Last official estimated population of Lucas County was 8,889 (year 2014)[1]. This was 0.003% of total US population and 0.3% of total Iowa state population. Area of Lucas County is 434.4 mi² (=1125.1 km²), in this year population density was 20.46 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Lucas County population in 2024 would be 8,867 [0].
Historical population of Lucas 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] +28.47 %/yr
[1860-1870] +6.06 %/yr
[1870-1880] +3.41 %/yr
[1880-1890] +0.02 %/yr
[1890-1900] +1.02 %/yr
[1900-1910] -1.79 %/yr
[1910-1920] +1.54 %/yr
[1920-1930] -0.37 %/yr
[1930-1940] -0.37 %/yr
[1940-1950] -1.87 %/yr
[1950-1960] -0.99 %/yr
[1960-1970] -0.72 %/yr
[1970-1980] +0.15 %/yr
[1980-1990] -1.28 %/yr
[1990-2000] +0.37 %/yr
[2000-2005] +0.11 %/yr
[2005-2010] -1.22 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Lucas County? Visit this page: Settlements in Lucas County, IA
Population of Lucas County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 245 | 240 | 485 |
| 5 to 9 | 295 | 257 | 552 |
| 10 to 14 | 325 | 276 | 601 |
| 15 to 19 | 308 | 268 | 576 |
| 20 to 24 | 246 | 221 | 467 |
| 25 to 29 | 188 | 195 | 383 |
| 30 to 34 | 206 | 187 | 393 |
| 35 to 39 | 224 | 215 | 439 |
| 40 to 44 | 225 | 216 | 441 |
| 45 to 49 | 281 | 265 | 546 |
| 50 to 54 | 337 | 330 | 667 |
| 55 to 59 | 330 | 343 | 673 |
| 60 to 64 | 338 | 309 | 647 |
| 65 to 69 | 245 | 254 | 499 |
| 70 to 74 | 218 | 208 | 426 |
| 75 to 79 | 162 | 182 | 344 |
| 80 to 84 | 99 | 156 | 255 |
| 85+ | 115 | 192 | 307 |
Lucas 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 | 4345 | 4279 | 8,624 |
| NH | 4320 | 4267 | 8,587 |
| WA | 4315 | 4252 | 8,567 |
| NHWAC | 4285 | 4237 | 8,522 |
| NHWA | 4259 | 4211 | 8,470 |
| H | 67 | 47 | 114 |
| HWAC | 60 | 42 | 102 |
| HWA | 56 | 41 | 97 |
| TOM | 32 | 27 | 59 |
| NHTOM | 28 | 26 | 54 |
| IAC | 26 | 24 | 50 |
| BAC | 29 | 16 | 45 |
| NHIAC | 21 | 20 | 41 |
| AAC | 19 | 20 | 39 |
| NHAAC | 19 | 20 | 39 |
| NHBAC | 23 | 14 | 37 |
| AA | 11 | 16 | 27 |
| NHAA | 11 | 16 | 27 |
| BA | 17 | 8 | 25 |
| NHBA | 14 | 6 | 20 |
| IA | 10 | 10 | 20 |
| NHIA | 6 | 7 | 13 |
| HIAC | 5 | 4 | 9 |
| HBAC | 6 | 2 | 8 |
| HIA | 4 | 3 | 7 |
| HTOM | 4 | 1 | 5 |
| NAC | 3 | 2 | 5 |
| NHNAC | 3 | 2 | 5 |
| HBA | 3 | 2 | 5 |
| NA | 2 | 1 | 3 |
| NHNA | 2 | 1 | 3 |
| HNAC | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Warren County population
24.2 mi, 
330°
• Marion County
24 mi, 
30°
• Mahaska County
41.6 mi, 
60°
• Madison County
41.1 mi, 
300°
• Appanoose County
31.2 mi, 
129°
• Clarke County
23.6 mi, 
269°
• Decatur County
31.3 mi, 
229°
• Monroe County
24.1 mi, 
90°
• Wayne County
20.3 mi, 
180°
• Putnam County
41.8 mi, 
156°
[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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