.76 | 43.1 | 6.8% | 18.9% | 6.4% | 2000 | $1,120 | 20.4% | 93.7% | 0.5% |
| Concord | 2.49 | 44.0 | 8.8% | 15.0% | 5.3% | 1970 | $1,212 | 42.2% | 96.8% | 2.8% |
| Mehlville | 2.22 | 43.5 | 7.3% | 33.8% | 6.4% | 1971 | $1,194 | 31.8% | 92.9% | 2.3% |
| Fenton | 2.64 | 42.4 | 7.1% | 20.3% | 6.0% | 1989 | $1,306 | 44.9% | 95.2% | 2.1% |
| Barnhart | 2.69 | 38.9 | 21.8% | 7.4% | 3.7% | 1987 | $1,342 | 26.1% | 95.8% | 2.9% |
| Murphy | 2.47 | 40.6 | 8.9% | 15.3% | 8.5% | 1982 | $1,065 | 23.9% | 91.7% | 3.8% |
| Sunset Hills | 2.41 | 52.2 | 7.2% | 18.3% | 5.0% | 1978 | $1,782 | 59.4% | 96.8% | 2.8% |
| Green Park | 2.42 | 44.6 | 8.6% | 11.5% | 2.5% | 1969 | $963 | 42.4% | 91.3% | 1.2% |
All figures 2020–24.
Cities with similar populations: Key West, FL · Altadena, CA · Willis, TX · Williamstown, NJ · West Babylon, NY · Trumbull, CT · Cabo Rojo, PR · Okeechobee, FL · Newburgh, IN · Irmo, SC
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 Arnold. 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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