Last official estimated population of Louisa County was 11,372 (year 2014)[1]. This was 0.004% of total US population and 0.4% of total Iowa state population. Area of Louisa County is 417.5 mi² (=1081.4 km²), in this year population density was 27.24 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Louisa County population in 2026 would be 11,327 [0].
Historical population of Louisa 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] +9.87 %/yr
[1850-1860] +7.7 %/yr
[1860-1870] +2.19 %/yr
[1870-1880] +0.2 %/yr
[1880-1890] -1.01 %/yr
[1890-1900] +1.3 %/yr
[1900-1910] -0.5 %/yr
[1910-1920] -0.54 %/yr
[1920-1930] -0.51 %/yr
[1930-1940] -0.17 %/yr
[1940-1950] -0.25 %/yr
[1950-1960] -0.76 %/yr
[1960-1970] +0.37 %/yr
[1970-1980] +1.22 %/yr
[1980-1990] -0.39 %/yr
[1990-2000] +0.5 %/yr
[2000-2005] -0.54 %/yr
[2005-2010] -0.81 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Louisa County? Visit this page: Settlements in Louisa County, IA
Population of Louisa County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 252 | 335 | 587 |
| 5 to 9 | 374 | 312 | 686 |
| 10 to 14 | 436 | 364 | 800 |
| 15 to 19 | 413 | 377 | 790 |
| 20 to 24 | 329 | 307 | 636 |
| 25 to 29 | 274 | 261 | 535 |
| 30 to 34 | 389 | 335 | 724 |
| 35 to 39 | 336 | 343 | 679 |
| 40 to 44 | 350 | 282 | 632 |
| 45 to 49 | 380 | 362 | 742 |
| 50 to 54 | 497 | 471 | 968 |
| 55 to 59 | 408 | 391 | 799 |
| 60 to 64 | 366 | 362 | 728 |
| 65 to 69 | 304 | 256 | 560 |
| 70 to 74 | 210 | 238 | 448 |
| 75 to 79 | 158 | 175 | 333 |
| 80 to 84 | 91 | 152 | 243 |
| 85+ | 95 | 176 | 271 |
Louisa 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 | 5398 | 5336 | 10,734 |
| WA | 5325 | 5286 | 10,611 |
| NH | 4705 | 4649 | 9,354 |
| NHWAC | 4470 | 4516 | 8,986 |
| NHWA | 4425 | 4477 | 8,902 |
| H | 957 | 850 | 1,807 |
| HWAC | 928 | 820 | 1,748 |
| HWA | 900 | 809 | 1,709 |
| AAC | 169 | 85 | 254 |
| NHAAC | 159 | 78 | 237 |
| AA | 152 | 78 | 230 |
| NHAA | 148 | 72 | 220 |
| BAC | 111 | 64 | 175 |
| NHBAC | 89 | 52 | 141 |
| TOM | 78 | 51 | 129 |
| IAC | 63 | 57 | 120 |
| BA | 74 | 42 | 116 |
| NHBA | 64 | 35 | 99 |
| NHTOM | 47 | 39 | 86 |
| NHIAC | 34 | 34 | 68 |
| IA | 24 | 34 | 58 |
| HIAC | 29 | 23 | 52 |
| HTOM | 31 | 12 | 43 |
| HBAC | 22 | 12 | 34 |
| NHIA | 13 | 18 | 31 |
| HIA | 11 | 16 | 27 |
| NAC | 11 | 11 | 22 |
| NHNAC | 8 | 10 | 18 |
| HBA | 10 | 7 | 17 |
| HAAC | 10 | 7 | 17 |
| NA | 9 | 8 | 17 |
| NHNA | 8 | 8 | 16 |
| HAA | 4 | 6 | 10 |
| HNAC | 3 | 1 | 4 |
| HNA | 1 | 0 | 1 |
• Rock Island County population
39.5 mi, 
64°
• Johnson County
35.6 mi, 
331°
• Muscatine County
19.7 mi, 
21°
• Des Moines County
21.2 mi, 
170°
• Washington County
25.5 mi, 
287°
• Henry County
21.9 mi, 
222°
• Cedar County
38.8 mi, 
9°
• Jefferson County
39.7 mi, 
248°
• Mercer County
26.8 mi, 
91°
• Henderson County
32.4 mi, 
149°
[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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