Population Demographics for Grundy County, Iowa in 2020, 2019
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| Total population in Grundy County | | | Total Population: | 12,453 | | Male Population: | 6,156 | | Female Population: | 6,297 |
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| Median age in Grundy County | | | Both sexes | 43 | | Male | 41 | | Female | 45 |
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| Population in households in Grundy County | | | Total Population: | 12,299 | | Male Population: | 6,117 | | Under 5 years: | 393 | | 5 to 9 years: | 417 | | 10 to 14 years: | 432 | | 15 to 17 years: | 298 | | 18 and 19 years: | 147 | | 20 years: | 57 | | 21 years: | 57 | | 22 to 24 years: | 163 | | 25 to 29 years: | 318 | | 30 to 34 years: | 329 | | 35 to 39 years: | 384 | | 40 to 44 years: | 364 | | 45 to 49 years: | 460 | | 50 to 54 years: | 478 | | 55 to 59 years: | 466 | | 60 and 61 years: | 165 | | 62 to 64 years: | 229 | | 65 and 66 years: | 116 | | 67 to 69 years: | 164 | | 70 to 74 years: | 252 | | 75 to 79 years: | 174 | | 80 to 84 years: | 141 | | 85 years and over: | 113 | | Female Population: | 6,182 | | Under 5 years: | 393 | | 5 to 9 years: | 374 | | 10 to 14 years: | 387 | | 15 to 17 years: | 271 | | 18 and 19 years: | 126 | | 20 years: | 50 | | 21 years: | 44 | | 22 to 24 years: | 162 | | 25 to 29 years: | 312 | | 30 to 34 years: | 328 | | 35 to 39 years: | 336 | | 40 to 44 years: | 383 | | 45 to 49 years: | 455 | | 50 to 54 years: | 510 | | 55 to 59 years: | 426 | | 60 and 61 years: | 149 | | 62 to 64 years: | 245 | | 65 and 66 years: | 117 | | 67 to 69 years: | 170 | | 70 to 74 years: | 279 | | 75 to 79 years: | 234 | | 80 to 84 years: | 219 | | 85 years and over: | 212 |
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| Average household size in Grundy County | | | Total: | 2 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Grundy County | | | Total: | 5,131 | | Family led homes: | 3,604 | | Husband-wife family: | 3,089 | | Other family: | 515 | | Population of male led with no wife present: | 191 | | Population female led with no husband present: | 324 | | Population of Nonfamily homes: | 1,527 | | Population living alone: | 1,325 | | Population not living alone: | 202 |
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| Total occupied homes in Grundy County with people under 18 years old: | | | Total: | 5,131 | | Population of homes with one or more people under 18 years: | 1,552 | | Population of family homes: | 1,537 | | Husband-wife family: | 1,181 | | Under 6 years only: | 290 | | Under 6 years and 6 to 17 years: | 235 | | 6 to 17 years only: | 656 | | Other family: | 356 | | Male householder, no wife present: | 131 | | Under 6 years only: | 34 | | Under 6 years and 6 to 17 years: | 13 | | 6 to 17 years only: | 84 | | Female led with no husband present: | 225 | | Under 6 years only: | 53 | | Under 6 years and 6 to 17 years: | 26 | | 6 to 17 years only: | 146 | | Nonfamily households: | 15 | | Male led households: | 12 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 5 | | Female led householder: | 3 | | Under 6 years only: | 1 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 3,579 | | Family households: | 2,067 | | Husband-wife family: | 1,908 | | Other family: | 159 | | Male led with no wife present: | 60 | | Female led with no husband present: | 99 | | Nonfamily households: | 1,512 | | Male led householder: | 696 | | Female led householder: | 816 |
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| Total number led homes in Grundy County, by type | | | Total Home Population: | 5,131 | | Population of Family homes: | 3,604 | | Population of 15 to 24 year olds: | 78 | | Population of 25 to 34 year olds: | 469 | | Population of 35 to 44 year olds: | 687 | | Population of 45 to 54 year olds: | 815 | | Population of 55 to 59 year olds: | 398 | | Population of 60 to 64 year olds: | 328 | | Population of 65 to 74 year olds: | 487 | | Population of 75 to 84 year olds: | 277 | | Population of 85 year olds and over: | 65 | | Population of Nonfamily Homes: | 1,527 | | Population of 15 to 24 year olds: | 89 | | Population of 25 to 34 year olds: | 162 | | Population of 35 to 44 year olds: | 142 | | Population of 45 to 54 year olds: | 220 | | Population of 55 to 59 year olds: | 127 | | Population of 60 to 64 year olds: | 126 | | Population of 65 to 74 year olds: | 179 | | Population of 75 to 84 year olds: | 272 | | Population of 85 year olds and over: | 210 |
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| households in Grundy County containing people over 60 | | | Total Population: | 5,131 | | Population of homes with one or more people 60 years and over: | 2,019 | | 1-person household: | 754 | | 2-or-more-person household: | 1,265 | | Family households: | 1,227 | | Nonfamily households: | 38 | | Population of homes with no people 60 years and over: | 3,112 | | 1-person household: | 571 | | 2-or-more-person household: | 2,541 | | Family homes: | 2,377 | | Nonfamily homes: | 164 |
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| homes in Grundy County with multiple generations. | | | Total Population: | 5,131 | | Home has three or more generations: | 64 | | Home does not have three or more generations: | 5,067 |
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| Unmarried population in Grundy County under 18 years old in homes | | | Total Population: | 2,963 | | Unmarried partner of home lead present: | 174 | | In family homes: | 153 | | Population of male led and male partner homes: | 6 | | Population of male led and female partner households: | 79 | | Population of female led and female partner households: | 15 | | Population of female led and male partner households: | 53 | | In nonfamily homes: | 21 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 19 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 2 | | No unmarried partner of home lead present: | 2,789 | | In family homes: | 2,785 | | Population of husband-wife family homes: | 2,333 | | Population of male lead with no wife present, family homes: | 139 | | Population of female lead with no husband present, family homes: | 313 | | In nonfamily homes: | 4 |
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| Population in families living in Grundy County | | | Total Population: | 10,356 | | Population Under 18 years: | 2,900 | | Population 18 years and over: | 7,456 |
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| How long in Grundy County have lived in one place. | | | Total: | 5,131 | | Population of Owner occupied homes: | 4,213 | | Family home: | 3,176 | | Nonfamily homess: | 1,037 | | Male led home: | 481 | | Living alone: | 384 | | Not living alone: | 97 | | Female led home: | 556 | | Living alone: | 512 | | Not living alone: | 44 | | Population of Renter occupied homes: | 918 | | Family run homes: | 428 | | Husband-wife family: | 257 | | Other family: | 171 | | Male led with no wife present: | 58 | | Female led with no husband present: | 113 | | Nonfamily Homes: | 490 | | Male led homes: | 227 | | Male living alone: | 196 | | Male not living alone: | 31 | | Female led homes: | 263 | | Females living alone: | 233 | | Females not living alone: | 30 |
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