Last official estimated population of Ontario County was 108,233 (year 2014)[1]. This was 0.034% of total US population and 0.5% of total New York state population. Area of Ontario County is 662.5 mi² (=1715.9 km²), in this year population density was 163.36 p/mi². If population growth rate would be same as in period 2010-2014 (+0.07%/yr), Ontario County population in 2023 would be 108,916 [0].
Historical population of Ontario County for period 1790-2014 [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
[1790-1800] +30.35 %/yr
[1800-1810] +10.69 %/yr
[1810-1820] +7.7 %/yr
[1820-1830] -7.54 %/yr
[1830-1840] +0.77 %/yr
[1840-1850] +0.1 %/yr
[1850-1860] +0.14 %/yr
[1860-1870] +0.12 %/yr
[1870-1880] +0.94 %/yr
[1880-1890] -0.22 %/yr
[1890-1900] +0.24 %/yr
[1900-1910] +0.53 %/yr
[1910-1920] +0.07 %/yr
[1920-1930] +0.3 %/yr
[1930-1940] +0.19 %/yr
[1940-1950] +0.85 %/yr
[1950-1960] +1.24 %/yr
[1960-1970] +1.48 %/yr
[1970-1980] +1.21 %/yr
[1980-1990] +0.68 %/yr
[1990-2000] +0.5 %/yr
[2000-2005] +0.84 %/yr
[2005-2010] +0.69 %/yr
[2010-2014] +0.07 %/yr
Looking for settlements in Ontario County? Visit this page: Settlements in Ontario County, NY
Population of Ontario County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2834 | 2615 | 5,449 |
| 5 to 9 | 3195 | 3056 | 6,251 |
| 10 to 14 | 3579 | 3302 | 6,881 |
| 15 to 19 | 3694 | 3688 | 7,382 |
| 20 to 24 | 3854 | 3613 | 7,467 |
| 25 to 29 | 3013 | 2855 | 5,868 |
| 30 to 34 | 2846 | 2892 | 5,738 |
| 35 to 39 | 2788 | 2852 | 5,640 |
| 40 to 44 | 3236 | 3319 | 6,555 |
| 45 to 49 | 3852 | 3977 | 7,829 |
| 50 to 54 | 4311 | 4595 | 8,906 |
| 55 to 59 | 4205 | 4316 | 8,521 |
| 60 to 64 | 3826 | 3966 | 7,792 |
| 65 to 69 | 3223 | 3446 | 6,669 |
| 70 to 74 | 2155 | 2392 | 4,547 |
| 75 to 79 | 1425 | 1762 | 3,187 |
| 80 to 84 | 971 | 1305 | 2,276 |
| 85+ | 902 | 1847 | 2,749 |
Ontario 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 | 51323 | 53632 | 104,955 |
| WAC | 51474 | 53469 | 104,943 |
| WA | 50595 | 52552 | 103,147 |
| NHWAC | 49244 | 51605 | 100,849 |
| NHWA | 48516 | 50838 | 99,354 |
| H | 2586 | 2166 | 4,752 |
| HWAC | 2230 | 1864 | 4,094 |
| BAC | 2071 | 1864 | 3,935 |
| HWA | 2079 | 1714 | 3,793 |
| NHBAC | 1709 | 1534 | 3,243 |
| BA | 1559 | 1312 | 2,871 |
| NHBA | 1292 | 1087 | 2,379 |
| TOM | 962 | 984 | 1,946 |
| AAC | 853 | 1015 | 1,868 |
| NHAAC | 823 | 985 | 1,808 |
| NHTOM | 802 | 826 | 1,628 |
| AA | 573 | 754 | 1,327 |
| NHAA | 562 | 742 | 1,304 |
| IAC | 444 | 405 | 849 |
| HBAC | 362 | 330 | 692 |
| NHIAC | 328 | 310 | 638 |
| HBA | 267 | 225 | 492 |
| IA | 200 | 176 | 376 |
| HTOM | 160 | 158 | 318 |
| NHIA | 141 | 130 | 271 |
| HIAC | 116 | 95 | 211 |
| NAC | 58 | 60 | 118 |
| HIA | 59 | 46 | 105 |
| NHNAC | 42 | 47 | 89 |
| HAAC | 30 | 30 | 60 |
| NA | 20 | 20 | 40 |
| HNAC | 16 | 13 | 29 |
| HAA | 11 | 12 | 23 |
| HNA | 10 | 11 | 21 |
| NHNA | 10 | 9 | 19 |
• Monroe County population
45.8 mi, 
336°
• Steuben County
41 mi, 
185°
• Wayne County
43.3 mi, 
16°
• Cayuga County
38.3 mi, 
74°
• Livingston County
25.3 mi, 
249°
• Genesee County
46.1 mi, 
282°
• Wyoming County
48.1 mi, 
257°
• Seneca County
24.7 mi, 
101°
• Yates County
18.1 mi, 
146°
• Schuyler County
35.4 mi, 148°
[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
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