Last official estimated population of Waukesha County was 390,079 (year 2014)[1]. This was 0.122% of total US population and 6.8% of total Wisconsin state population. Area of Waukesha County is 580.5 mi² (=1503.6 km²), in this year population density was 671.93 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Waukesha County population in 2026 would be 390,644 [0].
Historical population of Waukesha County for period 1850-2014 [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

[1850-1860] +3.37 %/yr
[1860-1870] +0.53 %/yr
[1870-1880] +0.24 %/yr
[1880-1890] +1.4 %/yr
[1890-1900] +0.57 %/yr
[1900-1910] +0.52 %/yr
[1910-1920] +1.39 %/yr
[1920-1930] +2.08 %/yr
[1930-1940] +1.83 %/yr
[1940-1950] +3.19 %/yr
[1950-1960] +6.3 %/yr
[1960-1970] +3.87 %/yr
[1970-1980] +1.94 %/yr
[1980-1990] +0.84 %/yr
[1990-2000] +1.7 %/yr
[2000-2005] +0.98 %/yr
[2005-2010] +0.57 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Waukesha County? Visit this page: Settlements in Waukesha County, WI
Population of Waukesha County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 10284 | 9976 | 20,260 |
| 5 to 9 | 12060 | 11722 | 23,782 |
| 10 to 14 | 14003 | 13213 | 27,216 |
| 15 to 19 | 13527 | 13135 | 26,662 |
| 20 to 24 | 10648 | 10289 | 20,937 |
| 25 to 29 | 9692 | 9448 | 19,140 |
| 30 to 34 | 11321 | 11019 | 22,340 |
| 35 to 39 | 11386 | 11276 | 22,662 |
| 40 to 44 | 12447 | 12648 | 25,095 |
| 45 to 49 | 14113 | 14717 | 28,830 |
| 50 to 54 | 16467 | 17298 | 33,765 |
| 55 to 59 | 16221 | 16223 | 32,444 |
| 60 to 64 | 13192 | 13692 | 26,884 |
| 65 to 69 | 10268 | 10849 | 21,117 |
| 70 to 74 | 6797 | 7761 | 14,558 |
| 75 to 79 | 4750 | 6150 | 10,900 |
| 80 to 84 | 3692 | 5148 | 8,840 |
| 85+ | 3204 | 6482 | 9,686 |
Waukesha 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 |
| NH | 184823 | 192195 | 377,018 |
| WAC | 184131 | 190843 | 374,974 |
| WA | 181649 | 188313 | 369,962 |
| NHWAC | 175327 | 182439 | 357,766 |
| NHWA | 173111 | 180195 | 353,306 |
| H | 9249 | 8851 | 18,100 |
| HWAC | 8804 | 8404 | 17,208 |
| HWA | 8538 | 8118 | 16,656 |
| AAC | 7172 | 7752 | 14,924 |
| NHAAC | 7055 | 7633 | 14,688 |
| AA | 6151 | 6719 | 12,870 |
| NHAA | 6097 | 6667 | 12,764 |
| BAC | 4010 | 3712 | 7,722 |
| NHBAC | 3697 | 3405 | 7,102 |
| BA | 2990 | 2643 | 5,633 |
| NHBA | 2798 | 2464 | 5,262 |
| TOM | 2568 | 2629 | 5,197 |
| NHTOM | 2284 | 2328 | 4,612 |
| IAC | 1278 | 1324 | 2,602 |
| NHIAC | 1005 | 1007 | 2,012 |
| IA | 608 | 624 | 1,232 |
| NHIA | 465 | 448 | 913 |
| HBAC | 313 | 307 | 620 |
| HIAC | 273 | 317 | 590 |
| HTOM | 284 | 301 | 585 |
| NAC | 203 | 197 | 400 |
| HBA | 192 | 179 | 371 |
| HIA | 143 | 176 | 319 |
| NHNAC | 149 | 159 | 308 |
| HAAC | 117 | 119 | 236 |
| NA | 106 | 118 | 224 |
| NHNA | 68 | 93 | 161 |
| HAA | 54 | 52 | 106 |
| HNAC | 54 | 38 | 92 |
| HNA | 38 | 25 | 63 |
• Milwaukee County population
41.7 mi,
90°
• McHenry County
48.6 mi,
188°
• Racine County
48.7 mi,
112°
• Rock County
45.8 mi,
238°
• Washington County
26 mi,
8°
• Walworth County
27 mi,
206°
• Fond du Lac County
51.7 mi,
349°
• Dodge County
34.3 mi,
324°
• Ozaukee County
47.1 mi,
59°
• Jefferson County
23.6 mi,
269°
[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
*Milwaukee Wisconsin Notes
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