Irmo, SC Demographics

A map of Irmo's Population by Race

Irmo, South Carolina has an estimated population of 11,813, a slight increase from the 11,569 recorded in the 2020 Census. The population is 58.1% White, 27.4% Black, 5.6% Hispanic, 4.5% Multiracial, 4.3% Asian, and 0.1% Native American/Other. This demographic dot map shows the population of Irmo, with one dot drawn for each person counted by the Census, color-coded by race.

Irmo has become slightly less racially diverse since the 2020 Census. It is more diverse than South Carolina overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Irmo, that probability was 58.9% in 2020 and 58.0% in the most recent ACS estimates.

Irmo is ranked the 55th most populous place in South Carolina, out of 475 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Irmo was ranked the 54th most populous place in the 2020 Census.

Irmo's White Population

6,868 residents of Irmo, or 58.1% of the population, identify as White. The share of White residents in Irmo is slightly lower than in South Carolina overall, where 61.9% of the population is White. Irmo ranks 272nd statewide in terms of White residents as a share of the population, out of 475 places.

Since the 2020 Census, Irmo's White population has grown by an estimated 6.2%. White residents' share of Irmo's population has increased from 55.9% to 58.1%.

Irmo is more White than neighboring Seven Oaks (57.7% White), and St. Andrews (22.2% White). Irmo is less White than neighboring Lake Murray of Richland (92.2% White), Lexington (73.3% White), and Oak Grove (67.4% White).

Irmo's Black Population

3,234 residents of Irmo, or 27.4% of the population, identify as Black. The share of Black residents in Irmo is slightly higher than in South Carolina overall, where 24.6% of the population is Black. Irmo ranks 208th statewide in terms of Black residents as a share of the population, out of 475 places.

Since the 2020 Census, Irmo's Black population has declined by an estimated 8.1%. Black residents' share of Irmo's population has decreased from 30.4% to 27.4%.

Irmo is more Black than neighboring Lake Murray of Richland (6.1% Black), Lexington (11.1% Black), and Oak Grove (15.6% Black). Irmo is less Black than neighboring Seven Oaks (31.8% Black), and St. Andrews (68.5% Black).

Irmo's Asian Population

504 residents of Irmo, or 4.3% of the population, identify as Asian. The share of Asian residents in Irmo is slightly higher than in South Carolina overall, where 1.7% of the population is Asian. Irmo ranks 68th statewide in terms of Asian residents as a share of the population, out of 475 places.

Since the 2020 Census, Irmo's Asian population has grown by an estimated 109.1%. Asian residents' share of Irmo's population has increased from 2.1% to 4.3%.

Irmo is more Asian than neighboring Lake Murray of Richland (0% Asian), Seven Oaks (1.8% Asian), St. Andrews (2.2% Asian), and Oak Grove (1.5% Asian). Irmo is less Asian than neighboring Lexington (6% Asian).

Irmo's Hispanic Population

667 residents of Irmo, or 5.6% of the population, identify as Hispanic. The share of Hispanic residents in Irmo is comparable to the share in South Carolina overall, where 7.4% of the population is Hispanic. Irmo ranks 157th statewide in terms of Hispanic residents as a share of the population, out of 475 places.

Since the 2020 Census, Irmo's Hispanic population has remained roughly the same. Hispanic residents' share of Irmo's population has remained roughly unchanged at 5.6%.

Irmo is more Hispanic than neighboring Lake Murray of Richland (1.1% Hispanic), Seven Oaks (4.9% Hispanic), and St. Andrews (3.6% Hispanic). Irmo is less Hispanic than neighboring Lexington (6.6% Hispanic), and Oak Grove (12.9% Hispanic).

Irmo's Native American/Other Population

13 residents of Irmo, or 0.1% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Irmo is comparable to the share in South Carolina overall, where 0.7% of the population is Native American/Other. Irmo ranks 56th statewide in terms of Native American/Other residents as a share of the population, out of 475 places.

Since the 2020 Census, Irmo's Native American/Other population has declined by an estimated 91.0%. Native American/Other residents' share of Irmo's population has decreased from 1.3% to 0.1%.

Irmo is more Native American/Other than neighboring Lake Murray of Richland (0% Native American/Other). Irmo is less Native American/Other than neighboring Seven Oaks (1.7% Native American/Other), St. Andrews (0.2% Native American/Other), Lexington (0.4% Native American/Other), and Oak Grove (0.4% Native American/Other).

Irmo's Multiracial Population

527 residents of Irmo, or 4.5% of the population, identify as Multiracial. The share of Multiracial residents in Irmo is comparable to the share in South Carolina overall, where 3.7% of the population is Multiracial. Irmo ranks 103rd statewide in terms of Multiracial residents as a share of the population, out of 475 places.

Since the 2020 Census, Irmo's Multiracial population has declined by an estimated 1.7%. Multiracial residents' share of Irmo's population has remained roughly unchanged at 4.5%.

Irmo is more Multiracial than neighboring Lake Murray of Richland (0.6% Multiracial), Seven Oaks (2.2% Multiracial), St. Andrews (3.3% Multiracial), Lexington (2.6% Multiracial), and Oak Grove (2.2% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.