Population 15,266 · Census ACS 2020–24
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Population and households in Clark County
Household size in Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 2.40 | 2.69 | 2.68 |
| 2010–14 | 2.39 | 2.71 | 2.73 |
| 2015–19 | 2.30 | 2.66 | 2.71 |
| 2020–24 | 2.36 | 2.58 | 2.65 |
| Change | −0.04 | −0.11 | −0.03 |
Clark County is a place of small households, averaging 2.36 people against 2.65 for the U.S., which points to many singles, couples and roommates and relatively few children. Since 2006–10, household size has edged down from 2.40, as it has nationally. Households are largest in the southeast and smallest in the north.
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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 41.8 | 37.6 | 37.7 |
| 2010–14 | 42.7 | 38.5 | 38.6 |
| 2015–19 | 43.9 | 39.6 | 39.6 |
| 2020–24 | 43.1 | 40.2 | 40.1 |
| Change | +1.3 | +2.6 | +2.3 |
The median resident of Clark County is 43.1 years old, older than the national median of 40.1. The median age has climbed from 41.8 in 2006–10, in line with the national trend. Residents skew youngest in the southeast and oldest in the north.
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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 11.8% | 11.7% | 12.3% |
| 2010–14 | 10.2% | 11.7% | 12.3% |
| 2015–19 | 13.8% | 11.1% | 11.6% |
| 2020–24 | 13.9% | 11.3% | 11.6% |
| Change | +2.1 pts | −0.4 pts | −0.6 pts |
Single parents head about one in seven households in Clark County (13.9%), above the national share of 11.6%. The single-parent share has risen 2.1 points since 2006–10, even as the national share fell. Of Illinois' 102 counties, only three have a higher share of single-parent households.
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 Clark County
Renters in Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 22.9% | 30.8% | 33.3% |
| 2010–14 | 25.1% | 33.1% | 35.6% |
| 2015–19 | 23.4% | 33.9% | 36.0% |
| 2020–24 | 19.7% | 32.9% | 34.8% |
| Change | −3.2 pts | +2.1 pts | +1.5 pts |
Only 19.7% of households in Clark County rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. About half of owners (48.6%) have paid off their mortgages, above the national share of 39.8%. The renter share has fallen 3.2 points since 2006–10, even as the national share rose.
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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 14.9% | 10.0% | 11.4% |
| 2010–14 | 14.5% | 10.1% | 11.4% |
| 2015–19 | 13.9% | 9.8% | 11.1% |
| 2020–24 | 12.1% | 8.1% | 9.6% |
| Change | −2.8 pts | −1.9 pts | −1.8 pts |
Vacancy runs a little high in Clark County: 12.1% of homes are empty, against 9.6% nationally. The count includes vacation homes and homes between owners or tenants, not just abandoned ones. Since 2006–10, vacancy has fallen 2.8 points, mirroring the country.
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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 1961 | 1966 | 1974 |
| 2010–14 | 1968 | 1967 | 1975 |
| 2015–19 | 1966 | 1968 | 1977 |
| 2020–24 | 1970 | 1970 | 1980 |
| Change | +9 | +4 | +6 |
Clark County is a place of older homes: half were built before 1970, 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 1961 in 2006–10, a sign of steady new building. Newer construction is concentrated in the southeast, while the southwest 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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | $619 | $953 | $965 |
| 2010–14 | $650 | $1,028 | $1,040 |
| 2015–19 | $757 | $1,165 | $1,213 |
| 2020–24 | $886 | $1,428 | $1,571 |
| Change | +$267 | +$475 | +$606 |
A typical rental in Clark County costs $886 a month with utilities, well below the national median of $1,571. Rents are up $267 a month from 2006–10, a 43% rise, a slower climb than the nation's. The typical renter here spends 32.0% of household income on rent, just over the 30% mark often used to define affordable rent. The priciest rents are in the southeast; the most affordable are in the west.
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 Clark County
Bachelor's degrees in Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 16.6% | 31.2% | 28.4% |
| 2010–14 | 18.7% | 32.4% | 29.6% |
| 2015–19 | 20.2% | 34.7% | 32.1% |
| 2020–24 | 25.1% | 37.7% | 35.6% |
| Change | +8.5 pts | +6.5 pts | +7.2 pts |
College degrees are relatively uncommon in Clark County: 25.1% 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 8.5 points since 2006–10, in line with the national trend. College graduates are most concentrated in the northeast and least in the west.
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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 87.8% | 86.3% | 84.9% |
| 2010–14 | 89.5% | 87.5% | 86.1% |
| 2015–19 | 92.9% | 89.1% | 87.7% |
| 2020–24 | 92.6% | 90.3% | 89.3% |
| Change | +4.8 pts | +4.0 pts | +4.3 pts |
High school completion in Clark County is above the national rate: 92.6% of adults have a diploma or equivalent, against 89.3%. The share with a diploma is up 4.8 points from 2006–10, as it has nationally.
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 Clark County
| Period | Clark County | Illinois | U.S. |
|---|---|---|---|
| 2006–10 | 7.0% | 8.7% | 8.1% |
| 2010–14 | 8.3% | 10.2% | 9.4% |
| 2015–19 | 5.7% | 6.1% | 5.6% |
| 2020–24 | 3.5% | 6.0% | 5.4% |
| Change | −3.4 pts | −2.7 pts | −2.7 pts |
Unemployment in Clark County runs below the national rate: 3.5% of the labor force was out of work and looking, against 5.4% nationally. Unemployment has fallen 3.4 points since 2006–10, as it has nationally. 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).
Clark 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Clark County | 2.36 | 43.1 | 13.9% | 19.7% | 12.1% | 1970 | $886 | 25.1% | 92.6% | 3.5% |
| Vigo County | 2.38 | 37.3 | 13.2% | 38.3% | 11.6% | 1970 | $961 | 27.4% | 90.9% | 5.8% |
| Cumberland County | 2.48 | 44.5 | 7.0% | 15.8% | 10.2% | 1970 | $847 | 19.1% | 94.2% | 1.4% |
| Coles County | 2.11 | 40.6 | 11.3% | 39.6% | 10.2% | 1969 | $806 | 28.4% | 91.4% | 5.7% |
| Clay County | 2.54 | 42.0 | 12.4% | 19.1% | 10.8% | 1974 | $931 | 20.2% | 90.4% | 3.4% |
| Owen County | 2.51 | 44.9 | 10.4% | 18.6% | 12.5% | 1982 | $854 | 16.7% | 87.7% | 2.9% |
| Shelby County | 2.34 | 44.8 | 10.4% | 21.6% | 12.3% | 1966 | $804 | 18.5% | 94.9% | 3.2% |
| Brown County | 2.36 | 49.1 | 6.5% | 13.4% | 18.9% | 1984 | $975 | 26.2% | 94.4% | 2.2% |
| Bartholomew County | 2.53 | 39.2 | 10.7% | 30.7% | 7.6% | 1981 | $1,154 | 33.4% | 91.7% | 4.1% |
| Decatur County | 2.43 | 40.9 | 10.2% | 23.9% | 9.3% | 1973 | $881 | 20.0% | 91.2% | 2.4% |
| Greene County | 2.62 | 43.5 | 10.1% | 21.8% | 22.8% | 1958 | $797 | 18.4% | 91.4% | 4.9% |
All figures 2020–24.
Counties with similar populations: Mercer County, IL · Martin County, IN · Martin County, KY · Martinsville City, VA · Mason County, IL · Massac County, IL · Mathews County, VA · Maunabo Municipio, PR · McCormick County, SC · McCreary County, KY
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 Clark 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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