Rock County Population 2018

Rock County's estimated population is 162,309 with a growth rate of 0.55% 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
2017162,3098880.55%
2016161,4213620.22%
2015161,059890.06%
2014160,9705970.37%
2013160,3732810.18%
2012160,0922100.13%
2011159,882-381-0.24%
2010160,26320,75314.88%
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
White146,49790.26%
Black or African American8,2315.07%
Two or More Races3,6652.26%
Asian1,9881.22%
American Indian and Alaska Native8500.52%
Native Hawaiian and Other Pacific Islander1030.06%

Rock County Population Pyramid

0k1k2k3k4k5k6k Male Population0k1k2k3k4k5k6k Female Population8580757065605550454035302520151050
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