Last official estimated population of Onondaga County was 467,422 (year 2014)[1]. This was 0.147% of total US population and 2.4% of total New York state population. Area of Onondaga County is 805.6 mi² (=2086.5 km²), in this year population density was 580.20 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Onondaga County population in 2025 would be 468,513 [0].
Historical population of Onondaga County for period 1800-2014 [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

[1800-1810] +12.94 %/yr
[1810-1820] +4.78 %/yr
[1820-1830] +3.58 %/yr
[1830-1840] +1.42 %/yr
[1840-1850] +2.38 %/yr
[1850-1860] +0.54 %/yr
[1860-1870] +1.4 %/yr
[1870-1880] +1.24 %/yr
[1880-1890] +2.18 %/yr
[1890-1900] +1.44 %/yr
[1900-1910] +1.73 %/yr
[1910-1920] +1.89 %/yr
[1920-1930] +1.9 %/yr
[1930-1940] +0.12 %/yr
[1940-1950] +1.48 %/yr
[1950-1960] +2.16 %/yr
[1960-1970] +1.12 %/yr
[1970-1980] -0.19 %/yr
[1980-1990] +0.11 %/yr
[1990-2000] -0.23 %/yr
[2000-2005] +0.11 %/yr
[2005-2010] +0.26 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Onondaga County? Visit this page: Settlements in Onondaga County, NY
Population of Onondaga County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 13662 | 13364 | 27,026 |
| 5 to 9 | 14157 | 13313 | 27,470 |
| 10 to 14 | 15080 | 14471 | 29,551 |
| 15 to 19 | 16931 | 17371 | 34,302 |
| 20 to 24 | 16959 | 17567 | 34,526 |
| 25 to 29 | 16173 | 16157 | 32,330 |
| 30 to 34 | 14220 | 14710 | 28,930 |
| 35 to 39 | 12338 | 13215 | 25,553 |
| 40 to 44 | 13096 | 14050 | 27,146 |
| 45 to 49 | 15285 | 16173 | 31,458 |
| 50 to 54 | 17187 | 18301 | 35,488 |
| 55 to 59 | 16472 | 17536 | 34,008 |
| 60 to 64 | 13814 | 14921 | 28,735 |
| 65 to 69 | 10482 | 11842 | 22,324 |
| 70 to 74 | 7211 | 8777 | 15,988 |
| 75 to 79 | 5065 | 6780 | 11,845 |
| 80 to 84 | 3970 | 5828 | 9,798 |
| 85+ | 3942 | 7776 | 11,718 |
Onondaga 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 | 215377 | 231324 | 446,701 |
| WAC | 189110 | 201539 | 390,649 |
| WA | 183194 | 195394 | 378,588 |
| NHWAC | 181070 | 193538 | 374,608 |
| NHWA | 175906 | 188170 | 364,076 |
| BAC | 30179 | 33229 | 63,408 |
| NHBAC | 27579 | 30381 | 57,960 |
| BA | 26113 | 28891 | 55,004 |
| NHBA | 24077 | 26652 | 50,729 |
| H | 10667 | 10828 | 21,495 |
| AAC | 9761 | 10443 | 20,204 |
| NHAAC | 9588 | 10260 | 19,848 |
| AA | 8067 | 8755 | 16,822 |
| NHAA | 7965 | 8642 | 16,607 |
| HWAC | 8040 | 8001 | 16,041 |
| HWA | 7288 | 7224 | 14,512 |
| TOM | 6546 | 6823 | 13,369 |
| NHTOM | 5737 | 5970 | 11,707 |
| IAC | 3650 | 3881 | 7,531 |
| NHIAC | 3005 | 3244 | 6,249 |
| HBAC | 2600 | 2848 | 5,448 |
| HBA | 2036 | 2239 | 4,275 |
| IA | 2014 | 2182 | 4,196 |
| NHIA | 1627 | 1819 | 3,446 |
| HTOM | 809 | 853 | 1,662 |
| HIAC | 645 | 637 | 1,282 |
| HIA | 387 | 363 | 750 |
| NAC | 299 | 298 | 597 |
| NHNAC | 229 | 237 | 466 |
| HAAC | 173 | 183 | 356 |
| NA | 110 | 107 | 217 |
| HAA | 102 | 113 | 215 |
| NHNA | 65 | 71 | 136 |
| HNAC | 70 | 61 | 131 |
| HNA | 45 | 36 | 81 |
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31.4 mi,
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• Tompkins County
40.8 mi,
200°
• Wayne County
53.7 mi,
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• Cayuga County
19.1 mi,
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• Madison County
27.7 mi,
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• Chenango County
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• Cortland County
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• Seneca County
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• Yates County
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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
*Montgomery New York Notes
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