Population Demographics for Stony Brook, New York in 2020, 2019
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| Total population in Stony Brook | | | Total Population: | 13,740 | | Male Population: | 6,727 | | Female Population: | 7,013 |
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| Median age in Stony Brook | | | Both sexes | 43 | | Male | 42 | | Female | 44 |
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| Population in households in Stony Brook | | | Total Population: | 13,645 | | Male Population: | 6,683 | | Under 5 years: | 338 | | 5 to 9 years: | 460 | | 10 to 14 years: | 568 | | 15 to 17 years: | 322 | | 18 and 19 years: | 150 | | 20 years: | 85 | | 21 years: | 80 | | 22 to 24 years: | 288 | | 25 to 29 years: | 293 | | 30 to 34 years: | 240 | | 35 to 39 years: | 368 | | 40 to 44 years: | 499 | | 45 to 49 years: | 571 | | 50 to 54 years: | 546 | | 55 to 59 years: | 428 | | 60 and 61 years: | 175 | | 62 to 64 years: | 269 | | 65 and 66 years: | 144 | | 67 to 69 years: | 190 | | 70 to 74 years: | 250 | | 75 to 79 years: | 181 | | 80 to 84 years: | 135 | | 85 years and over: | 103 | | Female Population: | 6,962 | | Under 5 years: | 339 | | 5 to 9 years: | 455 | | 10 to 14 years: | 502 | | 15 to 17 years: | 295 | | 18 and 19 years: | 116 | | 20 years: | 58 | | 21 years: | 65 | | 22 to 24 years: | 247 | | 25 to 29 years: | 248 | | 30 to 34 years: | 231 | | 35 to 39 years: | 399 | | 40 to 44 years: | 582 | | 45 to 49 years: | 618 | | 50 to 54 years: | 563 | | 55 to 59 years: | 499 | | 60 and 61 years: | 186 | | 62 to 64 years: | 261 | | 65 and 66 years: | 175 | | 67 to 69 years: | 227 | | 70 to 74 years: | 265 | | 75 to 79 years: | 227 | | 80 to 84 years: | 210 | | 85 years and over: | 194 |
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| Average household size in Stony Brook | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Stony Brook | | | Total: | 4,846 | | Family led homes: | 3,653 | | Husband-wife family: | 3,202 | | Other family: | 451 | | Population of male led with no wife present: | 109 | | Population female led with no husband present: | 342 | | Population of Nonfamily homes: | 1,193 | | Population living alone: | 930 | | Population not living alone: | 263 |
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| Total occupied homes in Stony Brook with people under 18 years old: | | | Total: | 4,846 | | Population of homes with one or more people under 18 years: | 1,749 | | Population of family homes: | 1,740 | | Husband-wife family: | 1,512 | | Under 6 years only: | 292 | | Under 6 years and 6 to 17 years: | 259 | | 6 to 17 years only: | 961 | | Other family: | 228 | | Male householder, no wife present: | 47 | | Under 6 years only: | 8 | | Under 6 years and 6 to 17 years: | 7 | | 6 to 17 years only: | 32 | | Female led with no husband present: | 181 | | Under 6 years only: | 20 | | Under 6 years and 6 to 17 years: | 21 | | 6 to 17 years only: | 140 | | Nonfamily households: | 9 | | Male led households: | 5 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 5 | | Female led householder: | 4 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 3,097 | | Family households: | 1,913 | | Husband-wife family: | 1,690 | | Other family: | 223 | | Male led with no wife present: | 62 | | Female led with no husband present: | 161 | | Nonfamily households: | 1,184 | | Male led householder: | 474 | | Female led householder: | 710 |
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| Total number led homes in Stony Brook, by type | | | Total Home Population: | 4,846 | | Population of Family homes: | 3,653 | | Population of 15 to 24 year olds: | 14 | | Population of 25 to 34 year olds: | 146 | | Population of 35 to 44 year olds: | 791 | | Population of 45 to 54 year olds: | 1,049 | | Population of 55 to 59 year olds: | 424 | | Population of 60 to 64 year olds: | 389 | | Population of 65 to 74 year olds: | 509 | | Population of 75 to 84 year olds: | 267 | | Population of 85 year olds and over: | 64 | | Population of Nonfamily Homes: | 1,193 | | Population of 15 to 24 year olds: | 80 | | Population of 25 to 34 year olds: | 101 | | Population of 35 to 44 year olds: | 70 | | Population of 45 to 54 year olds: | 133 | | Population of 55 to 59 year olds: | 83 | | Population of 60 to 64 year olds: | 109 | | Population of 65 to 74 year olds: | 229 | | Population of 75 to 84 year olds: | 243 | | Population of 85 year olds and over: | 145 |
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| households in Stony Brook containing people over 60 | | | Total Population: | 4,846 | | Population of homes with one or more people 60 years and over: | 2,171 | | 1-person household: | 650 | | 2-or-more-person household: | 1,521 | | Family households: | 1,438 | | Nonfamily households: | 83 | | Population of homes with no people 60 years and over: | 2,675 | | 1-person household: | 280 | | 2-or-more-person household: | 2,395 | | Family homes: | 2,215 | | Nonfamily homes: | 180 |
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| homes in Stony Brook with multiple generations. | | | Total Population: | 4,846 | | Home has three or more generations: | 202 | | Home does not have three or more generations: | 4,644 |
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| Unmarried population in Stony Brook under 18 years old in homes | | | Total Population: | 3,278 | | Unmarried partner of home lead present: | 73 | | In family homes: | 71 | | Population of male led and male partner homes: | 7 | | Population of male led and female partner households: | 26 | | Population of female led and female partner households: | 7 | | Population of female led and male partner households: | 31 | | In nonfamily homes: | 2 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 2 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 3,205 | | In family homes: | 3,199 | | Population of husband-wife family homes: | 2,903 | | Population of male lead with no wife present, family homes: | 46 | | Population of female lead with no husband present, family homes: | 250 | | In nonfamily homes: | 6 |
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| Population in families living in Stony Brook | | | Total Population: | 11,753 | | Population Under 18 years: | 3,255 | | Population 18 years and over: | 8,498 |
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| How long in Stony Brook have lived in one place. | | | Total: | 4,846 | | Population of Owner occupied homes: | 4,361 | | Family home: | 3,475 | | Nonfamily homess: | 886 | | Male led home: | 308 | | Living alone: | 248 | | Not living alone: | 60 | | Female led home: | 578 | | Living alone: | 506 | | Not living alone: | 72 | | Population of Renter occupied homes: | 485 | | Family run homes: | 178 | | Husband-wife family: | 120 | | Other family: | 58 | | Male led with no wife present: | 13 | | Female led with no husband present: | 45 | | Nonfamily Homes: | 307 | | Male led homes: | 171 | | Male living alone: | 82 | | Male not living alone: | 89 | | Female led homes: | 136 | | Females living alone: | 94 | | Females not living alone: | 42 |
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