Jury Pool Profile
Rock County, Wisconsin
- County seat
- Janesville
- Judicial district
- Rock County Circuit Court (5th Judicial District)
- Population (July 2025 estimate)
- 166,472
- Census PEP. The five-year ACS survey average is 164,350.
At a glance
Rock County is a 166,472-person venue. The county population is 82% White (Census race-alone categories). 10% identify as Hispanic or Latino of any race. Median household income is $73,982, $3,575 below the WI state median of $77,557; 25.8% of residents 25 and over hold a bachelor's degree or higher. 8.8% of residents 5 and older speak a language other than English at home, most commonly Spanish and German or other West Germanic. The largest employment sector is Trade, transportation & utilities, at 24.4% of covered employment, average pay $55,112/year. Trailing-12-month unemployment is 3.62%, above the 3.3% state average. The county carried the Democratic presidential candidate in 2016, 2020, and 2024, taking 52% to 55% of the vote across the three.
- Population
- 164,350
- Median household income
- $75,673
- Unemployment
- 3.6%
Who sits on a jury?
≥70% White (race-alone) and <20% Black. This county: 82% / 5%.
Rock County has a population of 164,350, with a median age of 40.3. By Census race-alone categories, White residents make up 81.6%; Black residents 4.7%. Independently, 10.1% of residents identify as Hispanic or Latino of any race.
The median household earns $73,982; 25.8% of residents 25 and over hold a bachelor's degree or higher; 9.9% live below the federal poverty line.
Economic context
Largest sector in BLS QCEW: Trade, transportation & utilities, about 17,010 jobs; Education & health services, about 15,700, is within 20% of it, counting the jobs BLS withholds.
Trade, transportation & utilities is the largest employment sector at 24.4% of covered employment, followed by Education & health services at 22.2%. Trailing-12-month unemployment is 3.62%, above the Wisconsin state average.
Political composition
Democratic candidate carried this county in 2016, 2020, and 2024 (avg winning share: 53%). 'Strongly' threshold: ≥60% avg.
Rock County was carried by the Democratic candidate in the 2016, 2020, and 2024 cycles, with 52.9% in 2024, 54.7% in 2020, 52.4% in 2016.
Languages, households, faith & health
Family households are 63% of all households (thresholds: ≥70% = 'family-dominant'; 50–70% = 'family-majority'; <50% = 'singles/nonfamily-majority'). 8.8% of residents 5 and older speak a language other than English at home (threshold for 'linguistically diverse' is ≥10%).
8.8% of residents 5 years and older speak a language other than English at home. The most common are Spanish, German or other West Germanic, Vietnamese. Veterans account for 6.9% of the adult civilian population (8,848 individuals).