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The total population of Rock County is estimated to be 163,817 with 81,542 males (49.78%) and 82,275 females (50.22%). There are 733 more females than males in Rock County.
The median household income in Rock County was $70,819 in 2021, which marked an an increase of 3,376(5.01%) from $67,443 in 2020. This income is 94.92% 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 County sees its highest median household income among householders in the age group of 25 to 44 years old, at $80,218. Overall, the median household income for the county of Rock County stands at $66,451.
In Rock County, the median income for all workers aged 15 years and older, regardless of work hours, was $46,265 for males and $30,527 for females. However, when specifically considering full-time, year-round workers within the same age group, the median income was $59,400 for males and $48,567 for females.
In Rock County, the demographic landscape is diverse, spanning 5 distinct racial categories among households. Among these, White households have the highest median household income at $69,030, while Black or African American households represent the opposite end with the lowest median household income of $40,349.
In 2022, the population of Rock County was 164,060, a 0.08% decrease year-by-year from 2021. Previously, in 2021, Rock County's population was 164,192, an increase of 0.27% compared to a population of 163,751 in 2020.
The median age in Rock County, WI is 39.8, as per 2021 ACS 5-Year Estimates. Of the total population, 19.01% were under the age of 15, 18.75% aged 15 to 29, 45.69% aged 30 to 64, 14.66% aged 65 to 84, and 1.89% were 85 years of age and older.
Racial distribution of Rock County population: 84.47% are White, 4.78% are Black or African American, 0.26% are American Indian and Alaska Native, 1.19% are Asian, 0.02% are Native Hawaiian and other Pacific Islander, 4.14% are some other race and 5.14% are multiracial.