Last official estimated population of Putnam County was 99,775 (year 2014)[1]. This was 0.031% of total US population and 0.5% of total New York state population. Area of Putnam County is 246.3 mi² (=637.8 km²), in this year population density was 405.18 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Putnam County population in 2026 would be 99,970 [0].
Historical population of Putnam County for period 1820-2014 [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
[1820-1830] +1.15 %/yr
[1830-1840] +0.15 %/yr
[1840-1850] +0.98 %/yr
[1850-1860] -0.1 %/yr
[1860-1870] +0.97 %/yr
[1870-1880] -0.16 %/yr
[1880-1890] -0.22 %/yr
[1890-1900] -0.74 %/yr
[1900-1910] +0.62 %/yr
[1910-1920] -3.01 %/yr
[1920-1930] +2.44 %/yr
[1930-1940] +1.88 %/yr
[1940-1950] +2.06 %/yr
[1950-1960] +4.56 %/yr
[1960-1970] +5.98 %/yr
[1970-1980] +3.13 %/yr
[1980-1990] +0.84 %/yr
[1990-2000] +1.32 %/yr
[2000-2005] +0.79 %/yr
[2005-2010] +0.03 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Putnam County? Visit this page: Settlements in Putnam County, NY
Population of Putnam County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2263 | 2257 | 4,520 |
| 5 to 9 | 2844 | 2694 | 5,538 |
| 10 to 14 | 3484 | 3313 | 6,797 |
| 15 to 19 | 3592 | 3339 | 6,931 |
| 20 to 24 | 3204 | 2790 | 5,994 |
| 25 to 29 | 2636 | 2330 | 4,966 |
| 30 to 34 | 2605 | 2434 | 5,039 |
| 35 to 39 | 2678 | 2690 | 5,368 |
| 40 to 44 | 3398 | 3527 | 6,925 |
| 45 to 49 | 4211 | 4307 | 8,518 |
| 50 to 54 | 4581 | 4836 | 9,417 |
| 55 to 59 | 4158 | 4093 | 8,251 |
| 60 to 64 | 3227 | 3280 | 6,507 |
| 65 to 69 | 2552 | 2670 | 5,222 |
| 70 to 74 | 1757 | 1941 | 3,698 |
| 75 to 79 | 1081 | 1312 | 2,393 |
| 80 to 84 | 690 | 935 | 1,625 |
| 85+ | 566 | 1212 | 1,778 |
Putnam 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 |
| WAC | 46571 | 46816 | 93,387 |
| WA | 45738 | 46073 | 91,811 |
| NH | 42820 | 43693 | 86,513 |
| NHWAC | 40378 | 41093 | 81,471 |
| NHWA | 39791 | 40567 | 80,358 |
| H | 6707 | 6267 | 12,974 |
| HWAC | 6193 | 5723 | 11,916 |
| HWA | 5947 | 5506 | 11,453 |
| BAC | 2011 | 1889 | 3,900 |
| BA | 1603 | 1533 | 3,136 |
| AAC | 1401 | 1611 | 3,012 |
| NHBAC | 1541 | 1415 | 2,956 |
| NHAAC | 1314 | 1521 | 2,835 |
| NHBA | 1284 | 1197 | 2,481 |
| AA | 1066 | 1323 | 2,389 |
| NHAA | 1014 | 1265 | 2,279 |
| TOM | 933 | 827 | 1,760 |
| NHTOM | 658 | 584 | 1,242 |
| HBAC | 470 | 474 | 944 |
| IAC | 422 | 433 | 855 |
| HBA | 319 | 336 | 655 |
| HTOM | 275 | 243 | 518 |
| NHIAC | 216 | 216 | 432 |
| HIAC | 206 | 217 | 423 |
| IA | 149 | 188 | 337 |
| HIA | 87 | 115 | 202 |
| HAAC | 87 | 90 | 177 |
| NAC | 93 | 62 | 155 |
| NHIA | 62 | 73 | 135 |
| HAA | 52 | 58 | 110 |
| NHNAC | 51 | 43 | 94 |
| HNAC | 42 | 19 | 61 |
| NA | 38 | 16 | 54 |
| HNA | 27 | 9 | 36 |
| NHNA | 11 | 7 | 18 |
• Bronx County population
40.4 mi, 
188°
• Westchester County
19 mi, 
180°
• Fairfield County
24 mi, 
125°
• Bergen County
36.6 mi, 
208°
• New Haven County
44.1 mi, 
97°
• Passaic County
39.4 mi, 
226°
• Orange County
29.2 mi, 
266°
• Rockland County
23.9 mi, 
217°
• Dutchess County
22.6 mi, 
0°
• Litchfield County
36.4 mi, 
46°
[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
*Dutchess New York Notes
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