Last official estimated population of Rensselaer County was 159,346 (year 2014)[1]. This was 0.05% of total US population and 0.8% of total New York state population. Area of Rensselaer County is 665.4 mi² (=1723.4 km²), in this year population density was 239.48 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Rensselaer County population in 2026 would be 159,097 [0].
Historical population of Rensselaer 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] +1.81 %/yr
[1810-1820] +1.01 %/yr
[1820-1830] +2.1 %/yr
[1830-1840] +2 %/yr
[1840-1850] +1.99 %/yr
[1850-1860] +1.64 %/yr
[1860-1870] +1.44 %/yr
[1870-1880] +1.48 %/yr
[1880-1890] +0.77 %/yr
[1890-1900] -0.23 %/yr
[1900-1910] +0.05 %/yr
[1910-1920] -0.77 %/yr
[1920-1930] +0.57 %/yr
[1930-1940] +0.17 %/yr
[1940-1950] +0.85 %/yr
[1950-1960] +0.73 %/yr
[1960-1970] +0.68 %/yr
[1970-1980] -0.04 %/yr
[1980-1990] +0.16 %/yr
[1990-2000] -0.12 %/yr
[2000-2005] +0.46 %/yr
[2005-2010] +0.42 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Rensselaer County? Visit this page: Settlements in Rensselaer County, NY
Population of Rensselaer County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4416 | 4085 | 8,501 |
| 5 to 9 | 4486 | 4275 | 8,761 |
| 10 to 14 | 4587 | 4592 | 9,179 |
| 15 to 19 | 6091 | 5051 | 11,142 |
| 20 to 24 | 6350 | 5491 | 11,841 |
| 25 to 29 | 5891 | 5561 | 11,452 |
| 30 to 34 | 4910 | 5132 | 10,042 |
| 35 to 39 | 4510 | 4594 | 9,104 |
| 40 to 44 | 4805 | 4948 | 9,753 |
| 45 to 49 | 5349 | 5628 | 10,977 |
| 50 to 54 | 5949 | 6393 | 12,342 |
| 55 to 59 | 5820 | 6149 | 11,969 |
| 60 to 64 | 5093 | 5282 | 10,375 |
| 65 to 69 | 4038 | 4347 | 8,385 |
| 70 to 74 | 2556 | 3046 | 5,602 |
| 75 to 79 | 1766 | 2242 | 4,008 |
| 80 to 84 | 1214 | 1743 | 2,957 |
| 85+ | 1074 | 2310 | 3,384 |
Rensselaer 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 | 75297 | 77333 | 152,630 |
| WAC | 70717 | 72548 | 143,265 |
| WA | 68959 | 70776 | 139,735 |
| NHWAC | 67910 | 69885 | 137,795 |
| NHWA | 66441 | 68326 | 134,767 |
| BAC | 6851 | 7138 | 13,989 |
| NHBAC | 6011 | 6269 | 12,280 |
| BA | 5738 | 5984 | 11,722 |
| NHBA | 5121 | 5279 | 10,400 |
| H | 3608 | 3536 | 7,144 |
| HWAC | 2807 | 2663 | 5,470 |
| HWA | 2518 | 2450 | 4,968 |
| AAC | 2545 | 2403 | 4,948 |
| NHAAC | 2481 | 2341 | 4,822 |
| AA | 2054 | 1920 | 3,974 |
| NHAA | 2011 | 1874 | 3,885 |
| TOM | 1873 | 1896 | 3,769 |
| NHTOM | 1565 | 1670 | 3,235 |
| HBAC | 840 | 869 | 1,709 |
| HBA | 617 | 705 | 1,322 |
| IAC | 635 | 639 | 1,274 |
| NHIAC | 445 | 483 | 928 |
| HTOM | 308 | 226 | 534 |
| IA | 248 | 264 | 512 |
| HIAC | 190 | 156 | 346 |
| NHIA | 141 | 168 | 309 |
| HIA | 107 | 96 | 203 |
| NAC | 103 | 98 | 201 |
| NHNAC | 76 | 79 | 155 |
| HAAC | 64 | 62 | 126 |
| HAA | 43 | 46 | 89 |
| NA | 33 | 29 | 62 |
| HNAC | 27 | 19 | 46 |
| NHNA | 18 | 16 | 34 |
| HNA | 15 | 13 | 28 |
• Albany County population
24.9 mi,
250°
• Saratoga County
32.3 mi,
327°
• Schenectady County
27.9 mi,
285°
• Berkshire County
27.7 mi,
146°
• Franklin County
47.7 mi,
100°
• Washington County
41.8 mi,
5°
• Columbia County
32.5 mi,
190°
• Greene County
43.6 mi,
227°
• Windham County
44.7 mi,
63°
• Bennington County
30.3 mi,
42°
[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
*Albany New York Notes
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