Last official estimated population of Grant County was 70,002 (year 2014)[1]. This was 0.022% of total US population and 1.1% of total Indiana state population. Area of Grant County is 414.9 mi² (=1074.6 km²), in this year population density was 168.72 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Grant County population in 2025 would be 69,840 [0].
Historical population of Grant County for period 1840-2014 [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

[1840-1850] +8.57 %/yr
[1850-1860] +3.6 %/yr
[1860-1870] +1.58 %/yr
[1870-1880] +2.48 %/yr
[1880-1890] +2.92 %/yr
[1890-1900] +5.67 %/yr
[1900-1910] -0.61 %/yr
[1910-1920] -0.01 %/yr
[1920-1930] -0.06 %/yr
[1930-1940] +0.89 %/yr
[1940-1950] +1.08 %/yr
[1950-1960] +2 %/yr
[1960-1970] +1.03 %/yr
[1970-1980] -0.37 %/yr
[1980-1990] -0.87 %/yr
[1990-2000] -0.1 %/yr
[2000-2005] -0.72 %/yr
[2005-2010] -0.21 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Grant County? Visit this page: Settlements in Grant County, IN
Population of Grant County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1899 | 1879 | 3,778 |
| 5 to 9 | 2013 | 1890 | 3,903 |
| 10 to 14 | 2057 | 1990 | 4,047 |
| 15 to 19 | 2543 | 2800 | 5,343 |
| 20 to 24 | 3011 | 3421 | 6,432 |
| 25 to 29 | 1720 | 1886 | 3,606 |
| 30 to 34 | 1651 | 1822 | 3,473 |
| 35 to 39 | 1712 | 1745 | 3,457 |
| 40 to 44 | 1981 | 1995 | 3,976 |
| 45 to 49 | 2024 | 2095 | 4,119 |
| 50 to 54 | 2401 | 2484 | 4,885 |
| 55 to 59 | 2413 | 2554 | 4,967 |
| 60 to 64 | 2107 | 2316 | 4,423 |
| 65 to 69 | 1806 | 1954 | 3,760 |
| 70 to 74 | 1303 | 1638 | 2,941 |
| 75 to 79 | 1019 | 1270 | 2,289 |
| 80 to 84 | 663 | 976 | 1,639 |
| 85+ | 465 | 1066 | 1,531 |
Grant 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 | 31315 | 34492 | 65,807 |
| WAC | 29844 | 32822 | 62,666 |
| WA | 29045 | 32060 | 61,105 |
| NHWAC | 28513 | 31639 | 60,152 |
| NHWA | 27767 | 30941 | 58,708 |
| BAC | 3079 | 2965 | 6,044 |
| NHBAC | 2956 | 2854 | 5,810 |
| BA | 2534 | 2450 | 4,984 |
| NHBA | 2438 | 2379 | 4,817 |
| H | 1473 | 1289 | 2,762 |
| HWAC | 1331 | 1183 | 2,514 |
| HWA | 1278 | 1119 | 2,397 |
| TOM | 827 | 791 | 1,618 |
| NHTOM | 773 | 725 | 1,498 |
| AAC | 347 | 466 | 813 |
| NHAAC | 335 | 446 | 781 |
| IAC | 315 | 309 | 624 |
| AA | 226 | 337 | 563 |
| NHAA | 217 | 325 | 542 |
| NHIAC | 266 | 271 | 537 |
| IA | 138 | 134 | 272 |
| HBAC | 123 | 111 | 234 |
| NHIA | 110 | 116 | 226 |
| HBA | 96 | 71 | 167 |
| HTOM | 54 | 66 | 120 |
| HIAC | 49 | 38 | 87 |
| NAC | 43 | 29 | 72 |
| NHNAC | 31 | 24 | 55 |
| HIA | 28 | 18 | 46 |
| HAAC | 12 | 20 | 32 |
| NA | 18 | 9 | 27 |
| HAA | 9 | 12 | 21 |
| HNAC | 12 | 5 | 17 |
| NHNA | 10 | 6 | 16 |
| HNA | 8 | 3 | 11 |
• Madison County population
24.4 mi,
188°
• Delaware County
24 mi,
145°
• Howard County
24.2 mi,
264°
• Huntington County
23.4 mi,
23°
• Miami County
27.1 mi,
311°
• Wabash County
23.8 mi,
342°
• Wells County
27.7 mi,
56°
• Jay County
34.7 mi,
99°
• Tipton County
25.4 mi,
236°
• Blackford County
17.7 mi,
99°
[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
See note 4 Indiana Notes
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