Population 12,384 · Census ACS 2020–24
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Population and households in Grundy County
Household size in Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 2.44 | 2.44 | 2.68 |
| 2010–14 | 2.42 | 2.45 | 2.73 |
| 2015–19 | 2.37 | 2.43 | 2.71 |
| 2020–24 | 2.40 | 2.43 | 2.65 |
| Change | −0.04 | −0.01 | −0.03 |
Households in Grundy County are small: just 2.40 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 edged down from 2.44, mirroring the country.
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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 43.1 | 38.8 | 37.7 |
| 2010–14 | 42.8 | 39.3 | 38.6 |
| 2015–19 | 43.6 | 39.7 | 39.6 |
| 2020–24 | 42.5 | 39.8 | 40.1 |
| Change | −0.6 | +1.0 | +2.3 |
The median resident of Grundy County is 42.5 years old, a bit older than the national median of 40.1. Since 2006–10, the median age has edged down from 43.1, even as the national median rose. The youngest areas are in the northeast, the oldest in the southwest.
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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 5.1% | 9.5% | 12.3% |
| 2010–14 | 7.9% | 9.9% | 12.3% |
| 2015–19 | 7.8% | 10.0% | 11.6% |
| 2020–24 | 7.8% | 10.0% | 11.6% |
| Change | +2.8 pts | +0.6 pts | −0.6 pts |
Single-parent households are relatively rare in Grundy County: 7.8% of households, against 11.6% nationally. The single-parent share is up 2.8 points from 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 Grundy County
Renters in Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 19.3% | 26.8% | 33.3% |
| 2010–14 | 19.2% | 28.2% | 35.6% |
| 2015–19 | 18.4% | 28.9% | 36.0% |
| 2020–24 | 15.5% | 28.3% | 34.8% |
| Change | −3.8 pts | +1.5 pts | +1.5 pts |
Only 15.5% of households in Grundy County rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. Just over four in ten owners (41.9%) have paid off their mortgages, about the same as nationally. Since 2006–10, the renter share has fallen 3.8 points, even as the national share rose. Only one other Iowa county has a lower share of renters.
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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 10.4% | 8.7% | 11.4% |
| 2010–14 | 7.1% | 8.6% | 11.4% |
| 2015–19 | 7.4% | 9.4% | 11.1% |
| 2020–24 | 6.7% | 8.8% | 9.6% |
| Change | −3.7 pts | +0.1 pts | −1.8 pts |
Fewer homes sit empty in Grundy County than nationally: 6.7%, against 9.6% for the U.S. Since 2006–10, vacancy has fallen 3.7 points, in line with the national trend. Of Iowa's 99 counties, only seven have a lower vacancy rate.
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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 1954 | 1965 | 1974 |
| 2010–14 | 1956 | 1967 | 1975 |
| 2015–19 | 1955 | 1969 | 1977 |
| 2020–24 | 1961 | 1971 | 1980 |
| Change | +7 | +6 | +6 |
Grundy County is a place of older homes: half were built before 1961, while the national median is 1980. That means established neighborhoods, and more houses that may need updating. The median year built has moved up from 1954 in 2006–10, a sign of steady new building. Newer construction is concentrated in the northeast, while the southeast 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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | $550 | $669 | $965 |
| 2010–14 | $631 | $732 | $1,040 |
| 2015–19 | $691 | $821 | $1,213 |
| 2020–24 | $859 | $1,020 | $1,571 |
| Change | +$309 | +$351 | +$606 |
The median renter in Grundy County pays $859 a month for rent and utilities, well below the national median of $1,571. Rents are up $309 a month from 2006–10, a 56% rise, a slower climb than the nation's. Rent takes 23.1% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent. The priciest rents are in the southeast; the most affordable are in the northwest.
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 Grundy County
Bachelor's degrees in Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 22.1% | 26.5% | 28.4% |
| 2010–14 | 20.8% | 27.9% | 29.6% |
| 2015–19 | 28.1% | 29.3% | 32.1% |
| 2020–24 | 28.3% | 32.3% | 35.6% |
| Change | +6.1 pts | +5.8 pts | +7.2 pts |
Nearly three in ten adults 25 and older in Grundy County (28.3%) have a bachelor's degree or higher, below the national share of 35.6%. The share with a degree has risen 6.1 points since 2006–10, mirroring the country. College graduates are most concentrated in the northeast and least in the northwest.
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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 91.3% | 90.4% | 84.9% |
| 2010–14 | 94.1% | 91.4% | 86.1% |
| 2015–19 | 94.4% | 92.1% | 87.7% |
| 2020–24 | 96.7% | 93.0% | 89.3% |
| Change | +5.4 pts | +2.7 pts | +4.3 pts |
High school completion is high in Grundy County: 96.7% 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 5.4 points from 2006–10, mirroring the country. Few Iowa counties have a higher share of high school graduates: only three of 99.
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 Grundy County
| Period | Grundy County | Iowa | U.S. |
|---|---|---|---|
| 2006–10 | 2.8% | 5.2% | 8.1% |
| 2010–14 | 4.9% | 5.4% | 9.4% |
| 2015–19 | 2.2% | 3.7% | 5.6% |
| 2020–24 | 1.9% | 3.7% | 5.4% |
| Change | −0.9 pts | −1.5 pts | −2.7 pts |
Unemployment in Grundy County has been low: just 1.9% of the labor force was out of work and looking, well below the national rate of 5.4%. Since 2006–10, unemployment has edged down 0.9 points, a smaller shift than 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).
Grundy County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Grundy County | 2.40 | 42.5 | 7.8% | 15.5% | 6.7% | 1961 | $859 | 28.3% | 96.7% | 1.9% |
| Black Hawk County | 2.37 | 37.0 | 10.5% | 33.8% | 8.2% | 1968 | $1,030 | 32.7% | 93.3% | 4.5% |
| Hardin County | 2.32 | 43.8 | 7.8% | 26.4% | 12.3% | 1955 | $770 | 22.6% | 92.8% | 4.8% |
| Buchanan County | 2.53 | 40.7 | 10.2% | 17.9% | 7.6% | 1972 | $973 | 22.2% | 93.6% | 2.8% |
| Hamilton County | 2.36 | 42.8 | 8.9% | 26.6% | 9.3% | 1950 | $869 | 22.0% | 94.3% | 5.5% |
| Delaware County | 2.36 | 45.3 | 7.3% | 20.4% | 10.4% | 1967 | $739 | 22.3% | 93.3% | 1.7% |
| Webster County | 2.25 | 39.2 | 9.8% | 29.7% | 12.3% | 1958 | $797 | 22.0% | 93.5% | 4.9% |
| Calhoun County | 2.30 | 43.9 | 7.7% | 19.5% | 16.2% | 1957 | $743 | 21.8% | 92.9% | 2.4% |
| Dubuque County | 2.38 | 40.0 | 7.9% | 26.7% | 6.0% | 1974 | $1,015 | 33.3% | 93.9% | 3.5% |
| Sac County | 2.22 | 46.7 | 8.4% | 22.0% | 15.2% | 1954 | $737 | 22.1% | 92.7% | 4.0% |
| Jo Daviess County | 2.12 | 50.8 | 8.7% | 19.6% | 17.5% | 1969 | $859 | 28.9% | 93.2% | 3.6% |
All figures 2020–24.
Counties with similar populations: Crawford County, MI · Cumberland County, VA · Cumberland County, KY · Cumberland County, IL · Crowley County, CO · Cross County, AR · Crosby County, TX · Crook County, WY · Crockett County, TX · Crockett County, TN
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 Grundy County. 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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