Population 53,219 · Census ACS 2020–24
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Population and households in Grundy County
Household size in Grundy County
| Period | Grundy County | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.74 | 2.79 | 2.69 | 2.68 |
| 2010–14 | 2.76 | 2.82 | 2.71 | 2.73 |
| 2015–19 | 2.60 | 2.75 | 2.66 | 2.71 |
| 2020–24 | 2.64 | 2.66 | 2.58 | 2.65 |
| Change | −0.10 | −0.12 | −0.11 | −0.03 |
At 2.64 people per household, Grundy County sits close to the national average of 2.65. Since 2006–10, household size has dropped from 2.74, a much bigger shift than nationally. Households are largest in the north and smallest in the west.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 36.9 | 36.8 | 37.6 | 37.7 |
| 2010–14 | 36.9 | 37.8 | 38.5 | 38.6 |
| 2015–19 | 38.7 | 38.9 | 39.6 | 39.6 |
| 2020–24 | 39.5 | 39.7 | 40.2 | 40.1 |
| Change | +2.6 | +3.0 | +2.6 | +2.3 |
Half of the people in Grundy County are younger than 39.5 and half are older, close to the national median of 40.1. Since 2006–10, the median age has climbed from 36.9, mirroring the country. Of Illinois' 102 counties, only nine are younger.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 11.4% | 12.0% | 11.7% | 12.3% |
| 2010–14 | 12.2% | 12.0% | 11.7% | 12.3% |
| 2015–19 | 10.7% | 11.2% | 11.1% | 11.6% |
| 2020–24 | 10.0% | 11.5% | 11.3% | 11.6% |
| Change | −1.4 pts | −0.5 pts | −0.4 pts | −0.6 pts |
Single parents head about one in ten households in Grundy County (10.0%), a little below the national share of 11.6%. Since 2006–10, the single-parent share has edged down 1.4 points, in line with the national trend.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 23.2% | 32.1% | 30.8% | 33.3% |
| 2010–14 | 25.0% | 34.8% | 33.1% | 35.6% |
| 2015–19 | 28.7% | 35.5% | 33.9% | 36.0% |
| 2020–24 | 25.6% | 34.5% | 32.9% | 34.8% |
| Change | +2.4 pts | +2.3 pts | +2.1 pts | +1.5 pts |
About a quarter of households in Grundy County rent their homes (25.6%), below the national share of 34.8%; the rest own. Among homeowners, 32.2% have no mortgage at all, below the national share of 39.8%. Rentals cluster in the west; owners are most common in the northeast. The renter share is up 2.4 points from 2006–10, in line with the national trend.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.0% | 9.8% | 10.0% | 11.4% |
| 2010–14 | 9.0% | 9.8% | 10.1% | 11.4% |
| 2015–19 | 6.3% | 8.9% | 9.8% | 11.1% |
| 2020–24 | 4.7% | 7.2% | 8.1% | 9.6% |
| Change | −3.3 pts | −2.6 pts | −1.9 pts | −1.8 pts |
Empty homes are scarce in Grundy County: just 4.7% sit vacant, compared with 9.6% nationally, a sign of a tight housing market. Vacancy is down 3.3 points from 2006–10, in line with the national trend. Few Illinois counties have a lower vacancy rate: only three of 102.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 1982 | 1966 | 1966 | 1974 |
| 2010–14 | 1982 | 1967 | 1967 | 1975 |
| 2015–19 | 1983 | 1967 | 1968 | 1977 |
| 2020–24 | 1986 | 1970 | 1970 | 1980 |
| Change | +5 | +4 | +4 | +6 |
The housing in Grundy County is younger than the country's: half of it was built after 1986, against 1980 nationally. The median year built has moved up from 1982 in 2006–10, a sign of steady new building. The newest homes are mostly in the northeast, the oldest in the center. Only three of Illinois' 102 counties have newer homes.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | $946 | $1,060 | $953 | $965 |
| 2010–14 | $1,069 | $1,142 | $1,028 | $1,040 |
| 2015–19 | $1,086 | $1,306 | $1,165 | $1,213 |
| 2020–24 | $1,242 | $1,602 | $1,428 | $1,571 |
| Change | +$296 | +$542 | +$475 | +$606 |
The median renter in Grundy County pays $1,242 a month for rent and utilities, well below the national median of $1,571. Rents are up $296 a month from 2006–10, a 31% rise, a slower climb than the nation's. The typical renter here spends 26.4% of household income on rent, comfortably under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally. The priciest rents are in the northeast; the most affordable are in the center.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 19.4% | 33.9% | 31.2% | 28.4% |
| 2010–14 | 21.8% | 35.2% | 32.4% | 29.6% |
| 2015–19 | 23.9% | 37.9% | 34.7% | 32.1% |
| 2020–24 | 23.7% | 40.9% | 37.7% | 35.6% |
| Change | +4.3 pts | +7.0 pts | +6.5 pts | +7.2 pts |
College degrees are relatively uncommon in Grundy County: 23.7% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%. The share with a degree has risen 4.3 points since 2006–10, in line with the national trend. Compared with other Illinois counties, though, Grundy County has a higher share of college graduates than most.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 90.8% | 85.6% | 86.3% | 84.9% |
| 2010–14 | 92.4% | 86.7% | 87.5% | 86.1% |
| 2015–19 | 93.3% | 88.4% | 89.1% | 87.7% |
| 2020–24 | 93.7% | 89.5% | 90.3% | 89.3% |
| Change | +2.9 pts | +3.9 pts | +4.0 pts | +4.3 pts |
High school completion in Grundy County is above the national rate: 93.7% of adults have a diploma, against 89.3%. The share with a diploma is up 2.9 points from 2006–10, as it has nationally. Grundy County has a higher share of high school graduates than the great majority of Illinois counties.
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 | Chicago area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 8.5% | 9.1% | 8.7% | 8.1% |
| 2010–14 | 8.8% | 10.8% | 10.2% | 9.4% |
| 2015–19 | 4.1% | 6.3% | 6.1% | 5.6% |
| 2020–24 | 4.5% | 6.3% | 6.0% | 5.4% |
| Change | −4.0 pts | −2.8 pts | −2.7 pts | −2.7 pts |
Unemployment in Grundy County runs below the national rate: 4.5% of the labor force was out of work and looking, against 5.4% nationally. Unemployment has fallen 4.0 points since 2006–10, in line with the national trend. 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).
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 | 2.64 | 39.5 | 10.0% | 25.6% | 4.7% | 1986 | $1,242 | 23.7% | 93.7% | 4.5% |
| LaSalle County | 2.37 | 42.4 | 12.0% | 25.6% | 9.3% | 1966 | $1,011 | 20.5% | 92.1% | 5.7% |
| Putnam County | 2.31 | 45.3 | 10.9% | 18.5% | 16.3% | 1971 | $817 | 21.9% | 94.2% | 4.1% |
| Bureau County | 2.33 | 44.0 | 10.1% | 23.9% | 10.6% | 1957 | $864 | 21.6% | 91.3% | 4.3% |
| Starke County | 2.70 | 41.7 | 9.3% | 17.0% | 19.0% | 1974 | $899 | 13.1% | 87.7% | 3.5% |
| Henry County | 2.42 | 44.0 | 11.2% | 20.1% | 10.4% | 1960 | $933 | 24.6% | 92.0% | 5.1% |
| Marshall County | 2.63 | 41.0 | 11.2% | 23.6% | 11.3% | 1971 | $1,011 | 20.6% | 84.3% | 2.6% |
| Rock Island County | 2.29 | 41.1 | 13.3% | 30.3% | 7.8% | 1961 | $971 | 24.8% | 90.7% | 5.6% |
| Mercer County | 2.35 | 43.6 | 7.6% | 16.2% | 10.5% | 1961 | $775 | 21.1% | 93.9% | 3.0% |
| Kosciusko County | 2.55 | 39.6 | 10.3% | 23.0% | 14.5% | 1980 | $1,056 | 25.3% | 87.3% | 2.7% |
| Muscatine County | 2.43 | 40.0 | 13.7% | 26.1% | 7.4% | 1968 | $1,008 | 23.5% | 89.7% | 3.0% |
All figures 2020–24.
Counties with similar populations: Hawkins County, TN · Edgecombe County, NC · Elko County, NV · Fremont County, CO · Garfield County, CO · Genesee County, NY · Granville County, NC · Hardin County, TX · Harrisonburg City, VA · Eddy County, NM
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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