Last official estimated population of Washington County was 20,276 (year 2014)[1]. This was 0.006% of total US population and 1.1% of total Nebraska state population. Area of Washington County is 393.2 mi² (=1018.4 km²), in this year population density was 51.57 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Washington County population in 2026 would be 20,403 [0].
Historical population of Washington County for period 1860-2014 [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
[1860-1870] +13.55 %/yr
[1870-1880] +6.84 %/yr
[1880-1890] +3.24 %/yr
[1890-1900] +0.98 %/yr
[1900-1910] -0.27 %/yr
[1910-1920] -0.45 %/yr
[1920-1930] -0.07 %/yr
[1930-1940] -0.44 %/yr
[1940-1950] -0.06 %/yr
[1950-1960] +0.5 %/yr
[1960-1970] +0.96 %/yr
[1970-1980] +1.54 %/yr
[1980-1990] +0.69 %/yr
[1990-2000] +1.24 %/yr
[2000-2005] +1.12 %/yr
[2005-2010] +0.37 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, NE
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 567 | 529 | 1,096 |
| 5 to 9 | 641 | 632 | 1,273 |
| 10 to 14 | 812 | 741 | 1,553 |
| 15 to 19 | 808 | 723 | 1,531 |
| 20 to 24 | 629 | 594 | 1,223 |
| 25 to 29 | 459 | 408 | 867 |
| 30 to 34 | 560 | 568 | 1,128 |
| 35 to 39 | 579 | 538 | 1,117 |
| 40 to 44 | 605 | 604 | 1,209 |
| 45 to 49 | 667 | 719 | 1,386 |
| 50 to 54 | 869 | 857 | 1,726 |
| 55 to 59 | 782 | 756 | 1,538 |
| 60 to 64 | 651 | 715 | 1,366 |
| 65 to 69 | 592 | 543 | 1,135 |
| 70 to 74 | 339 | 376 | 715 |
| 75 to 79 | 256 | 290 | 546 |
| 80 to 84 | 167 | 222 | 389 |
| 85+ | 147 | 313 | 460 |
Washington 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 | 9950 | 9997 | 19,947 |
| NH | 9856 | 9887 | 19,743 |
| WA | 9844 | 9884 | 19,728 |
| NHWAC | 9697 | 9770 | 19,467 |
| NHWA | 9607 | 9671 | 19,278 |
| H | 274 | 241 | 515 |
| HWAC | 253 | 227 | 480 |
| HWA | 237 | 213 | 450 |
| BAC | 148 | 106 | 254 |
| TOM | 111 | 123 | 234 |
| NHBAC | 132 | 94 | 226 |
| NHTOM | 93 | 108 | 201 |
| BA | 103 | 56 | 159 |
| IAC | 86 | 70 | 156 |
| NHBA | 95 | 49 | 144 |
| AAC | 57 | 72 | 129 |
| NHIAC | 67 | 59 | 126 |
| NHAAC | 53 | 70 | 123 |
| AA | 31 | 37 | 68 |
| NHAA | 30 | 37 | 67 |
| IA | 36 | 19 | 55 |
| NHIA | 28 | 17 | 45 |
| HTOM | 18 | 15 | 33 |
| HIAC | 19 | 11 | 30 |
| NAC | 10 | 19 | 29 |
| HBAC | 16 | 12 | 28 |
| NHNAC | 8 | 15 | 23 |
| HBA | 8 | 7 | 15 |
| NA | 5 | 9 | 14 |
| HIA | 8 | 2 | 10 |
| NHNA | 3 | 5 | 8 |
| HAAC | 4 | 2 | 6 |
| HNAC | 2 | 4 | 6 |
| HNA | 2 | 4 | 6 |
| HAA | 1 | 0 | 1 |
• Douglas County population
16.8 mi, 
167°
• Sarpy County
29.6 mi, 168°
• Pottawattamie County
37.7 mi, 
110°
• Dodge County
22 mi, 
277°
• Cass County
43.3 mi, 174°
• Saunders County
30.4 mi, 
225°
• Harrison County
23.1 mi, 
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• Monona County
38.2 mi, 
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• Cuming County
39.3 mi, 
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• Burt County
22.9 mi, 
345°
[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
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