Population Demographics for Columbia County, Oregon in 2020, 2019
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| Total population in Columbia County | | | Total Population: | 49,351 | | Male Population: | 24,722 | | Female Population: | 24,629 |
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| Median age in Columbia County | | | Both sexes | 41 | | Male | 40 | | Female | 41 |
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| Population in households in Columbia County | | | Total Population: | 48,852 | | Male Population: | 24,440 | | Under 5 years: | 1,447 | | 5 to 9 years: | 1,590 | | 10 to 14 years: | 1,884 | | 15 to 17 years: | 1,119 | | 18 and 19 years: | 637 | | 20 years: | 271 | | 21 years: | 242 | | 22 to 24 years: | 667 | | 25 to 29 years: | 1,149 | | 30 to 34 years: | 1,406 | | 35 to 39 years: | 1,492 | | 40 to 44 years: | 1,733 | | 45 to 49 years: | 1,871 | | 50 to 54 years: | 2,036 | | 55 to 59 years: | 1,989 | | 60 and 61 years: | 707 | | 62 to 64 years: | 976 | | 65 and 66 years: | 537 | | 67 to 69 years: | 744 | | 70 to 74 years: | 782 | | 75 to 79 years: | 552 | | 80 to 84 years: | 338 | | 85 years and over: | 271 | | Female Population: | 24,412 | | Under 5 years: | 1,348 | | 5 to 9 years: | 1,534 | | 10 to 14 years: | 1,685 | | 15 to 17 years: | 998 | | 18 and 19 years: | 570 | | 20 years: | 239 | | 21 years: | 242 | | 22 to 24 years: | 669 | | 25 to 29 years: | 1,214 | | 30 to 34 years: | 1,502 | | 35 to 39 years: | 1,554 | | 40 to 44 years: | 1,744 | | 45 to 49 years: | 1,868 | | 50 to 54 years: | 2,055 | | 55 to 59 years: | 1,935 | | 60 and 61 years: | 713 | | 62 to 64 years: | 1,026 | | 65 and 66 years: | 504 | | 67 to 69 years: | 685 | | 70 to 74 years: | 777 | | 75 to 79 years: | 604 | | 80 to 84 years: | 460 | | 85 years and over: | 486 |
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| Average household size in Columbia County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Columbia County | | | Total: | 19,183 | | Family led homes: | 13,516 | | Husband-wife family: | 10,649 | | Other family: | 2,867 | | Population of male led with no wife present: | 986 | | Population female led with no husband present: | 1,881 | | Population of Nonfamily homes: | 5,667 | | Population living alone: | 4,474 | | Population not living alone: | 1,193 |
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| Total occupied homes in Columbia County with people under 18 years old: | | | Total: | 19,183 | | Population of homes with one or more people under 18 years: | 6,143 | | Population of family homes: | 6,038 | | Husband-wife family: | 4,146 | | Under 6 years only: | 878 | | Under 6 years and 6 to 17 years: | 843 | | 6 to 17 years only: | 2,425 | | Other family: | 1,892 | | Male householder, no wife present: | 611 | | Under 6 years only: | 150 | | Under 6 years and 6 to 17 years: | 92 | | 6 to 17 years only: | 369 | | Female led with no husband present: | 1,281 | | Under 6 years only: | 257 | | Under 6 years and 6 to 17 years: | 231 | | 6 to 17 years only: | 793 | | Nonfamily households: | 105 | | Male led households: | 82 | | Under 6 years only: | 17 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 62 | | Female led householder: | 23 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 17 | | Households with no people under 18 years: | 13,040 | | Family households: | 7,478 | | Husband-wife family: | 6,503 | | Other family: | 975 | | Male led with no wife present: | 375 | | Female led with no husband present: | 600 | | Nonfamily households: | 5,562 | | Male led householder: | 2,836 | | Female led householder: | 2,726 |
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| Total number led homes in Columbia County, by type | | | Total Home Population: | 19,183 | | Population of Family homes: | 13,516 | | Population of 15 to 24 year olds: | 305 | | Population of 25 to 34 year olds: | 1,765 | | Population of 35 to 44 year olds: | 2,848 | | Population of 45 to 54 year olds: | 3,154 | | Population of 55 to 59 year olds: | 1,539 | | Population of 60 to 64 year olds: | 1,349 | | Population of 65 to 74 year olds: | 1,653 | | Population of 75 to 84 year olds: | 714 | | Population of 85 year olds and over: | 189 | | Population of Nonfamily Homes: | 5,667 | | Population of 15 to 24 year olds: | 213 | | Population of 25 to 34 year olds: | 481 | | Population of 35 to 44 year olds: | 575 | | Population of 45 to 54 year olds: | 1,161 | | Population of 55 to 59 year olds: | 727 | | Population of 60 to 64 year olds: | 624 | | Population of 65 to 74 year olds: | 881 | | Population of 75 to 84 year olds: | 619 | | Population of 85 year olds and over: | 386 |
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| households in Columbia County containing people over 60 | | | Total Population: | 19,183 | | Population of homes with one or more people 60 years and over: | 7,107 | | 1-person household: | 2,257 | | 2-or-more-person household: | 4,850 | | Family households: | 4,551 | | Nonfamily households: | 299 | | Population of homes with no people 60 years and over: | 12,076 | | 1-person household: | 2,217 | | 2-or-more-person household: | 9,859 | | Family homes: | 8,965 | | Nonfamily homes: | 894 |
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| homes in Columbia County with multiple generations. | | | Total Population: | 19,183 | | Home has three or more generations: | 656 | | Home does not have three or more generations: | 18,527 |
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| Unmarried population in Columbia County under 18 years old in homes | | | Total Population: | 11,599 | | Unmarried partner of home lead present: | 1,119 | | In family homes: | 1,009 | | Population of male led and male partner homes: | 16 | | Population of male led and female partner households: | 506 | | Population of female led and female partner households: | 38 | | Population of female led and male partner households: | 449 | | In nonfamily homes: | 110 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 94 | | Population of female led and female partner homes: | 6 | | Population of female led and male partner homes: | 10 | | No unmarried partner of home lead present: | 10,480 | | In family homes: | 10,442 | | Population of husband-wife family homes: | 8,214 | | Population of male lead with no wife present, family homes: | 495 | | Population of female lead with no husband present, family homes: | 1,733 | | In nonfamily homes: | 38 |
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| Population in families living in Columbia County | | | Total Population: | 40,236 | | Population Under 18 years: | 11,251 | | Population 18 years and over: | 28,985 |
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| How long in Columbia County have lived in one place. | | | Total: | 19,183 | | Population of Owner occupied homes: | 14,282 | | Family home: | 10,827 | | Nonfamily homess: | 3,455 | | Male led home: | 1,816 | | Living alone: | 1,373 | | Not living alone: | 443 | | Female led home: | 1,639 | | Living alone: | 1,350 | | Not living alone: | 289 | | Population of Renter occupied homes: | 4,901 | | Family run homes: | 2,689 | | Husband-wife family: | 1,351 | | Other family: | 1,338 | | Male led with no wife present: | 423 | | Female led with no husband present: | 915 | | Nonfamily Homes: | 2,212 | | Male led homes: | 1,102 | | Male living alone: | 830 | | Male not living alone: | 272 | | Female led homes: | 1,110 | | Females living alone: | 921 | | Females not living alone: | 189 |
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