Last official estimated population of Jefferson County was 116,595 (year 2014)[1]. This was 0.037% of total US population and 0.6% of total New York state population. Area of Jefferson County is 1,857.2 mi² (=4810.2 km²), in this year population density was 62.78 p/mi². If population growth rate would be same as in period 2010-2014 (+0.08%/yr), Jefferson County population in 2025 would be 117,607 [0].
Historical population of Jefferson 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] +8.09 %/yr
[1820-1830] +3.94 %/yr
[1830-1840] +2.32 %/yr
[1840-1850] +1.12 %/yr
[1850-1860] +0.24 %/yr
[1860-1870] -0.65 %/yr
[1870-1880] +0.1 %/yr
[1880-1890] +0.4 %/yr
[1890-1900] +1.1 %/yr
[1900-1910] +0.46 %/yr
[1910-1920] +0.23 %/yr
[1920-1930] +0.16 %/yr
[1930-1940] +0.05 %/yr
[1940-1950] +0.18 %/yr
[1950-1960] +0.27 %/yr
[1960-1970] +0.08 %/yr
[1970-1980] -0.04 %/yr
[1980-1990] +2.33 %/yr
[1990-2000] +0.07 %/yr
[2000-2005] +0.31 %/yr
[2005-2010] +0.48 %/yr
[2010-2014] +0.08 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, NY
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 5250 | 5110 | 10,360 |
| 5 to 9 | 4110 | 3928 | 8,038 |
| 10 to 14 | 3525 | 3534 | 7,059 |
| 15 to 19 | 3658 | 3180 | 6,838 |
| 20 to 24 | 7903 | 4831 | 12,734 |
| 25 to 29 | 6444 | 4705 | 11,149 |
| 30 to 34 | 4956 | 4190 | 9,146 |
| 35 to 39 | 3812 | 3308 | 7,120 |
| 40 to 44 | 3407 | 3124 | 6,531 |
| 45 to 49 | 3351 | 3218 | 6,569 |
| 50 to 54 | 3439 | 3548 | 6,987 |
| 55 to 59 | 3211 | 3349 | 6,560 |
| 60 to 64 | 2725 | 2755 | 5,480 |
| 65 to 69 | 2342 | 2443 | 4,785 |
| 70 to 74 | 1718 | 1836 | 3,554 |
| 75 to 79 | 1091 | 1329 | 2,420 |
| 80 to 84 | 735 | 1086 | 1,821 |
| 85+ | 606 | 1346 | 1,952 |
Jefferson 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 | 57210 | 53188 | 110,398 |
| WAC | 55605 | 52143 | 107,748 |
| WA | 54013 | 50708 | 104,721 |
| NHWAC | 51324 | 49071 | 100,395 |
| NHWA | 49980 | 47889 | 97,869 |
| BAC | 5828 | 3734 | 9,562 |
| H | 5073 | 3632 | 8,705 |
| NHBAC | 5138 | 3230 | 8,368 |
| BA | 4947 | 2880 | 7,827 |
| HWAC | 4281 | 3072 | 7,353 |
| NHBA | 4406 | 2546 | 6,952 |
| HWA | 4033 | 2819 | 6,852 |
| TOM | 1732 | 1566 | 3,298 |
| AAC | 1507 | 1540 | 3,047 |
| NHAAC | 1392 | 1431 | 2,823 |
| NHTOM | 1470 | 1303 | 2,773 |
| AA | 966 | 1112 | 2,078 |
| NHAA | 884 | 1022 | 1,906 |
| IAC | 856 | 767 | 1,623 |
| NHIAC | 652 | 590 | 1,242 |
| HBAC | 690 | 504 | 1,194 |
| HBA | 541 | 334 | 875 |
| IA | 425 | 377 | 802 |
| NHIA | 310 | 281 | 591 |
| NAC | 295 | 265 | 560 |
| HTOM | 262 | 263 | 525 |
| NHNAC | 247 | 224 | 471 |
| HIAC | 204 | 177 | 381 |
| NA | 200 | 177 | 377 |
| NHNA | 160 | 147 | 307 |
| HAAC | 115 | 109 | 224 |
| HIA | 115 | 96 | 211 |
| HAA | 82 | 90 | 172 |
| HNAC | 48 | 41 | 89 |
| HNA | 40 | 30 | 70 |
• Onondaga County population
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185°
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37.8 mi, 191°
• St. Lawrence County
59.2 mi, 
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• Wayne County
62.6 mi, 
233°
• Cayuga County
73.1 mi, 
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• Herkimer County
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• Lewis County
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• Hamilton County
80.7 mi, 
106°
[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
*Oneida New York Notes
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