Last official estimated population of Gallia County was 31,057 (year 2014)[1]. This was 0.01% of total US population and 0.3% of total Ohio state population. Area of Gallia County is 471.2 mi² (=1220.4 km²), in this year population density was 65.91 p/mi². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Gallia County population in 2025 would be 31,398 [0].
Historical population of Gallia County for period 1810-2014 [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
[1810-1820] +5.44 %/yr
[1820-1830] +3.21 %/yr
[1830-1840] +3.28 %/yr
[1840-1850] +2.41 %/yr
[1850-1860] +2.59 %/yr
[1860-1870] +1.49 %/yr
[1870-1880] +0.97 %/yr
[1880-1890] -0.41 %/yr
[1890-1900] +0.33 %/yr
[1900-1910] -0.81 %/yr
[1910-1920] -0.99 %/yr
[1920-1930] -0.11 %/yr
[1930-1940] +0.79 %/yr
[1940-1950] -0.01 %/yr
[1950-1960] +0.48 %/yr
[1960-1970] -0.34 %/yr
[1970-1980] +1.78 %/yr
[1980-1990] +0.28 %/yr
[1990-2000] +0.03 %/yr
[2000-2005] -0.04 %/yr
[2005-2010] -0.04 %/yr
[2010-2014] +0.1 %/yr
Looking for settlements in Gallia County? Visit this page: Settlements in Gallia County, OH
Population of Gallia County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 962 | 895 | 1,857 |
| 5 to 9 | 998 | 905 | 1,903 |
| 10 to 14 | 997 | 977 | 1,974 |
| 15 to 19 | 1046 | 930 | 1,976 |
| 20 to 24 | 931 | 937 | 1,868 |
| 25 to 29 | 891 | 873 | 1,764 |
| 30 to 34 | 915 | 865 | 1,780 |
| 35 to 39 | 822 | 851 | 1,673 |
| 40 to 44 | 942 | 939 | 1,881 |
| 45 to 49 | 911 | 928 | 1,839 |
| 50 to 54 | 1106 | 1176 | 2,282 |
| 55 to 59 | 1151 | 1175 | 2,326 |
| 60 to 64 | 962 | 1019 | 1,981 |
| 65 to 69 | 779 | 840 | 1,619 |
| 70 to 74 | 622 | 778 | 1,400 |
| 75 to 79 | 479 | 532 | 1,011 |
| 80 to 84 | 265 | 391 | 656 |
| 85+ | 196 | 411 | 607 |
Gallia 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 | 14794 | 15249 | 30,043 |
| WAC | 14335 | 14954 | 29,289 |
| NHWAC | 14179 | 14798 | 28,977 |
| WA | 14075 | 14736 | 28,811 |
| NHWA | 13947 | 14594 | 28,541 |
| BAC | 601 | 464 | 1,065 |
| NHBAC | 574 | 448 | 1,022 |
| BA | 452 | 339 | 791 |
| NHBA | 439 | 331 | 770 |
| TOM | 278 | 227 | 505 |
| NHTOM | 250 | 213 | 463 |
| H | 181 | 173 | 354 |
| IAC | 186 | 141 | 327 |
| HWAC | 156 | 156 | 312 |
| NHIAC | 167 | 127 | 294 |
| HWA | 128 | 142 | 270 |
| AAC | 131 | 92 | 223 |
| NHAAC | 122 | 91 | 213 |
| AA | 94 | 69 | 163 |
| NHAA | 90 | 68 | 158 |
| IA | 76 | 49 | 125 |
| NHIA | 68 | 43 | 111 |
| HBAC | 27 | 16 | 43 |
| HTOM | 28 | 14 | 42 |
| HIAC | 19 | 14 | 33 |
| HBA | 13 | 8 | 21 |
| NAC | 10 | 9 | 19 |
| NHNAC | 10 | 7 | 17 |
| HIA | 8 | 6 | 14 |
| HAAC | 9 | 1 | 10 |
| HAA | 4 | 1 | 5 |
| HNAC | 0 | 2 | 2 |
| HNA | 0 | 2 | 2 |
| NA | 0 | 2 | 2 |
| NHNA | 0 | 0 | 0 |
• Cabell County population
27.6 mi, 
173°
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37.5 mi, 
269°
• Lawrence County
18.8 mi, 
218°
• Putnam County
30.1 mi, 
134°
• Boyd County
37.6 mi, 
212°
• Jackson County
21.6 mi, 
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• Jackson County
33.6 mi, 
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• Mason County
15.5 mi, 
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• Meigs County
23.9 mi, 
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• Vinton County
31.6 mi, 
341°
[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
*Washington Ohio Notes
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