Last official estimated population of Seneca County was 56,631 (year 2014)[1]. This was 0.018% of total US population and 0.5% of total Ohio state population. Area of Seneca County is 552.8 mi² (=1431.7 km²), in this year population density was 102.45 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Seneca County population in 2025 would be 56,319 [0].
Historical population of Seneca 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] +13.39 %/yr
[1840-1850] +4.1 %/yr
[1850-1860] +1.31 %/yr
[1860-1870] -0.01 %/yr
[1870-1880] +1.83 %/yr
[1880-1890] +1.01 %/yr
[1890-1900] +0.07 %/yr
[1900-1910] +0.3 %/yr
[1910-1920] +0.18 %/yr
[1920-1930] +1.05 %/yr
[1930-1940] +0.12 %/yr
[1940-1950] +0.89 %/yr
[1950-1960] +1.14 %/yr
[1960-1970] +0.23 %/yr
[1970-1980] +0.2 %/yr
[1980-1990] -0.36 %/yr
[1990-2000] -0.18 %/yr
[2000-2005] -0.34 %/yr
[2005-2010] -0.32 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Seneca County? Visit this page: Settlements in Seneca County, OH
Population of Seneca County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1462 | 1375 | 2,837 |
| 5 to 9 | 1864 | 1700 | 3,564 |
| 10 to 14 | 1952 | 1842 | 3,794 |
| 15 to 19 | 2178 | 2012 | 4,190 |
| 20 to 24 | 2145 | 1958 | 4,103 |
| 25 to 29 | 1661 | 1530 | 3,191 |
| 30 to 34 | 1666 | 1497 | 3,163 |
| 35 to 39 | 1608 | 1600 | 3,208 |
| 40 to 44 | 1642 | 1542 | 3,184 |
| 45 to 49 | 1691 | 1658 | 3,349 |
| 50 to 54 | 2038 | 2005 | 4,043 |
| 55 to 59 | 2133 | 2061 | 4,194 |
| 60 to 64 | 1880 | 1890 | 3,770 |
| 65 to 69 | 1389 | 1475 | 2,864 |
| 70 to 74 | 951 | 1090 | 2,041 |
| 75 to 79 | 680 | 862 | 1,542 |
| 80 to 84 | 477 | 765 | 1,242 |
| 85+ | 410 | 980 | 1,390 |
Seneca 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 | 26710 | 26908 | 53,618 |
| NH | 26404 | 26569 | 52,973 |
| WA | 26222 | 26447 | 52,669 |
| NHWAC | 25402 | 25751 | 51,153 |
| NHWA | 24984 | 25358 | 50,342 |
| H | 1423 | 1273 | 2,696 |
| HWAC | 1308 | 1157 | 2,465 |
| HWA | 1238 | 1089 | 2,327 |
| BAC | 1176 | 967 | 2,143 |
| NHBAC | 1038 | 841 | 1,879 |
| BA | 820 | 627 | 1,447 |
| NHBA | 739 | 548 | 1,287 |
| TOM | 507 | 482 | 989 |
| NHTOM | 431 | 412 | 843 |
| AAC | 248 | 259 | 507 |
| NHAAC | 234 | 248 | 482 |
| AA | 196 | 205 | 401 |
| NHAA | 190 | 202 | 392 |
| IAC | 200 | 188 | 388 |
| NHIAC | 159 | 143 | 302 |
| HBAC | 138 | 126 | 264 |
| HBA | 81 | 79 | 160 |
| HTOM | 76 | 70 | 146 |
| IA | 75 | 70 | 145 |
| NHIA | 56 | 46 | 102 |
| HIAC | 41 | 45 | 86 |
| HIA | 19 | 24 | 43 |
| NAC | 18 | 23 | 41 |
| NHNAC | 13 | 14 | 27 |
| HAAC | 14 | 11 | 25 |
| NA | 7 | 11 | 18 |
| HNAC | 5 | 9 | 14 |
| HNA | 3 | 8 | 11 |
| HAA | 6 | 3 | 9 |
| NHNA | 4 | 3 | 7 |
• Wood County population
30.6 mi, 
302°
• Richland County
38.8 mi, 
128°
• Hancock County
29.2 mi, 
253°
• Marion County
36.8 mi, 
183°
• Sandusky County
16.3 mi, 
357°
• Huron County
27.8 mi, 
86°
• Crawford County
21.5 mi, 
150°
• Ottawa County
30 mi, 
11°
• Hardin County
42.4 mi, 
221°
• Wyandot County
21.7 mi, 
206°
[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
*Sandusky Ohio Notes
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