Population Demographics for Dekalb County, Tennessee in 2020, 2019
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| Total population in Dekalb County | | | Total Population: | 18,723 | | Male Population: | 9,270 | | Female Population: | 9,453 |
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| Median age in Dekalb County | | | Both sexes | 41 | | Male | 39 | | Female | 42 |
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| Population in households in Dekalb County | | | Total Population: | 18,425 | | Male Population: | 9,103 | | Under 5 years: | 606 | | 5 to 9 years: | 628 | | 10 to 14 years: | 608 | | 15 to 17 years: | 374 | | 18 and 19 years: | 211 | | 20 years: | 132 | | 21 years: | 100 | | 22 to 24 years: | 305 | | 25 to 29 years: | 478 | | 30 to 34 years: | 573 | | 35 to 39 years: | 582 | | 40 to 44 years: | 633 | | 45 to 49 years: | 743 | | 50 to 54 years: | 653 | | 55 to 59 years: | 633 | | 60 and 61 years: | 273 | | 62 to 64 years: | 333 | | 65 and 66 years: | 217 | | 67 to 69 years: | 251 | | 70 to 74 years: | 323 | | 75 to 79 years: | 213 | | 80 to 84 years: | 155 | | 85 years and over: | 79 | | Female Population: | 9,322 | | Under 5 years: | 544 | | 5 to 9 years: | 584 | | 10 to 14 years: | 589 | | 15 to 17 years: | 336 | | 18 and 19 years: | 205 | | 20 years: | 93 | | 21 years: | 77 | | 22 to 24 years: | 310 | | 25 to 29 years: | 533 | | 30 to 34 years: | 508 | | 35 to 39 years: | 593 | | 40 to 44 years: | 633 | | 45 to 49 years: | 729 | | 50 to 54 years: | 686 | | 55 to 59 years: | 668 | | 60 and 61 years: | 271 | | 62 to 64 years: | 373 | | 65 and 66 years: | 228 | | 67 to 69 years: | 290 | | 70 to 74 years: | 390 | | 75 to 79 years: | 275 | | 80 to 84 years: | 195 | | 85 years and over: | 212 |
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| Average household size in Dekalb County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Dekalb County | | | Total: | 7,420 | | Family led homes: | 5,140 | | Husband-wife family: | 3,834 | | Other family: | 1,306 | | Population of male led with no wife present: | 411 | | Population female led with no husband present: | 895 | | Population of Nonfamily homes: | 2,280 | | Population living alone: | 1,930 | | Population not living alone: | 350 |
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| Total occupied homes in Dekalb County with people under 18 years old: | | | Total: | 7,420 | | Population of homes with one or more people under 18 years: | 2,354 | | Population of family homes: | 2,313 | | Husband-wife family: | 1,506 | | Under 6 years only: | 333 | | Under 6 years and 6 to 17 years: | 355 | | 6 to 17 years only: | 818 | | Other family: | 807 | | Male householder, no wife present: | 241 | | Under 6 years only: | 69 | | Under 6 years and 6 to 17 years: | 34 | | 6 to 17 years only: | 138 | | Female led with no husband present: | 566 | | Under 6 years only: | 142 | | Under 6 years and 6 to 17 years: | 97 | | 6 to 17 years only: | 327 | | Nonfamily households: | 41 | | Male led households: | 32 | | Under 6 years only: | 9 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 20 | | Female led householder: | 9 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 7 | | Households with no people under 18 years: | 5,066 | | Family households: | 2,827 | | Husband-wife family: | 2,328 | | Other family: | 499 | | Male led with no wife present: | 170 | | Female led with no husband present: | 329 | | Nonfamily households: | 2,239 | | Male led householder: | 1,031 | | Female led householder: | 1,208 |
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| Total number led homes in Dekalb County, by type | | | Total Home Population: | 7,420 | | Population of Family homes: | 5,140 | | Population of 15 to 24 year olds: | 195 | | Population of 25 to 34 year olds: | 743 | | Population of 35 to 44 year olds: | 995 | | Population of 45 to 54 year olds: | 1,089 | | Population of 55 to 59 year olds: | 524 | | Population of 60 to 64 year olds: | 518 | | Population of 65 to 74 year olds: | 719 | | Population of 75 to 84 year olds: | 298 | | Population of 85 year olds and over: | 59 | | Population of Nonfamily Homes: | 2,280 | | Population of 15 to 24 year olds: | 93 | | Population of 25 to 34 year olds: | 152 | | Population of 35 to 44 year olds: | 231 | | Population of 45 to 54 year olds: | 464 | | Population of 55 to 59 year olds: | 191 | | Population of 60 to 64 year olds: | 250 | | Population of 65 to 74 year olds: | 417 | | Population of 75 to 84 year olds: | 309 | | Population of 85 year olds and over: | 173 |
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| households in Dekalb County containing people over 60 | | | Total Population: | 7,420 | | Population of homes with one or more people 60 years and over: | 2,965 | | 1-person household: | 1,086 | | 2-or-more-person household: | 1,879 | | Family households: | 1,810 | | Nonfamily households: | 69 | | Population of homes with no people 60 years and over: | 4,455 | | 1-person household: | 844 | | 2-or-more-person household: | 3,611 | | Family homes: | 3,330 | | Nonfamily homes: | 281 |
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| homes in Dekalb County with multiple generations. | | | Total Population: | 7,420 | | Home has three or more generations: | 359 | | Home does not have three or more generations: | 7,061 |
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| Unmarried population in Dekalb County under 18 years old in homes | | | Total Population: | 4,262 | | Unmarried partner of home lead present: | 384 | | In family homes: | 341 | | Population of male led and male partner homes: | 7 | | Population of male led and female partner households: | 152 | | Population of female led and female partner households: | 8 | | Population of female led and male partner households: | 174 | | In nonfamily homes: | 43 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 42 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 1 | | No unmarried partner of home lead present: | 3,878 | | In family homes: | 3,859 | | Population of husband-wife family homes: | 2,834 | | Population of male lead with no wife present, family homes: | 235 | | Population of female lead with no husband present, family homes: | 790 | | In nonfamily homes: | 19 |
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| Population in families living in Dekalb County | | | Total Population: | 15,182 | | Population Under 18 years: | 4,138 | | Population 18 years and over: | 11,044 |
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| How long in Dekalb County have lived in one place. | | | Total: | 7,420 | | Population of Owner occupied homes: | 5,311 | | Family home: | 3,895 | | Nonfamily homess: | 1,416 | | Male led home: | 618 | | Living alone: | 521 | | Not living alone: | 97 | | Female led home: | 798 | | Living alone: | 722 | | Not living alone: | 76 | | Population of Renter occupied homes: | 2,109 | | Family run homes: | 1,245 | | Husband-wife family: | 658 | | Other family: | 587 | | Male led with no wife present: | 173 | | Female led with no husband present: | 414 | | Nonfamily Homes: | 864 | | Male led homes: | 445 | | Male living alone: | 337 | | Male not living alone: | 108 | | Female led homes: | 419 | | Females living alone: | 350 | | Females not living alone: | 69 |
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