Last official estimated population of Ottawa County was 41,408 (year 2014)[1]. This was 0.013% of total US population and 0.4% of total Ohio state population. Area of Ottawa County is 585.1 mi² (=1515.3 km²), in this year population density was 70.78 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Ottawa County population in 2025 would be 41,353 [0].
Historical population of Ottawa 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] +3.94 %/yr
[1850-1860] +7.81 %/yr
[1860-1870] +6.66 %/yr
[1870-1880] +3.99 %/yr
[1880-1890] +1.07 %/yr
[1890-1900] +0.11 %/yr
[1900-1910] +0.07 %/yr
[1910-1920] -0.07 %/yr
[1920-1930] +0.83 %/yr
[1930-1940] +0.1 %/yr
[1940-1950] +1.92 %/yr
[1950-1960] +1.83 %/yr
[1960-1970] +0.49 %/yr
[1970-1980] +0.77 %/yr
[1980-1990] -0.01 %/yr
[1990-2000] +0.23 %/yr
[2000-2005] +0.32 %/yr
[2005-2010] -0.1 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Ottawa County? Visit this page: Settlements in Ottawa County, OH
Population of Ottawa County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 902 | 914 | 1,816 |
| 5 to 9 | 1104 | 1116 | 2,220 |
| 10 to 14 | 1258 | 1205 | 2,463 |
| 15 to 19 | 1234 | 1128 | 2,362 |
| 20 to 24 | 1019 | 995 | 2,014 |
| 25 to 29 | 944 | 894 | 1,838 |
| 30 to 34 | 984 | 962 | 1,946 |
| 35 to 39 | 1017 | 1011 | 2,028 |
| 40 to 44 | 1210 | 1169 | 2,379 |
| 45 to 49 | 1267 | 1314 | 2,581 |
| 50 to 54 | 1677 | 1669 | 3,346 |
| 55 to 59 | 1812 | 1826 | 3,638 |
| 60 to 64 | 1641 | 1783 | 3,424 |
| 65 to 69 | 1548 | 1482 | 3,030 |
| 70 to 74 | 1182 | 1156 | 2,338 |
| 75 to 79 | 732 | 820 | 1,552 |
| 80 to 84 | 465 | 583 | 1,048 |
| 85+ | 384 | 747 | 1,131 |
Ottawa 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 | 20028 | 20411 | 40,439 |
| WA | 19791 | 20167 | 39,958 |
| NH | 19317 | 19807 | 39,124 |
| NHWAC | 19013 | 19482 | 38,495 |
| NHWA | 18807 | 19260 | 38,067 |
| H | 1063 | 967 | 2,030 |
| HWAC | 1015 | 929 | 1,944 |
| HWA | 984 | 907 | 1,891 |
| BAC | 377 | 347 | 724 |
| NHBAC | 329 | 309 | 638 |
| TOM | 247 | 253 | 500 |
| NHTOM | 212 | 229 | 441 |
| BA | 230 | 199 | 429 |
| NHBA | 201 | 177 | 378 |
| IAC | 131 | 131 | 262 |
| AAC | 86 | 141 | 227 |
| NHAAC | 81 | 138 | 219 |
| NHIAC | 100 | 107 | 207 |
| AA | 62 | 103 | 165 |
| NHAA | 60 | 101 | 161 |
| IA | 45 | 48 | 93 |
| HBAC | 48 | 38 | 86 |
| NHIA | 32 | 36 | 68 |
| HTOM | 35 | 24 | 59 |
| HIAC | 31 | 24 | 55 |
| HBA | 29 | 22 | 51 |
| NAC | 16 | 14 | 30 |
| NHNAC | 13 | 12 | 25 |
| HIA | 13 | 12 | 25 |
| NHNA | 5 | 4 | 9 |
| NA | 5 | 4 | 9 |
| HAAC | 5 | 3 | 8 |
| HNAC | 3 | 2 | 5 |
| HAA | 2 | 2 | 4 |
| HNA | 0 | 0 | 0 |
• Lucas County population
25.4 mi, 
291°
• Lorain County
43.7 mi, 
99°
• Monroe County
35.4 mi, 
316°
• Wood County
34.1 mi, 
247°
• Erie County
25.2 mi, 
88°
• Hancock County
50.7 mi, 
222°
• Sandusky County
14.8 mi, 
207°
• Huron County
35.1 mi, 
141°
• Seneca County
30 mi, 
191°
• Crawford County
48.4 mi, 
174°
[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 17 Ohio Notes
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