Last official estimated population of Monroe County was 7,984 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Iowa state population. Area of Monroe County is 434.3 mi² (=1124.8 km²), in this year population density was 18.38 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Monroe County population in 2024 would be 8,019 [0].
Historical population of Monroe County for period 1850-2014 [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
[1850-1860] +11.56 %/yr
[1860-1870] +3.98 %/yr
[1870-1880] +0.76 %/yr
[1880-1890] -0.04 %/yr
[1890-1900] +2.78 %/yr
[1900-1910] +3.52 %/yr
[1910-1920] -0.8 %/yr
[1920-1930] -4.37 %/yr
[1930-1940] -0.31 %/yr
[1940-1950] -2.06 %/yr
[1950-1960] -1.21 %/yr
[1960-1970] -1.11 %/yr
[1970-1980] -0.16 %/yr
[1980-1990] -1.26 %/yr
[1990-2000] -0.13 %/yr
[2000-2005] -0.14 %/yr
[2005-2010] +0.04 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Monroe County? Visit this page: Settlements in Monroe County, IA
Population of Monroe County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 243 | 200 | 443 |
| 5 to 9 | 278 | 284 | 562 |
| 10 to 14 | 299 | 261 | 560 |
| 15 to 19 | 269 | 223 | 492 |
| 20 to 24 | 230 | 206 | 436 |
| 25 to 29 | 198 | 178 | 376 |
| 30 to 34 | 225 | 224 | 449 |
| 35 to 39 | 218 | 244 | 462 |
| 40 to 44 | 242 | 233 | 475 |
| 45 to 49 | 252 | 246 | 498 |
| 50 to 54 | 296 | 300 | 596 |
| 55 to 59 | 297 | 287 | 584 |
| 60 to 64 | 292 | 253 | 545 |
| 65 to 69 | 215 | 241 | 456 |
| 70 to 74 | 163 | 181 | 344 |
| 75 to 79 | 134 | 152 | 286 |
| 80 to 84 | 91 | 113 | 204 |
| 85+ | 74 | 159 | 233 |
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 | 3963 | 3910 | 7,873 |
| NH | 3936 | 3875 | 7,811 |
| WA | 3921 | 3862 | 7,783 |
| NHWAC | 3889 | 3804 | 7,693 |
| NHWA | 3849 | 3765 | 7,614 |
| H | 80 | 110 | 190 |
| HWAC | 74 | 106 | 180 |
| HWA | 72 | 97 | 169 |
| TOM | 45 | 50 | 95 |
| BAC | 47 | 42 | 89 |
| AAC | 32 | 53 | 85 |
| NHTOM | 42 | 41 | 83 |
| NHAAC | 31 | 52 | 83 |
| NHBAC | 41 | 37 | 78 |
| AA | 20 | 46 | 66 |
| NHAA | 19 | 45 | 64 |
| IAC | 19 | 29 | 48 |
| BA | 26 | 20 | 46 |
| NHBA | 22 | 18 | 40 |
| NHIAC | 17 | 22 | 39 |
| HTOM | 3 | 9 | 12 |
| HBAC | 6 | 5 | 11 |
| IA | 4 | 6 | 10 |
| NHIA | 4 | 5 | 9 |
| HIAC | 2 | 7 | 9 |
| HBA | 4 | 2 | 6 |
| NAC | 1 | 3 | 4 |
| NHNAC | 1 | 3 | 4 |
| HAAC | 1 | 1 | 2 |
| HAA | 1 | 1 | 2 |
| HIA | 0 | 1 | 1 |
| NA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Warren County population
41.9 mi, 
300°
• Wapello County
24 mi, 
89°
• Marion County
23.9 mi, 
330°
• Mahaska County
24.1 mi, 
30°
• Appanoose County
19.7 mi, 
180°
• Keokuk County
42.1 mi, 
60°
• Lucas County
24.1 mi, 
270°
• Davis County
30.9 mi, 
128°
• Wayne County
31.4 mi, 
230°
• Putnam County
38.8 mi, 
191°
[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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