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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of Islip. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for Islip, New York is approximatly 20575.
Racial profile for Islip:
| White : | 18038 |
| Black : | 1008 |
| Native American : | 21 |
| Asian : | 425 |
| Pacific Islander : | 6 |
| Other : | 621 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in Islip, New York :
| 18 - 19 : | 183 |
| 20 : | 90 |
| 21 : | 95 |
| 22 - 24 : | 297 |
| 25 - 29 : | 612 |
| 30 - 34 : | 784 |
| 35 - 39 : | 975 |
| 40 - 44 : | 923 |
| 45 - 49 : | 669 |
| 50 - 54 : | 597 |
| 55 - 59 : | 475 |
| 60 - 61 : | 185 |
| 62 - 64 : | 239 |
| 65 - 66 : | 145 |
| 67 - 69 : | 210 |
| 70 - 74 : | 272 |
| 75 - 79 : | 176 |
| 80 - 84 : | 89 |
| 85+ : | 58 |
Population by age for females in Islip, New York :
| 18 - 19 : | 197 |
| 20 : | 88 |
| 21 : | 79 |
| 22 - 24 : | 316 |
| 25 - 29 : | 620 |
| 30 - 34 : | 851 |
| 35 - 39 : | 1015 |
| 40 - 44 : | 936 |
| 45 - 49 : | 710 |
| 50 - 54 : | 665 |
| 55 - 59 : | 549 |
| 60 - 61 : | 205 |
| 62 - 64 : | 292 |
| 65 - 66 : | 157 |
| 67 - 69 : | 187 |
| 70 - 74 : | 333 |
| 75 - 79 : | 269 |
| 80 - 84 : | 198 |
| 85+ : | 194 |
The total amount of households in Islip, New York is 6868. With 20432 people of the population in these households. The average household size is 2.97.
17937 people in Islip, New York are part of a family. The average family size in Islip is 3.38 people.
There are 4325 married families in Islip, New York.
Number of married families by number of members in the family :
| 0 - 2 : | 716 | 3 - 4 : | 548 | 5 : | 245 | 6 - 11 : | 1615 | 12 - 17 : | 1201 |