Last official estimated population of Hardin County was 4,304 (year 2014)[1]. This was 0.001% of total US population and 0% of total Illinois state population. Area of Hardin County is 181.6 mi² (=470.3 km²), in this year population density was 23.70 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Hardin County population in 2026 would be 4,256 [0].
Historical population of Hardin 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] +7.68 %/yr
[1850-1860] +2.67 %/yr
[1860-1870] +3.12 %/yr
[1870-1880] +1.65 %/yr
[1880-1890] +1.85 %/yr
[1890-1900] +0.29 %/yr
[1900-1910] -0.6 %/yr
[1910-1920] +0.71 %/yr
[1920-1930] -0.8 %/yr
[1930-1940] +1.1 %/yr
[1940-1950] -0.3 %/yr
[1950-1960] -2.44 %/yr
[1960-1970] -1.78 %/yr
[1970-1980] +0.92 %/yr
[1980-1990] -0.37 %/yr
[1990-2000] -0.79 %/yr
[2000-2005] -0.75 %/yr
[2005-2010] -1.31 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Hardin County? Visit this page: Settlements in Hardin County, IL
Population of Hardin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 102 | 90 | 192 |
| 5 to 9 | 113 | 103 | 216 |
| 10 to 14 | 136 | 112 | 248 |
| 15 to 19 | 114 | 127 | 241 |
| 20 to 24 | 103 | 86 | 189 |
| 25 to 29 | 83 | 78 | 161 |
| 30 to 34 | 88 | 101 | 189 |
| 35 to 39 | 120 | 106 | 226 |
| 40 to 44 | 136 | 115 | 251 |
| 45 to 49 | 145 | 137 | 282 |
| 50 to 54 | 154 | 164 | 318 |
| 55 to 59 | 153 | 160 | 313 |
| 60 to 64 | 157 | 186 | 343 |
| 65 to 69 | 171 | 160 | 331 |
| 70 to 74 | 139 | 114 | 253 |
| 75 to 79 | 78 | 95 | 173 |
| 80 to 84 | 45 | 64 | 109 |
| 85+ | 54 | 40 | 94 |
Hardin 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 | 2063 | 1999 | 4,062 |
| WAC | 2043 | 1992 | 4,035 |
| WA | 2021 | 1972 | 3,993 |
| NHWAC | 2015 | 1955 | 3,970 |
| NHWA | 1995 | 1936 | 3,931 |
| H | 28 | 39 | 67 |
| HWAC | 28 | 37 | 65 |
| HWA | 26 | 36 | 62 |
| BAC | 24 | 24 | 48 |
| IAC | 22 | 25 | 47 |
| NHIAC | 22 | 23 | 45 |
| NHBAC | 22 | 23 | 45 |
| TOM | 22 | 20 | 42 |
| NHTOM | 20 | 19 | 39 |
| NHAAC | 22 | 14 | 36 |
| AAC | 22 | 14 | 36 |
| NHAA | 19 | 11 | 30 |
| AA | 19 | 11 | 30 |
| IA | 14 | 16 | 30 |
| NHIA | 14 | 15 | 29 |
| BA | 13 | 16 | 29 |
| NHBA | 13 | 15 | 28 |
| NHNAC | 2 | 4 | 6 |
| NAC | 2 | 4 | 6 |
| NA | 2 | 3 | 5 |
| NHNA | 2 | 3 | 5 |
| HTOM | 2 | 1 | 3 |
| HBAC | 2 | 1 | 3 |
| HIAC | 0 | 2 | 2 |
| HBA | 0 | 1 | 1 |
| HIA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Saline County population
22.2 mi, 
316°
• Massac County
31.9 mi, 
229°
• Union County
19.8 mi, 
60°
• Webster County
31.9 mi, 
89°
• Caldwell County
33.5 mi, 
139°
• Johnson County
34 mi, 
263°
• Livingston County
22 mi, 
194°
• Crittenden County
14.1 mi, 141°
• Gallatin County
17.5 mi, 
6°
• Pope County
16.7 mi, 
245°
[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
*Pope Illinois Notes
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