Last official estimated population of Washtenaw County was 345,525 (year 2014)[1]. This was 0.108% of total US population and 3.5% of total Michigan state population. Area of Washtenaw County is 722.4 mi² (=1871.1 km²), in this year population density was 478.29 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Washtenaw County population in 2026 would be 347,736 [0].
Historical population of Washtenaw County for period 1830-2014 [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
[1830-1840] +19.28 %/yr
[1840-1850] +1.94 %/yr
[1850-1860] +2.25 %/yr
[1860-1870] +1.5 %/yr
[1870-1880] +0.1 %/yr
[1880-1890] +0.09 %/yr
[1890-1900] +1.24 %/yr
[1900-1910] -0.66 %/yr
[1910-1920] +1.03 %/yr
[1920-1930] +2.84 %/yr
[1930-1940] +2.12 %/yr
[1940-1950] +5.23 %/yr
[1950-1960] +2.51 %/yr
[1960-1970] +3.1 %/yr
[1970-1980] +1.24 %/yr
[1980-1990] +0.67 %/yr
[1990-2000] +1.33 %/yr
[2000-2005] +1.17 %/yr
[2005-2010] +0.15 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Washtenaw County? Visit this page: Settlements in Washtenaw County, MI
Population of Washtenaw County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 9432 | 9321 | 18,753 |
| 5 to 9 | 9850 | 9461 | 19,311 |
| 10 to 14 | 10266 | 9719 | 19,985 |
| 15 to 19 | 15328 | 15051 | 30,379 |
| 20 to 24 | 23762 | 22890 | 46,652 |
| 25 to 29 | 13652 | 12934 | 26,586 |
| 30 to 34 | 11979 | 11789 | 23,768 |
| 35 to 39 | 10364 | 10119 | 20,483 |
| 40 to 44 | 10483 | 10753 | 21,236 |
| 45 to 49 | 10712 | 11228 | 21,940 |
| 50 to 54 | 11295 | 11798 | 23,093 |
| 55 to 59 | 10529 | 11563 | 22,092 |
| 60 to 64 | 9299 | 10419 | 19,718 |
| 65 to 69 | 7353 | 8064 | 15,417 |
| 70 to 74 | 4795 | 5619 | 10,414 |
| 75 to 79 | 2982 | 3635 | 6,617 |
| 80 to 84 | 2016 | 2810 | 4,826 |
| 85+ | 1954 | 3650 | 5,604 |
Washtenaw 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 | 168248 | 172783 | 341,031 |
| WAC | 137144 | 140180 | 277,324 |
| WA | 131764 | 134633 | 266,397 |
| NHWAC | 130214 | 133107 | 263,321 |
| NHWA | 125295 | 128151 | 253,446 |
| BAC | 25213 | 26687 | 51,900 |
| NHBAC | 24420 | 25817 | 50,237 |
| BA | 22296 | 23537 | 45,833 |
| NHBA | 21779 | 23024 | 44,803 |
| AAC | 17691 | 17975 | 35,666 |
| NHAAC | 17472 | 17701 | 35,173 |
| AA | 15421 | 15753 | 31,174 |
| NHAA | 15333 | 15613 | 30,946 |
| H | 7803 | 8040 | 15,843 |
| HWAC | 6930 | 7073 | 14,003 |
| HWA | 6469 | 6482 | 12,951 |
| TOM | 5800 | 6050 | 11,850 |
| NHTOM | 5297 | 5405 | 10,702 |
| IAC | 2120 | 2361 | 4,481 |
| NHIAC | 1701 | 1865 | 3,566 |
| HBAC | 793 | 870 | 1,663 |
| IA | 697 | 726 | 1,423 |
| HTOM | 503 | 645 | 1,148 |
| HBA | 517 | 513 | 1,030 |
| NHIA | 482 | 511 | 993 |
| HIAC | 419 | 496 | 915 |
| NAC | 244 | 313 | 557 |
| HAAC | 219 | 274 | 493 |
| NHNAC | 207 | 229 | 436 |
| HIA | 215 | 215 | 430 |
| HAA | 88 | 140 | 228 |
| NA | 73 | 124 | 197 |
| NHNA | 62 | 79 | 141 |
| HNAC | 37 | 84 | 121 |
| HNA | 11 | 45 | 56 |
• Wayne County population
29.9 mi, 
85°
• Oakland County
36.7 mi, 
39°
• Lucas County
43.9 mi, 
153°
• Ingham County
36.3 mi, 
311°
• Livingston County
24.4 mi, 
351°
• Jackson County
29.5 mi, 
269°
• Monroe County
29.6 mi, 
141°
• Lenawee County
27.3 mi, 
205°
• Hillsdale County
48.9 mi, 
236°
• Fulton County
47.5 mi, 
197°
[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
*Wayne, Macomb Michigan Notes
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