Last official estimated population of Grundy County was 12,447 (year 2014)[1]. This was 0.004% of total US population and 0.4% of total Iowa state population. Area of Grundy County is 501.9 mi² (=1299.9 km²), in this year population density was 24.80 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Grundy County population in 2025 would be 12,431 [0].
Historical population of Grundy County for period 1860-2014 [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
[1860-1870] +23.22 %/yr
[1870-1880] +7.04 %/yr
[1880-1890] +0.45 %/yr
[1890-1900] +0.4 %/yr
[1900-1910] -0.13 %/yr
[1910-1920] +0.61 %/yr
[1920-1930] -0.2 %/yr
[1930-1940] -0.44 %/yr
[1940-1950] +0.15 %/yr
[1950-1960] +0.29 %/yr
[1960-1970] -0.01 %/yr
[1970-1980] +0.17 %/yr
[1980-1990] -1.76 %/yr
[1990-2000] +0.28 %/yr
[2000-2005] +0.06 %/yr
[2005-2010] +0.08 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Grundy County? Visit this page: Settlements in Grundy County, IA
Population of Grundy County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 339 | 405 | 744 |
| 5 to 9 | 418 | 408 | 826 |
| 10 to 14 | 415 | 401 | 816 |
| 15 to 19 | 398 | 369 | 767 |
| 20 to 24 | 345 | 313 | 658 |
| 25 to 29 | 274 | 280 | 554 |
| 30 to 34 | 370 | 357 | 727 |
| 35 to 39 | 362 | 348 | 710 |
| 40 to 44 | 377 | 327 | 704 |
| 45 to 49 | 370 | 370 | 740 |
| 50 to 54 | 463 | 479 | 942 |
| 55 to 59 | 453 | 469 | 922 |
| 60 to 64 | 419 | 395 | 814 |
| 65 to 69 | 330 | 366 | 696 |
| 70 to 74 | 251 | 270 | 521 |
| 75 to 79 | 214 | 244 | 458 |
| 80 to 84 | 136 | 208 | 344 |
| 85+ | 140 | 292 | 432 |
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 |
| WAC | 6012 | 6247 | 12,259 |
| NH | 5990 | 6231 | 12,221 |
| WA | 5963 | 6198 | 12,161 |
| NHWAC | 5933 | 6182 | 12,115 |
| NHWA | 5886 | 6135 | 12,021 |
| H | 84 | 70 | 154 |
| HWAC | 79 | 65 | 144 |
| HWA | 77 | 63 | 140 |
| BAC | 59 | 48 | 107 |
| NHBAC | 56 | 44 | 100 |
| TOM | 49 | 51 | 100 |
| NHTOM | 47 | 49 | 96 |
| AAC | 26 | 32 | 58 |
| BA | 37 | 19 | 56 |
| NHAAC | 24 | 30 | 54 |
| NHBA | 34 | 15 | 49 |
| AA | 17 | 26 | 43 |
| IAC | 21 | 21 | 42 |
| NHAA | 16 | 25 | 41 |
| NHIAC | 20 | 20 | 40 |
| NAC | 5 | 6 | 11 |
| NHNAC | 4 | 6 | 10 |
| NA | 4 | 4 | 8 |
| NHIA | 4 | 3 | 7 |
| IA | 4 | 3 | 7 |
| NHNA | 3 | 4 | 7 |
| HBAC | 3 | 4 | 7 |
| HBA | 3 | 4 | 7 |
| HTOM | 2 | 2 | 4 |
| HAAC | 2 | 2 | 4 |
| HIAC | 1 | 1 | 2 |
| HAA | 1 | 1 | 2 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| HIA | 0 | 0 | 0 |
• Black Hawk County population
25 mi, 
79°
• Story County
42.8 mi, 
233°
• Marshall County
26.8 mi, 
201°
• Benton County
43.2 mi, 
119°
• Bremer County
35.1 mi, 
42°
• Tama County
26.3 mi, 
149°
• Hardin County
23 mi, 
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• Floyd County
44.9 mi, 
0°
• Butler County
22.9 mi, 1°
• Franklin County
33.6 mi, 
313°
[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
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