Last official estimated population of Gallatin County was 5,578 (year 2014)[1]. This was 0.002% of total US population and 0% of total Illinois state population. Area of Gallatin County is 328.2 mi² (=850 km²), in this year population density was 17.00 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Gallatin County population in 2024 would be 5,551 [0].
Historical population of Gallatin County for period 1820-2014 [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
[1820-1830] +8.91 %/yr
[1830-1840] +3.81 %/yr
[1840-1850] -6.58 %/yr
[1850-1860] +3.99 %/yr
[1860-1870] +3.29 %/yr
[1870-1880] +1.45 %/yr
[1880-1890] +1.51 %/yr
[1890-1900] +0.59 %/yr
[1900-1910] -0.79 %/yr
[1910-1920] -1.28 %/yr
[1920-1930] -2.39 %/yr
[1930-1940] +1.24 %/yr
[1940-1950] -1.49 %/yr
[1950-1960] -2.48 %/yr
[1960-1970] -0.29 %/yr
[1970-1980] +0.23 %/yr
[1980-1990] -0.94 %/yr
[1990-2000] -0.72 %/yr
[2000-2005] -1.26 %/yr
[2005-2010] -1.51 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Gallatin County? Visit this page: Settlements in Gallatin County, IL
Population of Gallatin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 119 | 122 | 241 |
| 5 to 9 | 156 | 157 | 313 |
| 10 to 14 | 166 | 163 | 329 |
| 15 to 19 | 135 | 137 | 272 |
| 20 to 24 | 144 | 138 | 282 |
| 25 to 29 | 125 | 122 | 247 |
| 30 to 34 | 157 | 158 | 315 |
| 35 to 39 | 152 | 155 | 307 |
| 40 to 44 | 165 | 172 | 337 |
| 45 to 49 | 156 | 166 | 322 |
| 50 to 54 | 197 | 192 | 389 |
| 55 to 59 | 181 | 186 | 367 |
| 60 to 64 | 157 | 208 | 365 |
| 65 to 69 | 193 | 200 | 393 |
| 70 to 74 | 161 | 160 | 321 |
| 75 to 79 | 101 | 131 | 232 |
| 80 to 84 | 67 | 86 | 153 |
| 85+ | 34 | 72 | 106 |
Gallatin 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 | 2528 | 2697 | 5,225 |
| NH | 2511 | 2680 | 5,191 |
| WA | 2496 | 2651 | 5,147 |
| NHWAC | 2475 | 2653 | 5,128 |
| NHWA | 2443 | 2607 | 5,050 |
| H | 55 | 45 | 100 |
| HWA | 53 | 44 | 97 |
| HWAC | 53 | 44 | 97 |
| TOM | 33 | 48 | 81 |
| NHTOM | 33 | 48 | 81 |
| BAC | 36 | 40 | 76 |
| NHBAC | 34 | 39 | 73 |
| NHIAC | 20 | 27 | 47 |
| IAC | 20 | 27 | 47 |
| BA | 25 | 15 | 40 |
| NHBA | 23 | 14 | 37 |
| AAC | 15 | 10 | 25 |
| NHAAC | 15 | 10 | 25 |
| IA | 9 | 8 | 17 |
| NHIA | 9 | 8 | 17 |
| AA | 3 | 3 | 6 |
| NHAA | 3 | 3 | 6 |
| HBAC | 2 | 1 | 3 |
| HBA | 2 | 1 | 3 |
| NAC | 1 | 0 | 1 |
| NHNAC | 1 | 0 | 1 |
| HNAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HTOM | 0 | 0 | 0 |
| NHNA | 0 | 0 | 0 |
| HIA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| NA | 0 | 0 | 0 |
| HIAC | 0 | 0 | 0 |
• Henderson County population
35.8 mi, 
87°
• Posey County
26.5 mi, 
47°
• Saline County
17.4 mi, 
266°
• Union County
16.9 mi, 
116°
• White County
22.2 mi, 
6°
• Webster County
34.3 mi, 120°
• Crittenden County
29.2 mi, 
166°
• Hamilton County
27.7 mi, 
322°
• Pope County
29.8 mi, 
215°
• Hardin County
17.5 mi, 
186°
[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
*Randolph Illinois Notes
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