Last official estimated population of Rock County was 160,230 (year 2014)[1]. This was 0.05% of total US population and 2.8% of total Wisconsin state population. Area of Rock County is 726.1 mi² (=1880.6 km²), in this year population density was 220.67 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Rock County population in 2024 would be 159,978 [0].
Historical population of Rock County for period 1840-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1840-1850] +28.42 %/yr
[1850-1860] +5.87 %/yr
[1860-1870] +0.62 %/yr
[1870-1880] -0.05 %/yr
[1880-1890] +1.08 %/yr
[1890-1900] +1.71 %/yr
[1900-1910] +0.82 %/yr
[1910-1920] +1.76 %/yr
[1920-1930] +1.16 %/yr
[1930-1940] +0.78 %/yr
[1940-1950] +1.47 %/yr
[1950-1960] +2.07 %/yr
[1960-1970] +1.48 %/yr
[1970-1980] +0.55 %/yr
[1980-1990] +0.01 %/yr
[1990-2000] +0.88 %/yr
[2000-2005] +0.58 %/yr
[2005-2010] +0.45 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Rock County? Visit this page: Settlements in Rock County, WI
Population of Rock County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4990 | 4733 | 9,723 |
| 5 to 9 | 5533 | 5241 | 10,774 |
| 10 to 14 | 5750 | 5519 | 11,269 |
| 15 to 19 | 5496 | 5221 | 10,717 |
| 20 to 24 | 5039 | 5056 | 10,095 |
| 25 to 29 | 4640 | 4690 | 9,330 |
| 30 to 34 | 5175 | 5366 | 10,541 |
| 35 to 39 | 4930 | 4816 | 9,746 |
| 40 to 44 | 5168 | 5256 | 10,424 |
| 45 to 49 | 5306 | 5478 | 10,784 |
| 50 to 54 | 5984 | 6066 | 12,050 |
| 55 to 59 | 5687 | 5917 | 11,604 |
| 60 to 64 | 4803 | 5005 | 9,808 |
| 65 to 69 | 3647 | 4066 | 7,713 |
| 70 to 74 | 2613 | 3106 | 5,719 |
| 75 to 79 | 2014 | 2352 | 4,366 |
| 80 to 84 | 1326 | 1892 | 3,218 |
| 85+ | 1093 | 2214 | 3,307 |
Rock County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 73578 | 76316 | 149,894 |
| NH | 72245 | 75657 | 147,902 |
| WA | 71863 | 74606 | 146,469 |
| NHWAC | 67200 | 70447 | 137,647 |
| NHWA | 65739 | 68973 | 134,712 |
| H | 6949 | 6337 | 13,286 |
| HWAC | 6378 | 5869 | 12,247 |
| HWA | 6124 | 5633 | 11,757 |
| BAC | 5273 | 5147 | 10,420 |
| NHBAC | 4871 | 4800 | 9,671 |
| BA | 4179 | 4099 | 8,278 |
| NHBA | 3924 | 3876 | 7,800 |
| TOM | 1783 | 1769 | 3,552 |
| NHTOM | 1511 | 1523 | 3,034 |
| AAC | 1185 | 1452 | 2,637 |
| NHAAC | 1118 | 1392 | 2,510 |
| AA | 857 | 1110 | 1,967 |
| NHAA | 818 | 1081 | 1,899 |
| IAC | 934 | 852 | 1,786 |
| NHIAC | 573 | 551 | 1,124 |
| IA | 464 | 363 | 827 |
| HBAC | 402 | 347 | 749 |
| HIAC | 361 | 301 | 662 |
| HTOM | 272 | 246 | 518 |
| HBA | 255 | 223 | 478 |
| HIA | 235 | 185 | 420 |
| NHIA | 229 | 178 | 407 |
| NAC | 107 | 106 | 213 |
| NHNAC | 71 | 77 | 148 |
| HAAC | 67 | 60 | 127 |
| NA | 48 | 47 | 95 |
| HAA | 39 | 29 | 68 |
| HNAC | 36 | 29 | 65 |
| NHNA | 24 | 26 | 50 |
| HNA | 24 | 21 | 45 |
• Dane County population
32.5 mi, 
327°
• Waukesha County
45.8 mi, 
58°
• McHenry County
39.7 mi, 
126°
• Winnebago County
23.4 mi, 
190°
• Walworth County
27.1 mi, 
90°
• Jefferson County
28.2 mi, 
32°
• Boone County
27.4 mi, 
152°
• Ogle County
45.2 mi, 
196°
• Stephenson County
37.3 mi, 
233°
• Green County
26.9 mi, 
270°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Brown Wisconsin Notes
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