Irmo vs St. Andrews

A side-by-side comparison of Irmo and St. Andrews: population, income, housing, and more.

Irmo and St. Andrews are places in South Carolina. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

St. Andrews has the higher population (20,953 vs 11,799 in Irmo). Irmo has the higher median household income ($85,137 vs $45,321 in St. Andrews). Irmo has the higher median home value ($193,100 vs $146,700 in St. Andrews).

Population, income & housing

	Irmo	St. Andrews
Population	11,799	20,953
Median age	39.5 yrs	31.7 yrs
Median household income	$85,137	$45,321
Median home value	$193,100	$146,700
Median gross rent	$1,412	$1,060
Housing units	4,996	11,730
Homeownership rate	80.7%	29.6%
Bachelor's degree or higher	37.3%	25.8%
Unemployment rate	8.3%	8.3%

Trends (ACS 5-year, 2019–2023)

	Irmo	St. Andrews
Population	12,215 → 11,799 (-3.4%)	20,990 → 20,953 (-0.2%)
Median household income	$66,313 → $85,137 (+28.4%)	$37,042 → $45,321 (+22.4%)
Median home value	$125,000 → $193,100 (+54.5%)	$100,500 → $146,700 (+46.0%)
Median gross rent	$1,126 → $1,412 (+25.4%)	$875 → $1,060 (+21.1%)

Irmo

Population

12,21511,799

Median household income

$66,313$85,137

Median home value

$125,000$193,100

Median gross rent

$1,126$1,412

St. Andrews

Population

20,99020,953

Median household income

$37,042$45,321

Median home value

$100,500$146,700

Median gross rent

$875$1,060

Age & race/ethnicity

Age distribution (share)

	Irmo	St. Andrews
Under 5	4.5%	7.8%
5 to 17	17.1%	14.6%
18 to 24	6.8%	12.2%
25 to 34	17.0%	20.5%
35 to 44	12.0%	12.7%
45 to 54	13.5%	9.1%
55 to 64	14.3%	10.7%
65 to 74	8.8%	8.0%
75 and over	6.1%	4.3%

Race & ethnicity (share)

	Irmo	St. Andrews
White (non-Hispanic)	61.3%	20.9%
Black or African American	29.3%	68.1%
American Indian & Alaska Native	0.0%	0.0%
Asian	2.5%	2.5%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.3%
Two or more races	4.1%	4.1%
Hispanic or Latino	2.8%	4.0%

Educational attainment (age 25+)

Share of adults 25+

	Irmo	St. Andrews
No high school diploma	4.1%	8.4%
High school graduate	20.6%	31.3%
Some college or associate's	37.9%	34.4%
Bachelor's degree	26.3%	15.6%
Graduate or professional degree	11.1%	10.2%

Commute to work

How workers get to work (share)

	Irmo	St. Andrews
Drove alone	76.2%	78.0%
Carpooled	9.8%	6.1%
Public transit	0.0%	1.4%
Walked	0.3%	1.5%
Bicycle	0.0%	0.0%
Worked from home	13.7%	9.7%
Other means	0.1%	3.3%

Housing

Units in structure (share)

	Irmo	St. Andrews
1-unit, detached	89.9%	30.6%
1-unit, attached	4.5%	7.1%
2 to 4 units	1.8%	16.5%
5 to 19 units	1.7%	36.9%
20 or more units	1.1%	8.6%
Mobile home & other	1.1%	0.3%

Poverty & households

	Irmo	St. Andrews
Poverty rate	8.1%	23.5%
Average household size	2.48	2.05
Mean commute (minutes)	25	21
Median year structure built	1984	1978