Mason County Demographics

A map of Mason County's Population by Race

Mason County, Illinois has an estimated population of 12,745, a slight decrease from the 13,086 recorded in the 2020 Census. The population is 94.2% White, 3.1% Multiracial, 1.6% Hispanic, 0.5% Black, 0.4% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Mason County, with one dot drawn for each person counted by the Census, color-coded by race.

Mason is about as racially diverse as it was in the 2020 Census. It is considerably less diverse than Illinois overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Mason County, that probability was 10.9% in 2020 and 11.2% in the most recent ACS estimates.

Mason County is ranked the 82nd most populous county in Illinois, out of 102 counties. Mason County was ranked the 81st most populous county in the 2020 Census.

Mason County's White Population

12,000 residents of Mason County, or 94.2% of the population, identify as White. The share of White residents in Mason County is significantly higher than in Illinois overall, where 58.1% of the population is White. Mason County ranks 16th statewide in terms of White residents as a share of the population, out of 102 counties.

Since the 2020 Census, Mason County's White population has declined by an estimated 2.7%. White residents' share of Mason County's population has remained roughly unchanged at 94.2%.

Mason County is more White than neighboring Fulton County (91.7% White), Cass County (69.9% White), Tazewell County (91.9% White), and Sangamon County (77.3% White). Mason County is less White than neighboring Menard County (94.8% White).

Mason County's Black Population

66 residents of Mason County, or 0.5% of the population, identify as Black. The share of Black residents in Mason County is considerably lower than in Illinois overall, where 13.3% of the population is Black. Mason County ranks 89th statewide in terms of Black residents as a share of the population, out of 102 counties.

Since the 2020 Census, Mason County's Black population has grown by an estimated 34.7%. Black residents' share of Mason County's population has remained roughly unchanged at 0.5%.

Mason County is less Black than neighboring Fulton County (2.8% Black), Cass County (4% Black), Tazewell County (1.6% Black), and Sangamon County (12.5% Black).

Mason County's Asian Population

52 residents of Mason County, or 0.4% of the population, identify as Asian. The share of Asian residents in Mason County is lower than in Illinois overall, where 5.9% of the population is Asian. Mason County ranks 95th statewide in terms of Asian residents as a share of the population, out of 102 counties.

Since the 2020 Census, Mason County's Asian population has grown by an estimated 100.0%. Asian residents' share of Mason County's population has remained roughly unchanged at 0.4%.

Mason County is more Asian than neighboring Menard County (0.3% Asian), and Fulton County (0.3% Asian). Mason County is less Asian than neighboring Cass County (0.9% Asian), Tazewell County (1% Asian), and Sangamon County (2.3% Asian).

Mason County's Hispanic Population

205 residents of Mason County, or 1.6% of the population, identify as Hispanic. The share of Hispanic residents in Mason County is significantly lower than in Illinois overall, where 18.8% of the population is Hispanic. Mason County ranks 88th statewide in terms of Hispanic residents as a share of the population, out of 102 counties.

Since the 2020 Census, Mason County's Hispanic population has grown by an estimated 11.4%. Hispanic residents' share of Mason County's population has remained roughly unchanged at 1.6%.

Mason County is less Hispanic than neighboring Menard County (1.7% Hispanic), Fulton County (2.5% Hispanic), Cass County (22.9% Hispanic), Tazewell County (2.7% Hispanic), and Sangamon County (2.9% Hispanic).

Mason County's Native American/Other Population

27 residents of Mason County, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Mason County is comparable to the share in Illinois overall, where 0.5% of the population is Native American/Other. Mason County ranks 90th statewide in terms of Native American/Other residents as a share of the population, out of 102 counties.

Since the 2020 Census, Mason County's Native American/Other population has declined by an estimated 25.0%. Native American/Other residents' share of Mason County's population has remained roughly unchanged at 0.2%.

Mason County is more Native American/Other than neighboring Menard County (0% Native American/Other). Mason County is less Native American/Other than neighboring Fulton County (0.5% Native American/Other), Cass County (1% Native American/Other), Tazewell County (0.3% Native American/Other), and Sangamon County (0.6% Native American/Other).

Mason County's Multiracial Population

395 residents of Mason County, or 3.1% of the population, identify as Multiracial. The share of Multiracial residents in Mason County is comparable to the share in Illinois overall, where 3.4% of the population is Multiracial. Mason County ranks 46th statewide in terms of Multiracial residents as a share of the population, out of 102 counties.

Since the 2020 Census, Mason County's Multiracial population has declined by an estimated 12.6%. Multiracial residents' share of Mason County's population has remained roughly unchanged at 3.1%.

Mason County is more Multiracial than neighboring Menard County (2.8% Multiracial), Fulton County (2.1% Multiracial), Cass County (1.3% Multiracial), and Tazewell County (2.5% Multiracial). Mason County is less Multiracial than neighboring Sangamon County (4.3% 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.