Rock County Population 2017

Rock County's estimated population is 161,620 with a growth rate of 0.18% in the past year according to the most recent United States census data. Rock County is the 9th largest county in Wisconsin.

Year Population Growth Growth Rate
2016161,6202860.18%
2015161,3341530.09%
2014161,1816160.38%
2013160,5653330.21%
2012160,2322470.15%
2011159,985-244-0.15%
2010160,22920,71914.85%
1990139,510900.06%
1980139,4207,4505.65%
1970131,97018,05715.85%
1960113,91321,13522.78%
195092,77812,60515.72%
194080,1735,9678.04%
193074,2068,05612.18%
192066,15010,61219.11%
191055,5384,3358.47%
190051,2037,98318.47%
189043,2204,39711.33%
188038,823-207-0.53%
187039,0302,3406.38%
186036,69015,94076.82%
185020,75019,0491119.87%
18401,7010.00%

Rock County Population Growth

Population Data via

Rock County Race Data

Race Population Percentage
White146,49790.64%
Black or African American8,2315.09%
Two or More Races3,6652.27%
Asian1,9881.23%
American Indian and Alaska Native8500.53%
Native Hawaiian and Other Pacific Islander1030.06%

Rock County Population Pyramid

0k1k2k3k4k5k6kRock County Male Population0k1k2k3k4k5k6kRock County Female Population

Population of Cities in Rock County

City 2010 Census 2016 Estimated Growth Growth Rate
Janesville63621641595380.85%
Beloit3700536757-248-0.67%
Milton55555580250.45%
Edgerton541855521342.47%
Evansville503152652344.65%
Clinton21532126-27-1.25%
Orfordville14421490483.33%
Footville808803-5-0.62%
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990