Last official estimated population of Nassau County was 1,341,500 (year 2014)[1]. This was 0.421% of total US population and 6.8% of total New York state population. Area of Nassau County is 453.5 mi² (=1174.5 km²), in this year population density was 2,958.26 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Nassau County population in 2026 would be 1,347,421 [0].
Historical population of Nassau County for period 1900-2014 [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

[1900-1910] +4.23 %/yr
[1910-1920] +4.16 %/yr
[1920-1930] +9.16 %/yr
[1930-1940] +2.99 %/yr
[1940-1950] +5.16 %/yr
[1950-1960] +6.81 %/yr
[1960-1970] +0.94 %/yr
[1970-1980] -0.77 %/yr
[1980-1990] -0.26 %/yr
[1990-2000] +0.36 %/yr
[2000-2005] -0.03 %/yr
[2005-2010] +0.11 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Nassau County? Visit this page: Settlements in Nassau County, NY
Population of Nassau County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 37381 | 35970 | 73,351 |
| 5 to 9 | 41426 | 39330 | 80,756 |
| 10 to 14 | 45531 | 43035 | 88,566 |
| 15 to 19 | 47695 | 45183 | 92,878 |
| 20 to 24 | 43797 | 42693 | 86,490 |
| 25 to 29 | 39747 | 37924 | 77,671 |
| 30 to 34 | 37543 | 38173 | 75,716 |
| 35 to 39 | 38404 | 39940 | 78,344 |
| 40 to 44 | 42464 | 44820 | 87,284 |
| 45 to 49 | 47749 | 51646 | 99,395 |
| 50 to 54 | 52366 | 56258 | 108,624 |
| 55 to 59 | 48942 | 52701 | 101,643 |
| 60 to 64 | 40634 | 44230 | 84,864 |
| 65 to 69 | 32636 | 36268 | 68,904 |
| 70 to 74 | 21599 | 26638 | 48,237 |
| 75 to 79 | 15318 | 21470 | 36,788 |
| 80 to 84 | 12259 | 18747 | 31,006 |
| 85+ | 13119 | 24991 | 38,110 |
Nassau 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 | 548097 | 591206 | 1,139,303 |
| WAC | 514263 | 538527 | 1,052,790 |
| WA | 505054 | 528794 | 1,033,848 |
| NHWAC | 416740 | 442699 | 859,439 |
| NHWA | 410284 | 436018 | 846,302 |
| H | 110513 | 108811 | 219,324 |
| HWAC | 97523 | 95828 | 193,351 |
| HWA | 94770 | 92776 | 187,546 |
| BAC | 84295 | 97772 | 182,067 |
| BA | 78890 | 91641 | 170,531 |
| NHBAC | 73948 | 86773 | 160,721 |
| NHBA | 70562 | 82969 | 153,531 |
| AAC | 64761 | 69331 | 134,092 |
| NHAAC | 63060 | 67491 | 130,551 |
| AA | 59431 | 63849 | 123,280 |
| NHAA | 58332 | 62728 | 121,060 |
| TOM | 11185 | 11996 | 23,181 |
| HBAC | 10347 | 10999 | 21,346 |
| HBA | 8328 | 8672 | 17,000 |
| NHTOM | 8024 | 8456 | 16,480 |
| IAC | 6173 | 6139 | 12,312 |
| HIAC | 3877 | 3531 | 7,408 |
| HTOM | 3161 | 3540 | 6,701 |
| IA | 3452 | 3084 | 6,536 |
| HIA | 2736 | 2283 | 5,019 |
| NHIAC | 2296 | 2608 | 4,904 |
| HAAC | 1701 | 1840 | 3,541 |
| NAC | 1113 | 1175 | 2,288 |
| HAA | 1099 | 1121 | 2,220 |
| NHIA | 716 | 801 | 1,517 |
| NA | 598 | 653 | 1,251 |
| NHNAC | 539 | 618 | 1,157 |
| HNAC | 574 | 557 | 1,131 |
| HNA | 419 | 419 | 838 |
| NHNA | 179 | 234 | 413 |
• Kings County population
20 mi,
250°
• Queens County
13.9 mi,
249°
• New York County
20.2 mi,
279°
• Bronx County
16.1 mi,
300°
• Westchester County
30.4 mi,
344°
• Fairfield County
36.3 mi,
18°
• Bergen County
29.9 mi,
302°
• Essex County
34.6 mi,
276°
• Hudson County
25.6 mi,
270°
• Richmond County
31.1 mi,
248°
[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
See note 11 New York Notes
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