Population Demographics for Decatur County, Iowa in 2020, 2019
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| Total population in Decatur County | | | Total Population: | 8,457 | | Male Population: | 4,238 | | Female Population: | 4,219 |
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| Median age in Decatur County | | | Both sexes | 38 | | Male | 36 | | Female | 40 |
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| Population in households in Decatur County | | | Total Population: | 7,794 | | Male Population: | 3,908 | | Under 5 years: | 293 | | 5 to 9 years: | 260 | | 10 to 14 years: | 274 | | 15 to 17 years: | 193 | | 18 and 19 years: | 95 | | 20 years: | 59 | | 21 years: | 59 | | 22 to 24 years: | 171 | | 25 to 29 years: | 204 | | 30 to 34 years: | 185 | | 35 to 39 years: | 210 | | 40 to 44 years: | 205 | | 45 to 49 years: | 255 | | 50 to 54 years: | 282 | | 55 to 59 years: | 281 | | 60 and 61 years: | 103 | | 62 to 64 years: | 136 | | 65 and 66 years: | 77 | | 67 to 69 years: | 105 | | 70 to 74 years: | 164 | | 75 to 79 years: | 143 | | 80 to 84 years: | 94 | | 85 years and over: | 60 | | Female Population: | 3,886 | | Under 5 years: | 239 | | 5 to 9 years: | 250 | | 10 to 14 years: | 248 | | 15 to 17 years: | 160 | | 18 and 19 years: | 84 | | 20 years: | 50 | | 21 years: | 70 | | 22 to 24 years: | 128 | | 25 to 29 years: | 202 | | 30 to 34 years: | 189 | | 35 to 39 years: | 205 | | 40 to 44 years: | 204 | | 45 to 49 years: | 279 | | 50 to 54 years: | 276 | | 55 to 59 years: | 280 | | 60 and 61 years: | 93 | | 62 to 64 years: | 128 | | 65 and 66 years: | 88 | | 67 to 69 years: | 122 | | 70 to 74 years: | 181 | | 75 to 79 years: | 165 | | 80 to 84 years: | 126 | | 85 years and over: | 119 |
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| Average household size in Decatur County | | | Total: | 2 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Decatur County | | | Total: | 3,223 | | Family led homes: | 2,076 | | Husband-wife family: | 1,664 | | Other family: | 412 | | Population of male led with no wife present: | 135 | | Population female led with no husband present: | 277 | | Population of Nonfamily homes: | 1,147 | | Population living alone: | 939 | | Population not living alone: | 208 |
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| Total occupied homes in Decatur County with people under 18 years old: | | | Total: | 3,223 | | Population of homes with one or more people under 18 years: | 903 | | Population of family homes: | 890 | | Husband-wife family: | 604 | | Under 6 years only: | 120 | | Under 6 years and 6 to 17 years: | 155 | | 6 to 17 years only: | 329 | | Other family: | 286 | | Male householder, no wife present: | 88 | | Under 6 years only: | 24 | | Under 6 years and 6 to 17 years: | 18 | | 6 to 17 years only: | 46 | | Female led with no husband present: | 198 | | Under 6 years only: | 45 | | Under 6 years and 6 to 17 years: | 46 | | 6 to 17 years only: | 107 | | Nonfamily households: | 13 | | Male led households: | 12 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 6 | | Female led householder: | 1 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 1 | | Households with no people under 18 years: | 2,320 | | Family households: | 1,186 | | Husband-wife family: | 1,060 | | Other family: | 126 | | Male led with no wife present: | 47 | | Female led with no husband present: | 79 | | Nonfamily households: | 1,134 | | Male led householder: | 535 | | Female led householder: | 599 |
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| Total number led homes in Decatur County, by type | | | Total Home Population: | 3,223 | | Population of Family homes: | 2,076 | | Population of 15 to 24 year olds: | 66 | | Population of 25 to 34 year olds: | 287 | | Population of 35 to 44 year olds: | 357 | | Population of 45 to 54 year olds: | 431 | | Population of 55 to 59 year olds: | 216 | | Population of 60 to 64 year olds: | 194 | | Population of 65 to 74 year olds: | 296 | | Population of 75 to 84 year olds: | 190 | | Population of 85 year olds and over: | 39 | | Population of Nonfamily Homes: | 1,147 | | Population of 15 to 24 year olds: | 137 | | Population of 25 to 34 year olds: | 97 | | Population of 35 to 44 year olds: | 92 | | Population of 45 to 54 year olds: | 185 | | Population of 55 to 59 year olds: | 103 | | Population of 60 to 64 year olds: | 84 | | Population of 65 to 74 year olds: | 160 | | Population of 75 to 84 year olds: | 180 | | Population of 85 year olds and over: | 109 |
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| households in Decatur County containing people over 60 | | | Total Population: | 3,223 | | Population of homes with one or more people 60 years and over: | 1,330 | | 1-person household: | 506 | | 2-or-more-person household: | 824 | | Family households: | 791 | | Nonfamily households: | 33 | | Population of homes with no people 60 years and over: | 1,893 | | 1-person household: | 433 | | 2-or-more-person household: | 1,460 | | Family homes: | 1,285 | | Nonfamily homes: | 175 |
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| homes in Decatur County with multiple generations. | | | Total Population: | 3,223 | | Home has three or more generations: | 60 | | Home does not have three or more generations: | 3,163 |
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| Unmarried population in Decatur County under 18 years old in homes | | | Total Population: | 1,916 | | Unmarried partner of home lead present: | 199 | | In family homes: | 185 | | Population of male led and male partner homes: | 2 | | Population of male led and female partner households: | 80 | | Population of female led and female partner households: | 1 | | Population of female led and male partner households: | 102 | | In nonfamily homes: | 14 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 14 | | 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: | 1,717 | | In family homes: | 1,713 | | Population of husband-wife family homes: | 1,347 | | Population of male lead with no wife present, family homes: | 83 | | Population of female lead with no husband present, family homes: | 283 | | In nonfamily homes: | 4 |
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| Population in families living in Decatur County | | | Total Population: | 6,194 | | Population Under 18 years: | 1,879 | | Population 18 years and over: | 4,315 |
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| How long in Decatur County have lived in one place. | | | Total: | 3,223 | | Population of Owner occupied homes: | 2,271 | | Family home: | 1,677 | | Nonfamily homess: | 594 | | Male led home: | 277 | | Living alone: | 225 | | Not living alone: | 52 | | Female led home: | 317 | | Living alone: | 288 | | Not living alone: | 29 | | Population of Renter occupied homes: | 952 | | Family run homes: | 399 | | Husband-wife family: | 219 | | Other family: | 180 | | Male led with no wife present: | 55 | | Female led with no husband present: | 125 | | Nonfamily Homes: | 553 | | Male led homes: | 270 | | Male living alone: | 190 | | Male not living alone: | 80 | | Female led homes: | 283 | | Females living alone: | 236 | | Females not living alone: | 47 |
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