Population 124 · Census ACS 2020–24
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Median age by neighborhoodHistory and comparison ↓︎
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Population and households in Seneca
Household size in Seneca
| Period | Seneca | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 2.42 | 2.44 | 2.68 |
| 2010–14 | 2.23 | 2.45 | 2.73 |
| 2015–19 | 2.08 | 2.43 | 2.71 |
| 2020–24 | 2.15 | 2.43 | 2.65 |
| Change | −0.27 | −0.01 | −0.03 |
Households in Seneca are small: just 2.15 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 2.42, but in a place this small, survey estimates can swing a lot from one release to the next.
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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 45.7 | 38.8 | 37.7 |
| 2010–14 | 49.1 | 39.3 | 38.6 |
| 2015–19 | 52.5 | 39.7 | 39.6 |
| 2020–24 | 47.7 | 39.8 | 40.1 |
| Change | +2.0 | +1.0 | +2.3 |
With a median age of 47.7, Seneca is noticeably older than the country as a whole (40.1), an age mix that tilts toward empty nesters and retirees.
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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 6.1% | 9.5% | 12.3% |
| 2010–14 | 5.0% | 9.9% | 12.3% |
| 2015–19 | 4.3% | 10.0% | 11.6% |
| 2020–24 | 4.4% | 10.0% | 11.6% |
| Change | −1.7 pts | +0.6 pts | −0.6 pts |
Single-parent households are relatively rare in Seneca: 4.4% of households, against 11.6% 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 Seneca
Renters in Seneca
| Period | Seneca | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 14.4% | 26.8% | 33.3% |
| 2010–14 | 17.8% | 28.2% | 35.6% |
| 2015–19 | 19.3% | 28.9% | 36.0% |
| 2020–24 | 16.8% | 28.3% | 34.8% |
| Change | +2.3 pts | +1.5 pts | +1.5 pts |
Seneca is largely a place of homeowners: only 16.8% of households rent, far below the national share of 34.8%. Owner-heavy areas like this tend to see less turnover. Among homeowners, 60.4% have no mortgage at all, well above the national share of 39.8%.
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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 12.7% | 8.7% | 11.4% |
| 2010–14 | 8.7% | 8.6% | 11.4% |
| 2015–19 | 17.4% | 9.4% | 11.1% |
| 2020–24 | 21.6% | 8.8% | 9.6% |
| Change | +8.9 pts | +0.1 pts | −1.8 pts |
Vacant homes make up 21.6% of the housing in Seneca, 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.
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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 1945 | 1965 | 1974 |
| 2010–14 | 1941 | 1967 | 1975 |
| 2015–19 | 1946 | 1969 | 1977 |
| 2020–24 | 1945 | 1971 | 1980 |
| Change | −0 | +6 | +6 |
The housing in Seneca is old by national standards: the median home dates to 1945, against 1980 for the U.S., so buyers will find more older houses, some of them due for updates.
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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | $704 | $669 | $965 |
| 2010–14 | $656 | $732 | $1,040 |
| 2015–19 | $527 | $821 | $1,213 |
| 2020–24 | $678 | $1,020 | $1,571 |
| Change | −$25 | +$351 | +$606 |
Rent in Seneca runs $678 a month at the median, utilities included, well below the U.S. median of $1,571. Rent takes 17.2% 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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 20.0% | 26.5% | 28.4% |
| 2010–14 | 15.7% | 27.9% | 29.6% |
| 2015–19 | 7.5% | 29.3% | 32.1% |
| 2020–24 | 18.9% | 32.3% | 35.6% |
| Change | −1.0 pts | +5.8 pts | +7.2 pts |
College degrees are relatively uncommon in Seneca: 18.9% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%.
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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 93.9% | 90.4% | 84.9% |
| 2010–14 | 94.5% | 91.4% | 86.1% |
| 2015–19 | 95.1% | 92.1% | 87.7% |
| 2020–24 | 95.5% | 93.0% | 89.3% |
| Change | +1.6 pts | +2.7 pts | +4.3 pts |
High school completion is high in Seneca: 95.5% 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 | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 4.8% | 5.2% | 8.1% |
| 2010–14 | 3.7% | 5.4% | 9.4% |
| 2015–19 | 4.8% | 3.7% | 5.6% |
| 2020–24 | 7.5% | 3.7% | 5.4% |
| Change | +2.7 pts | −1.5 pts | −2.7 pts |
Unemployment in Seneca runs well above the national rate: 7.5% of the labor force was out of work and looking, against 5.4%. 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).
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 | 2.15 | 47.7 | 4.4% | 16.8% | 21.6% | 1945 | $678 | 18.9% | 95.5% | 7.5% |
| Fenton | 2.09 | 46.7 | 3.3% | 17.2% | 22.6% | 1942 | $753 | 17.7% | 95.1% | 9.1% |
| Ringsted | 2.39 | 43.0 | 8.5% | 16.0% | 12.6% | 1946 | $661 | 22.8% | 98.1% | 1.5% |
| Swea City | 2.00 | 43.8 | 6.7% | 26.9% | 13.7% | 1954 | $604 | 17.5% | 92.7% | 3.6% |
| Armstrong | 2.00 | 52.8 | 9.7% | 20.0% | 14.2% | 1956 | $615 | 20.2% | 98.5% | 5.0% |
| Lone Rock | 2.32 | 48.8 | 4.2% | 14.4% | 13.5% | 1952 | $593 | 22.3% | 93.3% | 2.1% |
| Bancroft | 2.07 | 41.0 | 7.3% | 21.5% | 17.5% | 1954 | $639 | 13.6% | 95.8% | 0.8% |
| DePew | 2.58 | 38.1 | 2.2% | 13.6% | 20.0% | 1959 | $708 | 30.3% | 94.7% | 1.6% |
| Maple Hill | 2.38 | 43.7 | 3.1% | 5.9% | 16.7% | 1939 | $666 | 30.9% | 93.8% | 3.0% |
| Lotts Creek | 2.15 | 44.4 | 7.8% | 12.8% | 19.9% | 1946 | $780 | 17.6% | 95.6% | 2.5% |
| Burt | 2.36 | 49.5 | 3.9% | 13.0% | 10.7% | 1956 | $567 | 22.3% | 93.0% | 0.6% |
All figures 2020–24.
Cities with similar populations: Elmdale, KS · Zion, MO · Entry, WV · Enterline, PA · English Creek, NJ · Emory, VA · Emma, IL · Emerickville, PA · Elrod, IN · Elon, IA
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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