Last official estimated population of Grundy County was 10,260 (year 2014)[1]. This was 0.003% of total US population and 0.2% of total Missouri state population. Area of Grundy County is 438.0 mi² (=1134.5 km²), in this year population density was 23.42 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), Grundy County population in 2024 would be 10,258 [0].
Historical population of Grundy County for period 1850-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1850-1860] +10.13 %/yr
[1860-1870] +2.97 %/yr
[1870-1880] +3.69 %/yr
[1880-1890] +1.64 %/yr
[1890-1900] -0.02 %/yr
[1900-1910] -0.63 %/yr
[1910-1920] +0.47 %/yr
[1920-1930] -0.84 %/yr
[1930-1940] -0.26 %/yr
[1940-1950] -1.71 %/yr
[1950-1960] -0.78 %/yr
[1960-1970] -0.33 %/yr
[1970-1980] +0.12 %/yr
[1980-1990] -1.26 %/yr
[1990-2000] -0.11 %/yr
[2000-2005] -0.27 %/yr
[2005-2010] -0.04 %/yr
[2010-2014] -0 %/yr
Looking for settlements in Grundy County? Visit this page: Settlements in Grundy County, MO
Population of Grundy County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 344 | 350 | 694 |
| 5 to 9 | 337 | 353 | 690 |
| 10 to 14 | 296 | 349 | 645 |
| 15 to 19 | 309 | 347 | 656 |
| 20 to 24 | 325 | 324 | 649 |
| 25 to 29 | 297 | 295 | 592 |
| 30 to 34 | 294 | 277 | 571 |
| 35 to 39 | 216 | 237 | 453 |
| 40 to 44 | 232 | 267 | 499 |
| 45 to 49 | 286 | 310 | 596 |
| 50 to 54 | 337 | 356 | 693 |
| 55 to 59 | 352 | 329 | 681 |
| 60 to 64 | 304 | 314 | 618 |
| 65 to 69 | 263 | 303 | 566 |
| 70 to 74 | 237 | 294 | 531 |
| 75 to 79 | 191 | 234 | 425 |
| 80 to 84 | 110 | 173 | 283 |
| 85+ | 102 | 253 | 355 |
Grundy County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 4730 | 5262 | 9,992 |
| WAC | 4729 | 5244 | 9,973 |
| WA | 4686 | 5182 | 9,868 |
| NHWAC | 4633 | 5150 | 9,783 |
| NHWA | 4593 | 5092 | 9,685 |
| H | 102 | 103 | 205 |
| HWAC | 96 | 94 | 190 |
| HWA | 93 | 90 | 183 |
| IAC | 61 | 63 | 124 |
| BAC | 65 | 57 | 122 |
| NHBAC | 63 | 55 | 118 |
| TOM | 46 | 70 | 116 |
| NHIAC | 56 | 59 | 115 |
| NHTOM | 43 | 66 | 109 |
| AAC | 20 | 67 | 87 |
| BA | 48 | 35 | 83 |
| NHBA | 47 | 34 | 81 |
| NHAAC | 19 | 61 | 80 |
| AA | 14 | 53 | 67 |
| NHAA | 13 | 48 | 61 |
| IA | 36 | 21 | 57 |
| NHIA | 32 | 19 | 51 |
| NAC | 5 | 5 | 10 |
| HIAC | 5 | 4 | 9 |
| NHNAC | 4 | 4 | 8 |
| HTOM | 3 | 4 | 7 |
| HAAC | 1 | 6 | 7 |
| HIA | 4 | 2 | 6 |
| NA | 2 | 4 | 6 |
| HAA | 1 | 5 | 6 |
| NHNA | 2 | 3 | 5 |
| HBAC | 2 | 2 | 4 |
| HNAC | 1 | 1 | 2 |
| HBA | 1 | 1 | 2 |
| HNA | 0 | 1 | 1 |
• Livingston County population
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• Sullivan County
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• Putnam County
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• Mercer County
21.3 mi, 
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[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Livingston Missouri Notes
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