Population 36,537 · Census ACS 2020–24
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Population and households in Irmo
Household size in Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.80 | 2.51 | 2.54 | 2.68 |
| 2010–14 | 2.84 | 2.55 | 2.59 | 2.73 |
| 2015–19 | 2.84 | 2.55 | 2.57 | 2.71 |
| 2020–24 | 2.71 | 2.46 | 2.50 | 2.65 |
| Change | −0.09 | −0.05 | −0.04 | −0.03 |
Households in Irmo average 2.71 people, about the same as the country as a whole (2.65). The typical household here is bigger than in the wider Columbia area, where it has 2.46 people. Since 2006–10, household size has edged down from 2.80, in line with the national trend.
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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 35.3 | 37.1 | 38.3 | 37.7 |
| 2010–14 | 38.0 | 37.8 | 39.3 | 38.6 |
| 2015–19 | 38.3 | 38.6 | 40.6 | 39.6 |
| 2020–24 | 41.3 | 39.4 | 41.2 | 40.1 |
| Change | +6.0 | +2.3 | +2.9 | +2.3 |
Half of the people in Irmo are younger than 41.3 and half are older, close to the national median of 40.1. The population here is older than in the wider Columbia area, where the median age is 39.4. The median age has climbed from 35.3 in 2006–10, mirroring the country.
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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 13.5% | 13.2% | 13.0% | 12.3% |
| 2010–14 | 12.9% | 13.4% | 13.0% | 12.3% |
| 2015–19 | 11.6% | 12.9% | 11.8% | 11.6% |
| 2020–24 | 12.3% | 12.9% | 11.7% | 11.6% |
| Change | −1.2 pts | −0.3 pts | −1.3 pts | −0.6 pts |
Single parents head about one in eight households in Irmo (12.3%), close to the national share of 11.6%. The single-parent share is down 1.2 points from 2006–10, 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 Irmo
Renters in Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 14.9% | 31.2% | 30.1% | 33.3% |
| 2010–14 | 15.0% | 32.8% | 31.4% | 35.6% |
| 2015–19 | 19.2% | 32.1% | 30.6% | 36.0% |
| 2020–24 | 16.8% | 30.6% | 28.1% | 34.8% |
| Change | +2.0 pts | −0.6 pts | −2.0 pts | +1.5 pts |
Irmo 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, 31.3% have no mortgage at all, below the national share of 39.8%. The renter share is up 2.0 points from 2006–10, mirroring the country.
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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.0% | 10.7% | 14.2% | 11.4% |
| 2010–14 | 7.3% | 12.0% | 14.2% | 11.4% |
| 2015–19 | 5.9% | 11.8% | 13.3% | 11.1% |
| 2020–24 | 5.0% | 10.3% | 11.8% | 9.6% |
| Change | −1.0 pts | −0.4 pts | −2.5 pts | −1.8 pts |
Only 5.0% of homes in Irmo are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Vacancy has edged down 1.0 points since 2006–10, as it has nationally. Only six of the 172 South Carolina cities with 5,000+ people 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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 1992 | 1984 | 1984 | 1974 |
| 2010–14 | 1993 | 1985 | 1985 | 1975 |
| 2015–19 | 1994 | 1986 | 1987 | 1977 |
| 2020–24 | 1995 | 1990 | 1991 | 1980 |
| Change | +2 | +6 | +7 | +6 |
Much of the housing in Irmo is relatively new: half of its homes were built after 1995, compared with 1980 for the U.S. as a whole. Newer construction is concentrated in the northwest, while the south 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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,089 | $831 | $780 | $965 |
| 2010–14 | $1,102 | $908 | $859 | $1,040 |
| 2015–19 | $1,321 | $1,021 | $984 | $1,213 |
| 2020–24 | $1,738 | $1,285 | $1,294 | $1,571 |
| Change | +$648 | +$453 | +$514 | +$606 |
Rent in Irmo runs $1,738 a month at the median, utilities included, above the U.S. median of $1,571. Rents are up $648 a month from 2006–10, a 59% rise, a slower climb than the nation's. Rent takes 28.0% of the typical renter's income, just under the 30% mark often used to define affordable rent. Rents run highest in the northwest and lowest in the south.
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 Irmo
Bachelor's degrees in Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 45.2% | 31.5% | 25.2% | 28.4% |
| 2010–14 | 45.3% | 31.8% | 26.5% | 29.6% |
| 2015–19 | 43.6% | 34.1% | 28.9% | 32.1% |
| 2020–24 | 46.1% | 35.9% | 32.6% | 35.6% |
| Change | +0.9 pts | +4.4 pts | +7.4 pts | +7.2 pts |
Irmo is highly educated: 46.1% of adults 25 and older hold at least a bachelor's degree, far above the national share of 35.6%. Since 2006–10, the share with a degree has edged up 0.9 points, a smaller shift than nationally. College graduates are most concentrated in the north and least in the center.
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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 95.3% | 88.1% | 84.0% | 84.9% |
| 2010–14 | 95.9% | 88.7% | 85.7% | 86.1% |
| 2015–19 | 96.6% | 90.2% | 87.8% | 87.7% |
| 2020–24 | 95.3% | 91.4% | 90.2% | 89.3% |
| Change | +0.0 pts | +3.3 pts | +6.2 pts | +4.3 pts |
High school completion is high in Irmo: 95.3% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. Only 16 of the 172 South Carolina cities with 5,000+ people have a higher share of high school graduates.
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 Irmo
| Period | Irmo | Columbia area | South Carolina | U.S. |
|---|---|---|---|---|
| 2006–10 | 3.8% | 7.6% | 9.1% | 8.1% |
| 2010–14 | 4.7% | 9.7% | 10.6% | 9.4% |
| 2015–19 | 4.2% | 6.0% | 5.8% | 5.6% |
| 2020–24 | 5.0% | 5.4% | 4.9% | 5.4% |
| Change | +1.2 pts | −2.2 pts | −4.2 pts | −2.7 pts |
At 5.0%, unemployment in Irmo is close to the national rate of 5.4%. Unemployment has edged up 1.2 points since 2006–10, even as the national rate fell. 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).
Irmo 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Irmo | 2.71 | 41.3 | 12.3% | 16.8% | 5.0% | 1995 | $1,738 | 46.1% | 95.3% | 5.0% |
| Ballentine | 2.87 | 45.1 | 5.6% | 15.7% | 5.3% | 2002 | $1,662 | 53.8% | 97.2% | 0.2% |
| Lake Murray of Richland | 2.34 | 49.4 | 8.5% | 31.5% | 4.3% | 2003 | $1,645 | 48.8% | 97.1% | 0.0% |
| White Rock | 2.64 | 43.9 | 7.5% | 4.9% | 3.8% | 2000 | $1,708 | 51.3% | 94.2% | 1.2% |
| Seven Oaks | 2.35 | 41.8 | 14.3% | 38.1% | 7.0% | 1975 | $1,296 | 36.9% | 94.9% | 5.5% |
| Richtex | 2.20 | 47.2 | 13.2% | 22.0% | 12.7% | 1990 | $1,245 | 30.8% | 92.2% | 15.9% |
| St. Andrews | 1.99 | 33.1 | 15.4% | 71.5% | 11.0% | 1979 | $1,148 | 28.1% | 91.7% | 7.9% |
| Chapin | 2.57 | 45.6 | 5.6% | 9.4% | 8.0% | 2003 | $1,807 | 49.3% | 95.9% | 3.0% |
| Peak | 2.51 | 43.9 | 11.1% | 9.6% | 12.1% | 1994 | $1,466 | 38.1% | 94.0% | 7.1% |
| Hollywood Hills | 2.80 | 41.7 | 12.3% | 6.6% | 7.7% | 1997 | $679 | 42.0% | 99.0% | 3.7% |
| Rion | 2.34 | 51.4 | 6.0% | 14.1% | 9.5% | 1988 | $1,271 | 12.9% | 88.7% | 5.4% |
All figures 2020–24.
Cities with similar populations: Wildomar, CA · Moca, PR · Palmetto, FL · Okeechobee, FL · Oildale, CA · Odenton, MD · Oakville, MO · Oak Creek, WI · Newhall, CA · Newburgh, IN
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 Irmo. 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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