Population 3,494 · Census ACS 2020–24
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Population and households in Seneca
Household size in Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.76 | 2.79 | 2.69 | 2.68 |
| 2010–14 | 3.00 | 2.82 | 2.71 | 2.73 |
| 2015–19 | 2.67 | 2.75 | 2.66 | 2.71 |
| 2020–24 | 2.65 | 2.66 | 2.58 | 2.65 |
| Change | −0.11 | −0.12 | −0.11 | −0.03 |
At 2.65 people per household, Seneca sits right at the national average. Household size has dropped from 2.76 in 2006–10, 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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 38.2 | 36.8 | 37.6 | 37.7 |
| 2010–14 | 36.5 | 37.8 | 38.5 | 38.6 |
| 2015–19 | 39.9 | 38.9 | 39.6 | 39.6 |
| 2020–24 | 39.0 | 39.7 | 40.2 | 40.1 |
| Change | +0.8 | +3.0 | +2.6 | +2.3 |
Half of the people in Seneca are younger than 39.0 and half are older, close to the national median of 40.1.
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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 11.2% | 12.0% | 11.7% | 12.3% |
| 2010–14 | 14.7% | 12.0% | 11.7% | 12.3% |
| 2015–19 | 12.4% | 11.2% | 11.1% | 11.6% |
| 2020–24 | 10.4% | 11.5% | 11.3% | 11.6% |
| Change | −0.9 pts | −0.5 pts | −0.4 pts | −0.6 pts |
Single parents head about one in ten households in Seneca (10.4%), a little below the national share of 11.6%.
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 Seneca
Renters in Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 14.4% | 32.1% | 30.8% | 33.3% |
| 2010–14 | 21.9% | 34.8% | 33.1% | 35.6% |
| 2015–19 | 18.4% | 35.5% | 33.9% | 36.0% |
| 2020–24 | 18.9% | 34.5% | 32.9% | 34.8% |
| Change | +4.5 pts | +2.3 pts | +2.1 pts | +1.5 pts |
Seneca is largely a place of homeowners: only 18.9% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Among homeowners, 41.6% have no mortgage at all, 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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 5.1% | 9.8% | 10.0% | 11.4% |
| 2010–14 | 11.1% | 9.8% | 10.1% | 11.4% |
| 2015–19 | 12.5% | 8.9% | 9.8% | 11.1% |
| 2020–24 | 7.2% | 7.2% | 8.1% | 9.6% |
| Change | +2.1 pts | −2.6 pts | −1.9 pts | −1.8 pts |
Vacancy is on the low side in Seneca: 7.2% of homes sit empty, against 9.6% nationally, which points to steady demand for housing. That is in line with the rest of the Chicago area.
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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 1972 | 1966 | 1966 | 1974 |
| 2010–14 | 1982 | 1967 | 1967 | 1975 |
| 2015–19 | 1976 | 1967 | 1968 | 1977 |
| 2020–24 | 1982 | 1970 | 1970 | 1980 |
| Change | +10 | +4 | +4 | +6 |
Homes in Seneca are about the same age as the nation's housing: the median home was built in 1982, versus 1980 nationally. Homes here are newer than in the Chicago area overall, where the median home dates to 1970.
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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | $712 | $1,060 | $953 | $965 |
| 2010–14 | $822 | $1,142 | $1,028 | $1,040 |
| 2015–19 | $936 | $1,306 | $1,165 | $1,213 |
| 2020–24 | $1,281 | $1,602 | $1,428 | $1,571 |
| Change | +$569 | +$542 | +$475 | +$606 |
The median renter in Seneca pays $1,281 a month for rent and utilities, below the national median of $1,571. Rent takes 18.6% 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 Seneca
Bachelor's degrees in Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 19.8% | 33.9% | 31.2% | 28.4% |
| 2010–14 | 14.7% | 35.2% | 32.4% | 29.6% |
| 2015–19 | 16.5% | 37.9% | 34.7% | 32.1% |
| 2020–24 | 17.9% | 40.9% | 37.7% | 35.6% |
| Change | −1.9 pts | +7.0 pts | +6.5 pts | +7.2 pts |
Fewer adults in Seneca have a four-year degree than in the country as a whole: 17.9%, against 35.6% 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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 87.8% | 85.6% | 86.3% | 84.9% |
| 2010–14 | 92.8% | 86.7% | 87.5% | 86.1% |
| 2015–19 | 92.5% | 88.4% | 89.1% | 87.7% |
| 2020–24 | 94.3% | 89.5% | 90.3% | 89.3% |
| Change | +6.6 pts | +3.9 pts | +4.0 pts | +4.3 pts |
High school completion is high in Seneca: 94.3% 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 Seneca
| Period | Seneca | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 9.5% | 9.1% | 8.7% | 8.1% |
| 2010–14 | 10.6% | 10.8% | 10.2% | 9.4% |
| 2015–19 | 10.0% | 6.3% | 6.1% | 5.6% |
| 2020–24 | 6.9% | 6.3% | 6.0% | 5.4% |
| Change | −2.6 pts | −2.8 pts | −2.7 pts | −2.7 pts |
Unemployment runs high in Seneca: 6.9% of the labor force was out of work and looking, against 5.4% nationally. That is in line with the rest of the Chicago area. 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).
Seneca 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Seneca | 2.65 | 39.0 | 10.4% | 18.9% | 7.2% | 1982 | $1,281 | 17.9% | 94.3% | 6.9% |
| Marseilles | 2.48 | 42.8 | 7.8% | 23.9% | 12.6% | 1974 | $1,007 | 22.3% | 94.6% | 6.4% |
| Stavanger | 2.66 | 44.8 | 4.8% | 18.5% | 6.3% | 1988 | $1,090 | 23.6% | 95.6% | 2.2% |
| Verona | 2.42 | 43.9 | 7.8% | 13.9% | 13.0% | 1966 | $1,109 | 25.2% | 98.5% | 4.3% |
| Kinsman | 2.44 | 43.5 | 7.4% | 14.4% | 9.5% | 1963 | $1,021 | 23.6% | 97.7% | 6.9% |
| Ransom | 2.38 | 50.7 | 12.4% | 9.4% | 5.6% | 1968 | $871 | 21.5% | 97.2% | 11.5% |
| Morris | 2.48 | 42.0 | 10.1% | 35.2% | 3.7% | 1981 | $1,162 | 24.4% | 94.1% | 3.4% |
| Mazon | 2.62 | 42.2 | 10.5% | 16.2% | 5.2% | 1978 | $994 | 18.9% | 93.4% | 2.1% |
| Stoneyville | 2.77 | 30.2 | 15.4% | 27.0% | 3.1% | 1969 | $928 | 12.8% | 90.1% | 0.0% |
| Woodland Addition | 2.48 | 46.7 | 8.5% | 15.9% | 6.4% | 1981 | $999 | 26.2% | 97.8% | 3.7% |
| Lisbon | 3.06 | 36.4 | 7.6% | 22.5% | 4.4% | 1972 | $1,425 | 22.2% | 95.7% | 3.4% |
All figures 2020–24.
Cities with similar populations: Arley, AL · Cleveland, FL · Millville, MA · Harbour Heights, FL · Schuylerville, NY · Pistakee Highlands, IL · Palmyra, IN · Ohioville, PA · Ochlocknee, GA · New Vienna, OH
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 Seneca. 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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