Last official estimated population of Jefferson County was 83,686 (year 2014)[1]. This was 0.026% of total US population and 1.5% of total Wisconsin state population. Area of Jefferson County is 582.8 mi² (=1509.3 km²), in this year population density was 143.60 p/mi². If population growth rate would be same as in period 2010-2014 (0%/yr), Jefferson County population in 2024 would be 83,686 [0].
Historical population of Jefferson 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] +32.56 %/yr
[1850-1860] +7.11 %/yr
[1860-1870] +1.12 %/yr
[1870-1880] -0.57 %/yr
[1880-1890] +0.42 %/yr
[1890-1900] +0.37 %/yr
[1900-1910] -0.14 %/yr
[1910-1920] +0.21 %/yr
[1920-1930] +0.49 %/yr
[1930-1940] +0.55 %/yr
[1940-1950] +1.03 %/yr
[1950-1960] +1.52 %/yr
[1960-1970] +1.83 %/yr
[1970-1980] +0.97 %/yr
[1980-1990] +0.24 %/yr
[1990-2000] +1.13 %/yr
[2000-2005] +1.17 %/yr
[2005-2010] +0.81 %/yr
[2010-2014] 0 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, WI
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2414 | 2206 | 4,620 |
| 5 to 9 | 2689 | 2551 | 5,240 |
| 10 to 14 | 2796 | 2709 | 5,505 |
| 15 to 19 | 3302 | 3187 | 6,489 |
| 20 to 24 | 2682 | 2524 | 5,206 |
| 25 to 29 | 2328 | 2362 | 4,690 |
| 30 to 34 | 2624 | 2682 | 5,306 |
| 35 to 39 | 2617 | 2486 | 5,103 |
| 40 to 44 | 2846 | 2702 | 5,548 |
| 45 to 49 | 3011 | 2896 | 5,907 |
| 50 to 54 | 3271 | 3311 | 6,582 |
| 55 to 59 | 3124 | 3075 | 6,199 |
| 60 to 64 | 2636 | 2712 | 5,348 |
| 65 to 69 | 2095 | 2158 | 4,253 |
| 70 to 74 | 1442 | 1653 | 3,095 |
| 75 to 79 | 1029 | 1207 | 2,236 |
| 80 to 84 | 634 | 838 | 1,472 |
| 85+ | 580 | 1016 | 1,596 |
Jefferson 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 | 41135 | 41277 | 82,412 |
| WA | 40661 | 40805 | 81,466 |
| NH | 39077 | 39483 | 78,560 |
| NHWAC | 38248 | 38610 | 76,858 |
| NHWA | 37841 | 38215 | 76,056 |
| H | 3043 | 2792 | 5,835 |
| HWAC | 2887 | 2667 | 5,554 |
| HWA | 2820 | 2590 | 5,410 |
| BAC | 619 | 581 | 1,200 |
| NHBAC | 545 | 503 | 1,048 |
| TOM | 493 | 499 | 992 |
| AAC | 450 | 532 | 982 |
| NHAAC | 430 | 512 | 942 |
| NHTOM | 424 | 419 | 843 |
| BA | 432 | 375 | 807 |
| IAC | 394 | 368 | 762 |
| AA | 318 | 407 | 725 |
| NHAA | 310 | 396 | 706 |
| NHBA | 376 | 326 | 702 |
| NHIAC | 270 | 264 | 534 |
| IA | 206 | 176 | 382 |
| NHIA | 122 | 116 | 238 |
| HIAC | 124 | 104 | 228 |
| HBAC | 74 | 78 | 152 |
| HTOM | 69 | 80 | 149 |
| HIA | 84 | 60 | 144 |
| HBA | 56 | 49 | 105 |
| NAC | 28 | 30 | 58 |
| NHNAC | 18 | 25 | 43 |
| HAAC | 20 | 20 | 40 |
| NA | 10 | 13 | 23 |
| HAA | 8 | 11 | 19 |
| HNAC | 10 | 5 | 15 |
| NHNA | 4 | 11 | 15 |
| HNA | 6 | 2 | 8 |
• Dane County population
32.7 mi, 
276°
• Waukesha County
23.6 mi, 
89°
• McHenry County
50.4 mi, 
161°
• Rock County
28.2 mi, 
212°
• Washington County
37.7 mi, 
46°
• Walworth County
26.6 mi, 
153°
• Dodge County
28.5 mi, 
7°
• Columbia County
42.3 mi, 
318°
• Boone County
48.1 mi, 
183°
• Green County
48.2 mi, 
240°
[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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