Last official estimated population of Suffolk County was 1,494,744 (year 2014)[1]. This was 0.469% of total US population and 7.6% of total New York state population. Area of Suffolk County is 2,373.1 mi² (=6146.4 km²), in this year population density was 629.86 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Suffolk County population in 2025 would be 1,498,584 [0].
Historical population of Suffolk 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] +1.84 %/yr
[1800-1810] +0.68 %/yr
[1810-1820] +1.4 %/yr
[1820-1830] +0.99 %/yr
[1830-1840] +1.94 %/yr
[1840-1850] +1.29 %/yr
[1850-1860] +1.6 %/yr
[1860-1870] +0.81 %/yr
[1870-1880] +1.39 %/yr
[1880-1890] +1.49 %/yr
[1890-1900] +2.19 %/yr
[1900-1910] +2.17 %/yr
[1910-1920] +1.38 %/yr
[1920-1930] +3.86 %/yr
[1930-1940] +2.05 %/yr
[1940-1950] +3.42 %/yr
[1950-1960] +9.22 %/yr
[1960-1970] +5.37 %/yr
[1970-1980] +1.33 %/yr
[1980-1990] +0.29 %/yr
[1990-2000] +0.72 %/yr
[2000-2005] +0.81 %/yr
[2005-2010] +0.21 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Suffolk County? Visit this page: Settlements in Suffolk County, NY
Population of Suffolk County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 41423 | 39548 | 80,971 |
| 5 to 9 | 45844 | 43563 | 89,407 |
| 10 to 14 | 51338 | 48691 | 100,029 |
| 15 to 19 | 53601 | 49953 | 103,554 |
| 20 to 24 | 51914 | 49103 | 101,017 |
| 25 to 29 | 45583 | 41470 | 87,053 |
| 30 to 34 | 42368 | 40898 | 83,266 |
| 35 to 39 | 43776 | 43775 | 87,551 |
| 40 to 44 | 49657 | 51432 | 101,089 |
| 45 to 49 | 57817 | 60074 | 117,891 |
| 50 to 54 | 62030 | 63521 | 125,551 |
| 55 to 59 | 54121 | 55271 | 109,392 |
| 60 to 64 | 42034 | 45057 | 87,091 |
| 65 to 69 | 34544 | 39612 | 74,156 |
| 70 to 74 | 24606 | 30130 | 54,736 |
| 75 to 79 | 16824 | 21763 | 38,587 |
| 80 to 84 | 12215 | 17390 | 29,605 |
| 85+ | 10745 | 21277 | 32,022 |
Suffolk 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 | 643494 | 659423 | 1,302,917 |
| WA | 632244 | 648123 | 1,280,367 |
| NH | 599246 | 630099 | 1,229,345 |
| NHWAC | 516226 | 540690 | 1,056,916 |
| NHWA | 508332 | 532563 | 1,040,895 |
| H | 141194 | 132429 | 273,623 |
| HWAC | 127268 | 118733 | 246,001 |
| HWA | 123912 | 115560 | 239,472 |
| BAC | 67965 | 73053 | 141,018 |
| BA | 60381 | 65031 | 125,412 |
| NHBAC | 56292 | 61309 | 117,601 |
| NHBA | 51389 | 55912 | 107,301 |
| AAC | 34109 | 35715 | 69,824 |
| NHAAC | 32660 | 34235 | 66,895 |
| AA | 29478 | 31086 | 60,564 |
| NHAA | 28520 | 30088 | 58,608 |
| TOM | 13181 | 13479 | 26,660 |
| HBAC | 11673 | 11744 | 23,417 |
| NHTOM | 9395 | 9862 | 19,257 |
| HBA | 8992 | 9119 | 18,111 |
| IAC | 8188 | 8114 | 16,302 |
| IA | 4475 | 4202 | 8,677 |
| HIAC | 4505 | 4010 | 8,515 |
| NHIAC | 3683 | 4104 | 7,787 |
| HTOM | 3786 | 3617 | 7,403 |
| HIA | 3049 | 2690 | 5,739 |
| NHIA | 1426 | 1512 | 2,938 |
| HAAC | 1449 | 1480 | 2,929 |
| NAC | 1154 | 1092 | 2,246 |
| HAA | 958 | 998 | 1,956 |
| NA | 681 | 607 | 1,288 |
| HNAC | 632 | 578 | 1,210 |
| NHNAC | 522 | 514 | 1,036 |
| HNA | 497 | 445 | 942 |
| NHNA | 184 | 162 | 346 |
• Queens County population
63.1 mi, 
251°
• Bronx County
61 mi, 
263°
• Nassau County
49.2 mi, 252°
• Westchester County
56.8 mi, 
284°
• Fairfield County
40.2 mi, 
299°
• Hartford County
59.6 mi, 
357°
• New Haven County
30.1 mi, 
338°
• New London County
47.5 mi, 
39°
• Middlesex County
34.9 mi, 
14°
• Putnam County
64.1 mi, 301°
[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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