Population Demographics for Mercer County, Illinois in 2020, 2019
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| Total population in Mercer County | | | Total Population: | 16,434 | | Male Population: | 8,125 | | Female Population: | 8,309 |
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| Median age in Mercer County | | | Both sexes | 43 | | Male | 42 | | Female | 44 |
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| Population in households in Mercer County | | | Total Population: | 16,249 | | Male Population: | 8,048 | | Under 5 years: | 462 | | 5 to 9 years: | 500 | | 10 to 14 years: | 605 | | 15 to 17 years: | 317 | | 18 and 19 years: | 204 | | 20 years: | 75 | | 21 years: | 68 | | 22 to 24 years: | 251 | | 25 to 29 years: | 394 | | 30 to 34 years: | 415 | | 35 to 39 years: | 478 | | 40 to 44 years: | 482 | | 45 to 49 years: | 653 | | 50 to 54 years: | 667 | | 55 to 59 years: | 633 | | 60 and 61 years: | 241 | | 62 to 64 years: | 313 | | 65 and 66 years: | 172 | | 67 to 69 years: | 285 | | 70 to 74 years: | 304 | | 75 to 79 years: | 249 | | 80 to 84 years: | 150 | | 85 years and over: | 130 | | Female Population: | 8,201 | | Under 5 years: | 502 | | 5 to 9 years: | 513 | | 10 to 14 years: | 512 | | 15 to 17 years: | 307 | | 18 and 19 years: | 182 | | 20 years: | 87 | | 21 years: | 67 | | 22 to 24 years: | 200 | | 25 to 29 years: | 374 | | 30 to 34 years: | 433 | | 35 to 39 years: | 457 | | 40 to 44 years: | 571 | | 45 to 49 years: | 670 | | 50 to 54 years: | 616 | | 55 to 59 years: | 602 | | 60 and 61 years: | 232 | | 62 to 64 years: | 303 | | 65 and 66 years: | 201 | | 67 to 69 years: | 280 | | 70 to 74 years: | 356 | | 75 to 79 years: | 282 | | 80 to 84 years: | 208 | | 85 years and over: | 246 |
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| Average household size in Mercer County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Mercer County | | | Total: | 6,734 | | Family led homes: | 4,724 | | Husband-wife family: | 3,924 | | Other family: | 800 | | Population of male led with no wife present: | 271 | | Population female led with no husband present: | 529 | | Population of Nonfamily homes: | 2,010 | | Population living alone: | 1,739 | | Population not living alone: | 271 |
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| Total occupied homes in Mercer County with people under 18 years old: | | | Total: | 6,734 | | Population of homes with one or more people under 18 years: | 2,029 | | Population of family homes: | 2,001 | | Husband-wife family: | 1,465 | | Under 6 years only: | 296 | | Under 6 years and 6 to 17 years: | 278 | | 6 to 17 years only: | 891 | | Other family: | 536 | | Male householder, no wife present: | 184 | | Under 6 years only: | 59 | | Under 6 years and 6 to 17 years: | 28 | | 6 to 17 years only: | 97 | | Female led with no husband present: | 352 | | Under 6 years only: | 85 | | Under 6 years and 6 to 17 years: | 55 | | 6 to 17 years only: | 212 | | Nonfamily households: | 28 | | Male led households: | 25 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 19 | | 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: | 4,705 | | Family households: | 2,723 | | Husband-wife family: | 2,459 | | Other family: | 264 | | Male led with no wife present: | 87 | | Female led with no husband present: | 177 | | Nonfamily households: | 1,982 | | Male led householder: | 969 | | Female led householder: | 1,013 |
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| Total number led homes in Mercer County, by type | | | Total Home Population: | 6,734 | | Population of Family homes: | 4,724 | | Population of 15 to 24 year olds: | 105 | | Population of 25 to 34 year olds: | 587 | | Population of 35 to 44 year olds: | 881 | | Population of 45 to 54 year olds: | 1,117 | | Population of 55 to 59 year olds: | 512 | | Population of 60 to 64 year olds: | 464 | | Population of 65 to 74 year olds: | 638 | | Population of 75 to 84 year olds: | 337 | | Population of 85 year olds and over: | 83 | | Population of Nonfamily Homes: | 2,010 | | Population of 15 to 24 year olds: | 105 | | Population of 25 to 34 year olds: | 181 | | Population of 35 to 44 year olds: | 125 | | Population of 45 to 54 year olds: | 335 | | Population of 55 to 59 year olds: | 193 | | Population of 60 to 64 year olds: | 173 | | Population of 65 to 74 year olds: | 361 | | Population of 75 to 84 year olds: | 298 | | Population of 85 year olds and over: | 239 |
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| households in Mercer County containing people over 60 | | | Total Population: | 6,734 | | Population of homes with one or more people 60 years and over: | 2,734 | | 1-person household: | 1,010 | | 2-or-more-person household: | 1,724 | | Family households: | 1,651 | | Nonfamily households: | 73 | | Population of homes with no people 60 years and over: | 4,000 | | 1-person household: | 729 | | 2-or-more-person household: | 3,271 | | Family homes: | 3,073 | | Nonfamily homes: | 198 |
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| homes in Mercer County with multiple generations. | | | Total Population: | 6,734 | | Home has three or more generations: | 169 | | Home does not have three or more generations: | 6,565 |
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| Unmarried population in Mercer County under 18 years old in homes | | | Total Population: | 3,715 | | Unmarried partner of home lead present: | 333 | | In family homes: | 305 | | Population of male led and male partner homes: | 5 | | Population of male led and female partner households: | 159 | | Population of female led and female partner households: | 3 | | Population of female led and male partner households: | 138 | | In nonfamily homes: | 28 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 27 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 3,382 | | In family homes: | 3,371 | | Population of husband-wife family homes: | 2,773 | | Population of male lead with no wife present, family homes: | 147 | | Population of female lead with no husband present, family homes: | 451 | | In nonfamily homes: | 11 |
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| Population in families living in Mercer County | | | Total Population: | 13,625 | | Population Under 18 years: | 3,650 | | Population 18 years and over: | 9,975 |
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| How long in Mercer County have lived in one place. | | | Total: | 6,734 | | Population of Owner occupied homes: | 5,420 | | Family home: | 4,075 | | Nonfamily homess: | 1,345 | | Male led home: | 664 | | Living alone: | 539 | | Not living alone: | 125 | | Female led home: | 681 | | Living alone: | 624 | | Not living alone: | 57 | | Population of Renter occupied homes: | 1,314 | | Family run homes: | 649 | | Husband-wife family: | 376 | | Other family: | 273 | | Male led with no wife present: | 87 | | Female led with no husband present: | 186 | | Nonfamily Homes: | 665 | | Male led homes: | 330 | | Male living alone: | 275 | | Male not living alone: | 55 | | Female led homes: | 335 | | Females living alone: | 301 | | Females not living alone: | 34 |
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