Rock Island County, IL Demographics

The total population of Rock Island County is estimated to be 143,819 with 71,318 males (49.59%) and 72,501 females (50.41%). There are 1,183 more females than males in Rock Island County.
The median household income in Rock Island County was $63,746 in 2021, which marked an an increase of 313(0.49%) from $63,433 in 2020. This income is 85.44% of the U.S. median household income of $74,606 (all incomes in 2022 inflation-adjusted dollars).
Per the latest American Community Survey by the Census Bureau, Rock Island County sees its highest median household income among householders in the age group of 45 to 64 years old, at $77,027. Overall, the median household income for the county of Rock Island County stands at $62,086.
In Rock Island County, the median income for all workers aged 15 years and older, regardless of work hours, was $43,090 for males and $30,568 for females. However, when specifically considering full-time, year-round workers within the same age group, the median income was $53,337 for males and $44,025 for females.
In Rock Island County, the demographic landscape is diverse, spanning 6 distinct racial categories among households. Among these, Asian households have the highest median household income at $120,181, while American Indian and Alaska Native households represent the opposite end with the lowest median household income of $31,332.
In 2022, the population of Rock Island County was 141,527, a 1.02% decrease year-by-year from 2021. Previously, in 2021, Rock Island County's population was 142,992, a decline of 0.95% compared to a population of 144,359 in 2020.
The median age in Rock Island County, IL is 40.1, as per 2021 ACS 5-Year Estimates. Of the total population, 18.72% were under the age of 15, 18.59% aged 15 to 29, 43.40% aged 30 to 64, 16.84% aged 65 to 84, and 2.45% were 85 years of age and older.
Racial distribution of Rock Island County population: 77.09% are White, 10.96% are Black or African American, 0.28% are American Indian and Alaska Native, 2.57% are Asian, 0.15% are Native Hawaiian and other Pacific Islander, 3.37% are some other race and 5.57% are multiracial.