Population Demographics for Polk County, Missouri in 2020, 2019
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| Total population in Polk County | | Total Population: | 31,137 | Male Population: | 15,361 | Female Population: | 15,776 |
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| Median age in Polk County | | Both sexes | 37 | Male | 36 | Female | 39 |
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| Population in households in Polk County | | Total Population: | 29,626 | Male Population: | 14,611 | Under 5 years: | 1,034 | 5 to 9 years: | 1,037 | 10 to 14 years: | 1,111 | 15 to 17 years: | 706 | 18 and 19 years: | 424 | 20 years: | 153 | 21 years: | 228 | 22 to 24 years: | 610 | 25 to 29 years: | 850 | 30 to 34 years: | 768 | 35 to 39 years: | 853 | 40 to 44 years: | 863 | 45 to 49 years: | 1,157 | 50 to 54 years: | 988 | 55 to 59 years: | 846 | 60 and 61 years: | 357 | 62 to 64 years: | 468 | 65 and 66 years: | 292 | 67 to 69 years: | 446 | 70 to 74 years: | 508 | 75 to 79 years: | 422 | 80 to 84 years: | 280 | 85 years and over: | 210 | Female Population: | 15,015 | Under 5 years: | 961 | 5 to 9 years: | 1,020 | 10 to 14 years: | 1,031 | 15 to 17 years: | 638 | 18 and 19 years: | 321 | 20 years: | 191 | 21 years: | 237 | 22 to 24 years: | 540 | 25 to 29 years: | 851 | 30 to 34 years: | 811 | 35 to 39 years: | 926 | 40 to 44 years: | 874 | 45 to 49 years: | 1,123 | 50 to 54 years: | 1,070 | 55 to 59 years: | 939 | 60 and 61 years: | 352 | 62 to 64 years: | 530 | 65 and 66 years: | 327 | 67 to 69 years: | 415 | 70 to 74 years: | 611 | 75 to 79 years: | 549 | 80 to 84 years: | 362 | 85 years and over: | 336 |
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| Average household size in Polk County | | Total: | 2 | Under 18 years: | 0 | 18 years and over: | 1 |
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| Number of occupied homes in Polk County | | Total: | 11,677 | Family led homes: | 8,133 | Husband-wife family: | 6,521 | Other family: | 1,612 | Population of male led with no wife present: | 529 | Population female led with no husband present: | 1,083 | Population of Nonfamily homes: | 3,544 | Population living alone: | 2,887 | Population not living alone: | 657 |
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| Total occupied homes in Polk County with people under 18 years old: | | Total: | 11,677 | Population of homes with one or more people under 18 years: | 3,749 | Population of family homes: | 3,694 | Husband-wife family: | 2,594 | Under 6 years only: | 583 | Under 6 years and 6 to 17 years: | 580 | 6 to 17 years only: | 1,431 | Other family: | 1,100 | Male householder, no wife present: | 352 | Under 6 years only: | 90 | Under 6 years and 6 to 17 years: | 72 | 6 to 17 years only: | 190 | Female led with no husband present: | 748 | Under 6 years only: | 144 | Under 6 years and 6 to 17 years: | 147 | 6 to 17 years only: | 457 | Nonfamily households: | 55 | Male led households: | 45 | Under 6 years only: | 19 | Under 6 years and 6 to 17 years: | 5 | 6 to 17 years only: | 21 | Female led householder: | 10 | Under 6 years only: | 1 | Under 6 years and 6 to 17 years: | 3 | 6 to 17 years only: | 6 | Households with no people under 18 years: | 7,928 | Family households: | 4,439 | Husband-wife family: | 3,927 | Other family: | 512 | Male led with no wife present: | 177 | Female led with no husband present: | 335 | Nonfamily households: | 3,489 | Male led householder: | 1,569 | Female led householder: | 1,920 |
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| Total number led homes in Polk County, by type | | Total Home Population: | 11,677 | Population of Family homes: | 8,133 | Population of 15 to 24 year olds: | 344 | Population of 25 to 34 year olds: | 1,229 | Population of 35 to 44 year olds: | 1,552 | Population of 45 to 54 year olds: | 1,793 | Population of 55 to 59 year olds: | 703 | Population of 60 to 64 year olds: | 706 | Population of 65 to 74 year olds: | 1,062 | Population of 75 to 84 year olds: | 608 | Population of 85 year olds and over: | 136 | Population of Nonfamily Homes: | 3,544 | Population of 15 to 24 year olds: | 359 | Population of 25 to 34 year olds: | 310 | Population of 35 to 44 year olds: | 336 | Population of 45 to 54 year olds: | 552 | Population of 55 to 59 year olds: | 269 | Population of 60 to 64 year olds: | 318 | Population of 65 to 74 year olds: | 572 | Population of 75 to 84 year olds: | 537 | Population of 85 year olds and over: | 291 |
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| households in Polk County containing people over 60 | | Total Population: | 11,677 | Population of homes with one or more people 60 years and over: | 4,511 | 1-person household: | 1,611 | 2-or-more-person household: | 2,900 | Family households: | 2,779 | Nonfamily households: | 121 | Population of homes with no people 60 years and over: | 7,166 | 1-person household: | 1,276 | 2-or-more-person household: | 5,890 | Family homes: | 5,354 | Nonfamily homes: | 536 |
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| homes in Polk County with multiple generations. | | Total Population: | 11,677 | Home has three or more generations: | 359 | Home does not have three or more generations: | 11,318 |
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| Unmarried population in Polk County under 18 years old in homes | | Total Population: | 7,534 | Unmarried partner of home lead present: | 682 | In family homes: | 630 | Population of male led and male partner homes: | 20 | Population of male led and female partner households: | 316 | Population of female led and female partner households: | 6 | Population of female led and male partner households: | 288 | In nonfamily homes: | 52 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 52 | 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: | 6,852 | In family homes: | 6,828 | Population of husband-wife family homes: | 5,463 | Population of male lead with no wife present, family homes: | 309 | Population of female lead with no husband present, family homes: | 1,056 | In nonfamily homes: | 24 |
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| Population in families living in Polk County | | Total Population: | 24,499 | Population Under 18 years: | 7,323 | Population 18 years and over: | 17,176 |
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| How long in Polk County have lived in one place. | | Total: | 11,677 | Population of Owner occupied homes: | 8,275 | Family home: | 6,287 | Nonfamily homess: | 1,988 | Male led home: | 874 | Living alone: | 688 | Not living alone: | 186 | Female led home: | 1,114 | Living alone: | 994 | Not living alone: | 120 | Population of Renter occupied homes: | 3,402 | Family run homes: | 1,846 | Husband-wife family: | 1,105 | Other family: | 741 | Male led with no wife present: | 230 | Female led with no husband present: | 511 | Nonfamily Homes: | 1,556 | Male led homes: | 740 | Male living alone: | 531 | Male not living alone: | 209 | Female led homes: | 816 | Females living alone: | 674 | Females not living alone: | 142 |
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