Last official estimated population of Guernsey County was 40,102 (year 2014)[1]. This was 0.013% of total US population and 0.3% of total Ohio state population. Area of Guernsey County is 528.3 mi² (=1368.3 km²), in this year population density was 75.91 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Guernsey County population in 2025 would be 40,143 [0].
Historical population of Guernsey 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] +11.78 %/yr
[1820-1830] +6.86 %/yr
[1830-1840] +4.4 %/yr
[1840-1850] +0.93 %/yr
[1850-1860] -2.16 %/yr
[1860-1870] -0.26 %/yr
[1870-1880] +1.33 %/yr
[1880-1890] +0.52 %/yr
[1890-1900] +1.86 %/yr
[1900-1910] +2.18 %/yr
[1910-1920] +0.6 %/yr
[1920-1930] -0.89 %/yr
[1930-1940] -0.66 %/yr
[1940-1950] -0.1 %/yr
[1950-1960] +0.03 %/yr
[1960-1970] -0.24 %/yr
[1970-1980] +1.1 %/yr
[1980-1990] -0.74 %/yr
[1990-2000] +0.45 %/yr
[2000-2005] -0.03 %/yr
[2005-2010] -0.33 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Guernsey County? Visit this page: Settlements in Guernsey County, OH
Population of Guernsey County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1182 | 1154 | 2,336 |
| 5 to 9 | 1269 | 1209 | 2,478 |
| 10 to 14 | 1308 | 1280 | 2,588 |
| 15 to 19 | 1325 | 1211 | 2,536 |
| 20 to 24 | 1127 | 1150 | 2,277 |
| 25 to 29 | 1170 | 1092 | 2,262 |
| 30 to 34 | 1122 | 1142 | 2,264 |
| 35 to 39 | 1091 | 1028 | 2,119 |
| 40 to 44 | 1198 | 1280 | 2,478 |
| 45 to 49 | 1328 | 1267 | 2,595 |
| 50 to 54 | 1464 | 1505 | 2,969 |
| 55 to 59 | 1470 | 1571 | 3,041 |
| 60 to 64 | 1330 | 1398 | 2,728 |
| 65 to 69 | 1115 | 1176 | 2,291 |
| 70 to 74 | 780 | 897 | 1,677 |
| 75 to 79 | 601 | 722 | 1,323 |
| 80 to 84 | 382 | 466 | 848 |
| 85+ | 260 | 520 | 780 |
Guernsey 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 | 19331 | 19860 | 39,191 |
| WAC | 19009 | 19635 | 38,644 |
| NHWAC | 18830 | 19451 | 38,281 |
| WA | 18637 | 19281 | 37,918 |
| NHWA | 18467 | 19113 | 37,580 |
| BAC | 604 | 495 | 1,099 |
| NHBAC | 597 | 475 | 1,072 |
| TOM | 395 | 382 | 777 |
| NHTOM | 385 | 365 | 750 |
| BA | 379 | 260 | 639 |
| NHBA | 376 | 252 | 628 |
| H | 191 | 208 | 399 |
| IAC | 191 | 186 | 377 |
| HWAC | 179 | 184 | 363 |
| NHIAC | 177 | 170 | 347 |
| HWA | 170 | 168 | 338 |
| AAC | 101 | 130 | 231 |
| NHAAC | 99 | 128 | 227 |
| AA | 45 | 80 | 125 |
| NHAA | 45 | 78 | 123 |
| IA | 59 | 58 | 117 |
| NHIA | 52 | 48 | 100 |
| NAC | 25 | 21 | 46 |
| NHNAC | 24 | 18 | 42 |
| HIAC | 14 | 16 | 30 |
| HTOM | 10 | 17 | 27 |
| HBAC | 7 | 20 | 27 |
| HIA | 7 | 10 | 17 |
| NA | 7 | 7 | 14 |
| HBA | 3 | 8 | 11 |
| NHNA | 6 | 4 | 10 |
| HAAC | 2 | 2 | 4 |
| HNAC | 1 | 3 | 4 |
| HNA | 1 | 3 | 4 |
| HAA | 0 | 2 | 2 |
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[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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