People QuickFacts Rock County Wisconsin Population, 2012 estimate 160,418 5,726,398 Population, 2010 (April 1) estimates base 160,331 5,686,986 Population, percent change, April 1, 2010 to July 1, 2012 0.1% 0.7% Population, 2010 160,331 5,686,986 Persons under 5 years, percent, 2011 6.4% 6.2% Persons under 18 years, percent, 2011 24.5% 23.2% Persons 65 years and over, percent, 2011 13.8% 13.9% Female persons, percent, 2011 50.9% 50.3%  White persons, percent, 2011 (a) 91.2% 88.4% Black persons, percent, 2011 (a) 5.1% 6.5% American Indian and Alaska Native persons, percent, 2011 (a) 0.5% 1.1% Asian persons, percent, 2011 (a) 1.1% 2.4% Native Hawaiian and Other Pacific Islander persons, percent, 2011 (a) 0.1% Z Persons reporting two or more races, percent, 2011 2.0% 1.6% Persons of Hispanic or Latino Origin, percent, 2011 (b) 7.8% 6.1% White persons not Hispanic, percent, 2011 84.3% 83.1%  Living in same house 1 year & over, percent, 2007-2011 86.1% 85.5% Foreign born persons, percent, 2007-2011 4.5% 4.6% Language other than English spoken at home, percent age 5+, 2007-2011 8.2% 8.5% High school graduate or higher, percent of persons age 25+, 2007-2011 87.3% 89.8% Bachelor's degree or higher, percent of persons age 25+, 2007-2011 19.5% 26.0% Veterans, 2007-2011 13,039 431,479 Mean travel time to work (minutes), workers age 16+, 2007-2011 22.3 21.5  Housing units, 2011 68,474 2,634,781 Homeownership rate, 2007-2011 72.8% 69.1% Housing units in multi-unit structures, percent, 2007-2011 18.2% 25.4% Median value of owner-occupied housing units, 2007-2011 $139,000 $169,700 Households, 2007-2011 62,745 2,279,738 Persons per household, 2007-2011 2.50 2.42 Per capita money income in the past 12 months (2011 dollars), 2007-2011 $24,119 $27,192 Median household income, 2007-2011 $50,532 $52,374 Persons below poverty level, percent, 2007-2011 13.3% 12.0%     Business QuickFacts Rock County Wisconsin Private nonfarm establishments, 2010 3,292 139,554 Private nonfarm employment, 2010 51,167 2,320,696 Private nonfarm employment, percent change, 2000-2010 -15.8 -3.9 Nonemployer establishments, 2010 8,162 331,692  Total number of firms, 2007 11,212 433,797 Black-owned firms, percent, 2007 2.7% 2.6% American Indian- and Alaska Native-owned firms, percent, 2007 0.4% 0.6% Asian-owned firms, percent, 2007 1.6% 1.6% Native Hawaiian and Other Pacific Islander-owned firms, percent, 2007 F S Hispanic-owned firms, percent, 2007 1.9% 1.3% Women-owned firms, percent, 2007 27.9% 25.9%  Manufacturers shipments, 2007 ($1000) 12,381,604 163,563,195 Merchant wholesaler sales, 2007 ($1000) 2,700,128 59,996,244 Retail sales, 2007 ($1000) 2,439,767 72,283,321 Retail sales per capita, 2007 $15,301 $12,904 Accommodation and food services sales, 2007 ($1000) 211,671 9,247,311 Building permits, 2011 99 9,939     Geography QuickFacts Rock County Wisconsin Land area in square miles, 2010 718.14 54,157.80 Persons per square mile, 2010 223.3 105.0 FIPS Code 105 55 Metropolitan or Micropolitan Statistical Area Janesville, WI Metro Area   (a) Includes persons reporting only one race. (b) Hispanics may be of any race, so also are included in applicable race categories. FN: Footnote on this item for this area in place of data NA: Not available D: Suppressed to avoid disclosure of confidential information X: Not applicable S: Suppressed; does not meet publication standards Z: Value greater than zero but less than half unit of measure shown F: Fewer than 100 firms Source: US Census Bureau State & County QuickFacts