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| General Information: | |
| City Class | Census Designated Place |
| Class by Population | 6 |
| Land Area | 6.956 |
| Water Bodies | 0 |
| State | New York |
| Population(2000) | 17006 |
| Males: | 8332 |
| Females : | 8674 |
Map of Holtsville, New York:
| Races in Holtsville: | |
| White | 16049 |
| Black/African American | 189 |
| Hispanic | 1200 |
| Asian | 296 |
| American Indian & Alaska Native | 31 |
| Native Hawaian Pacific Islander | 1 |
| Multi Race | 235 |
| Ohter Race | 205 |
| Population by Age: | |
| Under 5 years | 1385 |
| 5 to 17 Years | 3416 |
| 18 to 21 years | 708 |
| 22 to 29 years | 1647 |
| 30 to 39 yeras | 3199 |
| 40 to 49 years | 2658 |
| 50 to 64 years | 2820 |
| 64 and over | 1173 |
| Population Median Age: | |
| Average Median Age | 34.5 |
| Male Median Age | 33.8 |
| Female Median Age | 35.2 |
| Housing Information in Holtsville , NY | |
| Total Housing Units | 5418 |
| Urban Housing Units | NA |
| Rural Housing Unit | NA |
| Vacant Housing Units | 102 |
| Owner Occupied Housing Units | 4551 |
| Renter Occupied Housing Units | 765 |
| Family & Family Size in Holtsville , NY: | |
| Number of families | 4456 |
| Average Family size | 3.47 |
| Househols Information in Holtsville , NY: | |
| Number of Household | 5316 |
| Average Household Size | 3.19 |
| 1-person household, male | 263 |
| 1-person household, female : | 374 |
| Family HH(married-couple family, w/ own childern under 18 yrs) | 2030 |
| Family HH(married-couple family, no own childern under 18 yrs) | 1712 |
| Family HH, other family, male HH, no wife present, w/ own childern under 18 yrs | 72 |
| Family HH, other family, female HH, no husband present, w/ own childern under 18 yrs | 219 |
Zip code in Holtsville, New York:
| 00501 | 00544 | 11742 |