Population Demographics for O'brien County, Iowa in 2020, 2019
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| Total population in O'brien County | | | Total Population: | 14,398 | | Male Population: | 7,166 | | Female Population: | 7,232 |
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| Median age in O'brien County | | | Both sexes | 44 | | Male | 41 | | Female | 47 |
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| Population in households in O'brien County | | | Total Population: | 14,032 | | Male Population: | 6,988 | | Under 5 years: | 473 | | 5 to 9 years: | 518 | | 10 to 14 years: | 499 | | 15 to 17 years: | 313 | | 18 and 19 years: | 168 | | 20 years: | 77 | | 21 years: | 51 | | 22 to 24 years: | 206 | | 25 to 29 years: | 408 | | 30 to 34 years: | 404 | | 35 to 39 years: | 350 | | 40 to 44 years: | 391 | | 45 to 49 years: | 475 | | 50 to 54 years: | 585 | | 55 to 59 years: | 530 | | 60 and 61 years: | 170 | | 62 to 64 years: | 207 | | 65 and 66 years: | 127 | | 67 to 69 years: | 167 | | 70 to 74 years: | 250 | | 75 to 79 years: | 253 | | 80 to 84 years: | 215 | | 85 years and over: | 151 | | Female Population: | 7,044 | | Under 5 years: | 449 | | 5 to 9 years: | 419 | | 10 to 14 years: | 449 | | 15 to 17 years: | 272 | | 18 and 19 years: | 132 | | 20 years: | 50 | | 21 years: | 72 | | 22 to 24 years: | 183 | | 25 to 29 years: | 370 | | 30 to 34 years: | 367 | | 35 to 39 years: | 324 | | 40 to 44 years: | 371 | | 45 to 49 years: | 515 | | 50 to 54 years: | 548 | | 55 to 59 years: | 525 | | 60 and 61 years: | 153 | | 62 to 64 years: | 244 | | 65 and 66 years: | 126 | | 67 to 69 years: | 187 | | 70 to 74 years: | 297 | | 75 to 79 years: | 357 | | 80 to 84 years: | 308 | | 85 years and over: | 326 |
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| Average household size in O'brien County | | | Total: | 2 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in O'brien County | | | Total: | 6,069 | | Family led homes: | 3,927 | | Husband-wife family: | 3,342 | | Other family: | 585 | | Population of male led with no wife present: | 214 | | Population female led with no husband present: | 371 | | Population of Nonfamily homes: | 2,142 | | Population living alone: | 1,909 | | Population not living alone: | 233 |
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| Total occupied homes in O'brien County with people under 18 years old: | | | Total: | 6,069 | | Population of homes with one or more people under 18 years: | 1,671 | | Population of family homes: | 1,654 | | Husband-wife family: | 1,227 | | Under 6 years only: | 243 | | Under 6 years and 6 to 17 years: | 308 | | 6 to 17 years only: | 676 | | Other family: | 427 | | Male householder, no wife present: | 151 | | Under 6 years only: | 62 | | Under 6 years and 6 to 17 years: | 26 | | 6 to 17 years only: | 63 | | Female led with no husband present: | 276 | | Under 6 years only: | 64 | | Under 6 years and 6 to 17 years: | 58 | | 6 to 17 years only: | 154 | | Nonfamily households: | 17 | | Male led households: | 14 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 4 | | 6 to 17 years only: | 6 | | Female led householder: | 3 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 3 | | Households with no people under 18 years: | 4,398 | | Family households: | 2,273 | | Husband-wife family: | 2,115 | | Other family: | 158 | | Male led with no wife present: | 63 | | Female led with no husband present: | 95 | | Nonfamily households: | 2,125 | | Male led householder: | 959 | | Female led householder: | 1,166 |
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| Total number led homes in O'brien County, by type | | | Total Home Population: | 6,069 | | Population of Family homes: | 3,927 | | Population of 15 to 24 year olds: | 108 | | Population of 25 to 34 year olds: | 591 | | Population of 35 to 44 year olds: | 643 | | Population of 45 to 54 year olds: | 889 | | Population of 55 to 59 year olds: | 436 | | Population of 60 to 64 year olds: | 326 | | Population of 65 to 74 year olds: | 439 | | Population of 75 to 84 year olds: | 392 | | Population of 85 year olds and over: | 103 | | Population of Nonfamily Homes: | 2,142 | | Population of 15 to 24 year olds: | 146 | | Population of 25 to 34 year olds: | 228 | | Population of 35 to 44 year olds: | 156 | | Population of 45 to 54 year olds: | 279 | | Population of 55 to 59 year olds: | 172 | | Population of 60 to 64 year olds: | 136 | | Population of 65 to 74 year olds: | 315 | | Population of 75 to 84 year olds: | 403 | | Population of 85 year olds and over: | 307 |
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| households in O'brien County containing people over 60 | | | Total Population: | 6,069 | | Population of homes with one or more people 60 years and over: | 2,496 | | 1-person household: | 1,128 | | 2-or-more-person household: | 1,368 | | Family households: | 1,330 | | Nonfamily households: | 38 | | Population of homes with no people 60 years and over: | 3,573 | | 1-person household: | 781 | | 2-or-more-person household: | 2,792 | | Family homes: | 2,597 | | Nonfamily homes: | 195 |
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| homes in O'brien County with multiple generations. | | | Total Population: | 6,069 | | Home has three or more generations: | 76 | | Home does not have three or more generations: | 5,993 |
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| Unmarried population in O'brien County under 18 years old in homes | | | Total Population: | 3,390 | | Unmarried partner of home lead present: | 264 | | In family homes: | 238 | | Population of male led and male partner homes: | 4 | | Population of male led and female partner households: | 140 | | Population of female led and female partner households: | 0 | | Population of female led and male partner households: | 94 | | In nonfamily homes: | 26 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 24 | | 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: | 3,126 | | In family homes: | 3,120 | | Population of husband-wife family homes: | 2,591 | | Population of male lead with no wife present, family homes: | 121 | | Population of female lead with no husband present, family homes: | 408 | | In nonfamily homes: | 6 |
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| Population in families living in O'brien County | | | Total Population: | 11,362 | | Population Under 18 years: | 3,314 | | Population 18 years and over: | 8,048 |
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| How long in O'brien County have lived in one place. | | | Total: | 6,069 | | Population of Owner occupied homes: | 4,594 | | Family home: | 3,310 | | Nonfamily homess: | 1,284 | | Male led home: | 532 | | Living alone: | 465 | | Not living alone: | 67 | | Female led home: | 752 | | Living alone: | 715 | | Not living alone: | 37 | | Population of Renter occupied homes: | 1,475 | | Family run homes: | 617 | | Husband-wife family: | 364 | | Other family: | 253 | | Male led with no wife present: | 84 | | Female led with no husband present: | 169 | | Nonfamily Homes: | 858 | | Male led homes: | 441 | | Male living alone: | 355 | | Male not living alone: | 86 | | Female led homes: | 417 | | Females living alone: | 374 | | Females not living alone: | 43 |
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