Population Demographics for Knox County, Maine in 2020, 2019
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| Total population in Knox County | | | Total Population: | 39,736 | | Male Population: | 19,663 | | Female Population: | 20,073 |
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| Median age in Knox County | | | Both sexes | 46 | | Male | 44 | | Female | 47 |
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| Population in households in Knox County | | | Total Population: | 38,375 | | Male Population: | 18,486 | | Under 5 years: | 1,002 | | 5 to 9 years: | 1,106 | | 10 to 14 years: | 1,132 | | 15 to 17 years: | 729 | | 18 and 19 years: | 377 | | 20 years: | 136 | | 21 years: | 139 | | 22 to 24 years: | 517 | | 25 to 29 years: | 864 | | 30 to 34 years: | 919 | | 35 to 39 years: | 1,100 | | 40 to 44 years: | 1,171 | | 45 to 49 years: | 1,393 | | 50 to 54 years: | 1,539 | | 55 to 59 years: | 1,587 | | 60 and 61 years: | 609 | | 62 to 64 years: | 891 | | 65 and 66 years: | 485 | | 67 to 69 years: | 614 | | 70 to 74 years: | 746 | | 75 to 79 years: | 570 | | 80 to 84 years: | 480 | | 85 years and over: | 380 | | Female Population: | 19,889 | | Under 5 years: | 916 | | 5 to 9 years: | 991 | | 10 to 14 years: | 1,163 | | 15 to 17 years: | 664 | | 18 and 19 years: | 356 | | 20 years: | 150 | | 21 years: | 126 | | 22 to 24 years: | 549 | | 25 to 29 years: | 912 | | 30 to 34 years: | 960 | | 35 to 39 years: | 1,118 | | 40 to 44 years: | 1,268 | | 45 to 49 years: | 1,506 | | 50 to 54 years: | 1,753 | | 55 to 59 years: | 1,760 | | 60 and 61 years: | 655 | | 62 to 64 years: | 917 | | 65 and 66 years: | 486 | | 67 to 69 years: | 683 | | 70 to 74 years: | 919 | | 75 to 79 years: | 702 | | 80 to 84 years: | 648 | | 85 years and over: | 687 |
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| Average household size in Knox County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Knox County | | | Total: | 17,258 | | Family led homes: | 10,662 | | Husband-wife family: | 8,312 | | Other family: | 2,350 | | Population of male led with no wife present: | 731 | | Population female led with no husband present: | 1,619 | | Population of Nonfamily homes: | 6,596 | | Population living alone: | 5,352 | | Population not living alone: | 1,244 |
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| Total occupied homes in Knox County with people under 18 years old: | | | Total: | 17,258 | | Population of homes with one or more people under 18 years: | 4,387 | | Population of family homes: | 4,314 | | Husband-wife family: | 2,739 | | Under 6 years only: | 598 | | Under 6 years and 6 to 17 years: | 530 | | 6 to 17 years only: | 1,611 | | Other family: | 1,575 | | Male householder, no wife present: | 517 | | Under 6 years only: | 132 | | Under 6 years and 6 to 17 years: | 73 | | 6 to 17 years only: | 312 | | Female led with no husband present: | 1,058 | | Under 6 years only: | 241 | | Under 6 years and 6 to 17 years: | 157 | | 6 to 17 years only: | 660 | | Nonfamily households: | 73 | | Male led households: | 58 | | Under 6 years only: | 11 | | Under 6 years and 6 to 17 years: | 4 | | 6 to 17 years only: | 43 | | Female led householder: | 15 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 11 | | Households with no people under 18 years: | 12,871 | | Family households: | 6,348 | | Husband-wife family: | 5,573 | | Other family: | 775 | | Male led with no wife present: | 214 | | Female led with no husband present: | 561 | | Nonfamily households: | 6,523 | | Male led householder: | 2,860 | | Female led householder: | 3,663 |
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| Total number led homes in Knox County, by type | | | Total Home Population: | 17,258 | | Population of Family homes: | 10,662 | | Population of 15 to 24 year olds: | 238 | | Population of 25 to 34 year olds: | 1,148 | | Population of 35 to 44 year olds: | 1,974 | | Population of 45 to 54 year olds: | 2,377 | | Population of 55 to 59 year olds: | 1,261 | | Population of 60 to 64 year olds: | 1,127 | | Population of 65 to 74 year olds: | 1,479 | | Population of 75 to 84 year olds: | 797 | | Population of 85 year olds and over: | 261 | | Population of Nonfamily Homes: | 6,596 | | Population of 15 to 24 year olds: | 283 | | Population of 25 to 34 year olds: | 607 | | Population of 35 to 44 year olds: | 534 | | Population of 45 to 54 year olds: | 1,147 | | Population of 55 to 59 year olds: | 718 | | Population of 60 to 64 year olds: | 732 | | Population of 65 to 74 year olds: | 1,107 | | Population of 75 to 84 year olds: | 906 | | Population of 85 year olds and over: | 562 |
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| households in Knox County containing people over 60 | | | Total Population: | 17,258 | | Population of homes with one or more people 60 years and over: | 7,493 | | 1-person household: | 2,991 | | 2-or-more-person household: | 4,502 | | Family households: | 4,116 | | Nonfamily households: | 386 | | Population of homes with no people 60 years and over: | 9,765 | | 1-person household: | 2,361 | | 2-or-more-person household: | 7,404 | | Family homes: | 6,546 | | Nonfamily homes: | 858 |
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| homes in Knox County with multiple generations. | | | Total Population: | 17,258 | | Home has three or more generations: | 344 | | Home does not have three or more generations: | 16,914 |
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| Unmarried population in Knox County under 18 years old in homes | | | Total Population: | 7,700 | | Unmarried partner of home lead present: | 966 | | In family homes: | 903 | | Population of male led and male partner homes: | 31 | | Population of male led and female partner households: | 436 | | Population of female led and female partner households: | 16 | | Population of female led and male partner households: | 420 | | In nonfamily homes: | 63 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 56 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 6 | | No unmarried partner of home lead present: | 6,734 | | In family homes: | 6,697 | | Population of husband-wife family homes: | 5,080 | | Population of male lead with no wife present, family homes: | 366 | | Population of female lead with no husband present, family homes: | 1,251 | | In nonfamily homes: | 37 |
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| Population in families living in Knox County | | | Total Population: | 29,314 | | Population Under 18 years: | 7,515 | | Population 18 years and over: | 21,799 |
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| How long in Knox County have lived in one place. | | | Total: | 17,258 | | Population of Owner occupied homes: | 12,789 | | Family home: | 8,794 | | Nonfamily homess: | 3,995 | | Male led home: | 1,683 | | Living alone: | 1,276 | | Not living alone: | 407 | | Female led home: | 2,312 | | Living alone: | 1,966 | | Not living alone: | 346 | | Population of Renter occupied homes: | 4,469 | | Family run homes: | 1,868 | | Husband-wife family: | 949 | | Other family: | 919 | | Male led with no wife present: | 245 | | Female led with no husband present: | 674 | | Nonfamily Homes: | 2,601 | | Male led homes: | 1,235 | | Male living alone: | 945 | | Male not living alone: | 290 | | Female led homes: | 1,366 | | Females living alone: | 1,165 | | Females not living alone: | 201 |
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