Last official estimated population of Defiance County was 39,106 (year 2014)[1]. This was 0.012% of total US population and 0.3% of total Ohio state population. Area of Defiance County is 414.2 mi² (=1072.7 km²), in this year population density was 94.42 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Defiance County population in 2026 would be 39,314 [0].
Historical population of Defiance 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] +5.49 %/yr
[1860-1870] +2.83 %/yr
[1870-1880] +3.66 %/yr
[1880-1890] +1.36 %/yr
[1890-1900] +0.24 %/yr
[1900-1910] -0.74 %/yr
[1910-1920] +0.02 %/yr
[1920-1930] -0.77 %/yr
[1930-1940] +0.7 %/yr
[1940-1950] +0.62 %/yr
[1950-1960] +1.97 %/yr
[1960-1970] +1.61 %/yr
[1970-1980] +0.79 %/yr
[1980-1990] -0.16 %/yr
[1990-2000] +0.04 %/yr
[2000-2005] -0.23 %/yr
[2005-2010] -0.01 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Defiance County? Visit this page: Settlements in Defiance County, OH
Population of Defiance County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1113 | 1105 | 2,218 |
| 5 to 9 | 1288 | 1181 | 2,469 |
| 10 to 14 | 1368 | 1337 | 2,705 |
| 15 to 19 | 1407 | 1291 | 2,698 |
| 20 to 24 | 1284 | 1155 | 2,439 |
| 25 to 29 | 1117 | 1061 | 2,178 |
| 30 to 34 | 1134 | 1157 | 2,291 |
| 35 to 39 | 1070 | 1118 | 2,188 |
| 40 to 44 | 1169 | 1201 | 2,370 |
| 45 to 49 | 1152 | 1119 | 2,271 |
| 50 to 54 | 1311 | 1390 | 2,701 |
| 55 to 59 | 1470 | 1476 | 2,946 |
| 60 to 64 | 1265 | 1286 | 2,551 |
| 65 to 69 | 1036 | 1017 | 2,053 |
| 70 to 74 | 714 | 843 | 1,557 |
| 75 to 79 | 534 | 672 | 1,206 |
| 80 to 84 | 339 | 458 | 797 |
| 85+ | 253 | 619 | 872 |
Defiance 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 | 18371 | 18912 | 37,283 |
| WA | 18121 | 18653 | 36,774 |
| NH | 17099 | 17697 | 34,796 |
| NHWAC | 16552 | 17246 | 33,798 |
| NHWA | 16359 | 17038 | 33,397 |
| H | 1925 | 1789 | 3,714 |
| HWAC | 1819 | 1666 | 3,485 |
| HWA | 1762 | 1615 | 3,377 |
| BAC | 627 | 541 | 1,168 |
| NHBAC | 533 | 437 | 970 |
| BA | 480 | 374 | 854 |
| NHBA | 412 | 300 | 712 |
| TOM | 266 | 284 | 550 |
| NHTOM | 207 | 227 | 434 |
| IAC | 172 | 186 | 358 |
| NHIAC | 114 | 126 | 240 |
| AAC | 113 | 125 | 238 |
| NHAAC | 102 | 112 | 214 |
| HBAC | 94 | 104 | 198 |
| AA | 78 | 88 | 166 |
| NHAA | 74 | 83 | 157 |
| IA | 72 | 83 | 155 |
| HBA | 68 | 74 | 142 |
| HIAC | 58 | 60 | 118 |
| HTOM | 59 | 57 | 116 |
| NHIA | 41 | 45 | 86 |
| HIA | 31 | 38 | 69 |
| NAC | 15 | 13 | 28 |
| HAAC | 11 | 13 | 24 |
| NHNAC | 13 | 9 | 22 |
| NA | 7 | 4 | 11 |
| NHNA | 6 | 4 | 10 |
| HAA | 4 | 5 | 9 |
| HNAC | 2 | 4 | 6 |
| HNA | 1 | 0 | 1 |
• Allen County population
34.3 mi,
242°
• Hillsdale County
38.4 mi,
347°
• Fulton County
26.7 mi,
44°
• DeKalb County
27.2 mi,
281°
• Williams County
17.6 mi,
343°
• Putnam County
27.7 mi,
137°
• Steuben County
34.7 mi,
309°
• Van Wert County
32.6 mi,
189°
• Henry County
21.7 mi,
88°
• Paulding County
14.9 mi,
199°
[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
See note 6 Ohio Notes
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