Population Demographics for Lake Forest, Illinois in 2020, 2019
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| Total population in Lake Forest | | | Total Population: | 19,375 | | Male Population: | 9,344 | | Female Population: | 10,031 |
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| Median age in Lake Forest | | | Both sexes | 45 | | Male | 45 | | Female | 46 |
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| Population in households in Lake Forest | | | Total Population: | 18,139 | | Male Population: | 8,854 | | Under 5 years: | 382 | | 5 to 9 years: | 713 | | 10 to 14 years: | 904 | | 15 to 17 years: | 571 | | 18 and 19 years: | 197 | | 20 years: | 61 | | 21 years: | 54 | | 22 to 24 years: | 193 | | 25 to 29 years: | 202 | | 30 to 34 years: | 150 | | 35 to 39 years: | 260 | | 40 to 44 years: | 531 | | 45 to 49 years: | 783 | | 50 to 54 years: | 862 | | 55 to 59 years: | 776 | | 60 and 61 years: | 253 | | 62 to 64 years: | 427 | | 65 and 66 years: | 243 | | 67 to 69 years: | 257 | | 70 to 74 years: | 351 | | 75 to 79 years: | 278 | | 80 to 84 years: | 213 | | 85 years and over: | 193 | | Female Population: | 9,285 | | Under 5 years: | 368 | | 5 to 9 years: | 650 | | 10 to 14 years: | 854 | | 15 to 17 years: | 517 | | 18 and 19 years: | 138 | | 20 years: | 49 | | 21 years: | 41 | | 22 to 24 years: | 171 | | 25 to 29 years: | 170 | | 30 to 34 years: | 181 | | 35 to 39 years: | 370 | | 40 to 44 years: | 652 | | 45 to 49 years: | 899 | | 50 to 54 years: | 951 | | 55 to 59 years: | 819 | | 60 and 61 years: | 269 | | 62 to 64 years: | 412 | | 65 and 66 years: | 214 | | 67 to 69 years: | 278 | | 70 to 74 years: | 337 | | 75 to 79 years: | 299 | | 80 to 84 years: | 333 | | 85 years and over: | 313 |
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| Average household size in Lake Forest | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Lake Forest | | | Total: | 6,763 | | Family led homes: | 5,247 | | Husband-wife family: | 4,733 | | Other family: | 514 | | Population of male led with no wife present: | 130 | | Population female led with no husband present: | 384 | | Population of Nonfamily homes: | 1,516 | | Population living alone: | 1,368 | | Population not living alone: | 148 |
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| Total occupied homes in Lake Forest with people under 18 years old: | | | Total: | 6,763 | | Population of homes with one or more people under 18 years: | 2,392 | | Population of family homes: | 2,390 | | Husband-wife family: | 2,099 | | Under 6 years only: | 263 | | Under 6 years and 6 to 17 years: | 360 | | 6 to 17 years only: | 1,476 | | Other family: | 291 | | Male householder, no wife present: | 69 | | Under 6 years only: | 8 | | Under 6 years and 6 to 17 years: | 12 | | 6 to 17 years only: | 49 | | Female led with no husband present: | 222 | | Under 6 years only: | 14 | | Under 6 years and 6 to 17 years: | 17 | | 6 to 17 years only: | 191 | | Nonfamily households: | 2 | | Male led households: | 1 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 1 | | Female led householder: | 1 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 0 | | Households with no people under 18 years: | 4,371 | | Family households: | 2,857 | | Husband-wife family: | 2,634 | | Other family: | 223 | | Male led with no wife present: | 61 | | Female led with no husband present: | 162 | | Nonfamily households: | 1,514 | | Male led householder: | 540 | | Female led householder: | 974 |
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| Total number led homes in Lake Forest, by type | | | Total Home Population: | 6,763 | | Population of Family homes: | 5,247 | | Population of 15 to 24 year olds: | 11 | | Population of 25 to 34 year olds: | 139 | | Population of 35 to 44 year olds: | 782 | | Population of 45 to 54 year olds: | 1,659 | | Population of 55 to 59 year olds: | 713 | | Population of 60 to 64 year olds: | 624 | | Population of 65 to 74 year olds: | 755 | | Population of 75 to 84 year olds: | 428 | | Population of 85 year olds and over: | 136 | | Population of Nonfamily Homes: | 1,516 | | Population of 15 to 24 year olds: | 42 | | Population of 25 to 34 year olds: | 73 | | Population of 35 to 44 year olds: | 72 | | Population of 45 to 54 year olds: | 201 | | Population of 55 to 59 year olds: | 145 | | Population of 60 to 64 year olds: | 153 | | Population of 65 to 74 year olds: | 254 | | Population of 75 to 84 year olds: | 319 | | Population of 85 year olds and over: | 257 |
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| households in Lake Forest containing people over 60 | | | Total Population: | 6,763 | | Population of homes with one or more people 60 years and over: | 3,094 | | 1-person household: | 924 | | 2-or-more-person household: | 2,170 | | Family households: | 2,105 | | Nonfamily households: | 65 | | Population of homes with no people 60 years and over: | 3,669 | | 1-person household: | 444 | | 2-or-more-person household: | 3,225 | | Family homes: | 3,142 | | Nonfamily homes: | 83 |
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| homes in Lake Forest with multiple generations. | | | Total Population: | 6,763 | | Home has three or more generations: | 82 | | Home does not have three or more generations: | 6,681 |
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| Unmarried population in Lake Forest under 18 years old in homes | | | Total Population: | 4,958 | | Unmarried partner of home lead present: | 74 | | In family homes: | 74 | | Population of male led and male partner homes: | 16 | | Population of male led and female partner households: | 22 | | Population of female led and female partner households: | 13 | | Population of female led and male partner households: | 23 | | In nonfamily homes: | 0 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 0 | | 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: | 4,884 | | In family homes: | 4,882 | | Population of husband-wife family homes: | 4,421 | | Population of male lead with no wife present, family homes: | 87 | | Population of female lead with no husband present, family homes: | 374 | | In nonfamily homes: | 2 |
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| Population in families living in Lake Forest | | | Total Population: | 16,324 | | Population Under 18 years: | 4,951 | | Population 18 years and over: | 11,373 |
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| How long in Lake Forest have lived in one place. | | | Total: | 6,763 | | Population of Owner occupied homes: | 5,937 | | Family home: | 4,831 | | Nonfamily homess: | 1,106 | | Male led home: | 351 | | Living alone: | 306 | | Not living alone: | 45 | | Female led home: | 755 | | Living alone: | 709 | | Not living alone: | 46 | | Population of Renter occupied homes: | 826 | | Family run homes: | 416 | | Husband-wife family: | 302 | | Other family: | 114 | | Male led with no wife present: | 30 | | Female led with no husband present: | 84 | | Nonfamily Homes: | 410 | | Male led homes: | 190 | | Male living alone: | 154 | | Male not living alone: | 36 | | Female led homes: | 220 | | Females living alone: | 199 | | Females not living alone: | 21 |
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