Last official estimated population of Monroe County was 33,009 (year 2014)[1]. This was 0.01% of total US population and 0.3% of total Illinois state population. Area of Monroe County is 398.0 mi² (=1030.9 km²), in this year population density was 82.93 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Monroe County population in 2026 would be 33,165 [0].
Historical population of Monroe 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] +2.67 %/yr
[1830-1840] +8.4 %/yr
[1840-1850] +5.53 %/yr
[1850-1860] +5.27 %/yr
[1860-1870] +0.12 %/yr
[1870-1880] +0.53 %/yr
[1880-1890] -0.55 %/yr
[1890-1900] +0.67 %/yr
[1900-1910] -0.25 %/yr
[1910-1920] -0.51 %/yr
[1920-1930] -0.37 %/yr
[1930-1940] +0.31 %/yr
[1940-1950] +0.41 %/yr
[1950-1960] +1.56 %/yr
[1960-1970] +1.96 %/yr
[1970-1980] +0.66 %/yr
[1980-1990] +1.09 %/yr
[1990-2000] +2.11 %/yr
[2000-2005] +2.34 %/yr
[2005-2010] +1.23 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Monroe County? Visit this page: Settlements in Monroe County, IL
Population of Monroe County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 935 | 811 | 1,746 |
| 5 to 9 | 1066 | 1069 | 2,135 |
| 10 to 14 | 1258 | 1077 | 2,335 |
| 15 to 19 | 1173 | 1047 | 2,220 |
| 20 to 24 | 901 | 854 | 1,755 |
| 25 to 29 | 870 | 839 | 1,709 |
| 30 to 34 | 961 | 982 | 1,943 |
| 35 to 39 | 1046 | 969 | 2,015 |
| 40 to 44 | 1070 | 1102 | 2,172 |
| 45 to 49 | 1159 | 1341 | 2,500 |
| 50 to 54 | 1404 | 1432 | 2,836 |
| 55 to 59 | 1423 | 1416 | 2,839 |
| 60 to 64 | 1088 | 1046 | 2,134 |
| 65 to 69 | 817 | 779 | 1,596 |
| 70 to 74 | 560 | 610 | 1,170 |
| 75 to 79 | 416 | 552 | 968 |
| 80 to 84 | 310 | 478 | 788 |
| 85+ | 304 | 557 | 861 |
Monroe 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 | 16572 | 16754 | 33,326 |
| NH | 16512 | 16675 | 33,187 |
| WA | 16436 | 16625 | 33,061 |
| NHWAC | 16349 | 16480 | 32,829 |
| NHWA | 16218 | 16363 | 32,581 |
| H | 249 | 286 | 535 |
| HWAC | 223 | 274 | 497 |
| HWA | 218 | 262 | 480 |
| TOM | 141 | 138 | 279 |
| NHTOM | 136 | 125 | 261 |
| AAC | 104 | 138 | 242 |
| NHAAC | 100 | 136 | 236 |
| BAC | 120 | 101 | 221 |
| NHBAC | 110 | 90 | 200 |
| IAC | 92 | 99 | 191 |
| NHIAC | 81 | 87 | 168 |
| AA | 67 | 99 | 166 |
| NHAA | 63 | 98 | 161 |
| BA | 73 | 57 | 130 |
| NHBA | 65 | 52 | 117 |
| IA | 33 | 39 | 72 |
| NHIA | 26 | 34 | 60 |
| NAC | 17 | 9 | 26 |
| HIAC | 11 | 12 | 23 |
| HBAC | 10 | 11 | 21 |
| NHNAC | 10 | 9 | 19 |
| HTOM | 5 | 13 | 18 |
| NA | 11 | 3 | 14 |
| HBA | 8 | 5 | 13 |
| HIA | 7 | 5 | 12 |
| HNAC | 7 | 0 | 7 |
| HNA | 7 | 0 | 7 |
| NHNA | 4 | 3 | 7 |
| HAAC | 4 | 2 | 6 |
| HAA | 4 | 1 | 5 |
• St. Louis County population
28.9 mi, 
330°
• St. Charles County
43.9 mi, 
322°
• St. Louis city
25 mi, 
351°
• St. Clair County
19 mi, 
45°
• Madison County
40.8 mi, 
21°
• Jefferson County
19.8 mi, 
265°
• St. Francois County
36 mi, 
206°
• Randolph County
24.7 mi, 
128°
• Ste. Genevieve County
27.1 mi, 
177°
• Washington County
41.6 mi, 
82°
[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
*St. Clair, Randolph Illinois Notes
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