Last official estimated population of Buchanan County was 20,946 (year 2014)[1]. This was 0.007% of total US population and 0.7% of total Iowa state population. Area of Buchanan County is 573.1 mi² (=1484.4 km²), in this year population density was 36.55 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Buchanan County population in 2026 would be 20,910 [0].
Historical population of Buchanan 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] +31.36 %/yr
[1860-1870] +7.98 %/yr
[1870-1880] +0.85 %/yr
[1880-1890] +0.24 %/yr
[1890-1900] +1.21 %/yr
[1900-1910] -0.81 %/yr
[1910-1920] +0.07 %/yr
[1920-1930] -0.17 %/yr
[1930-1940] +0.71 %/yr
[1940-1950] +0.44 %/yr
[1950-1960] +0.17 %/yr
[1960-1970] -0.25 %/yr
[1970-1980] +0.52 %/yr
[1980-1990] -0.94 %/yr
[1990-2000] +0.12 %/yr
[2000-2005] -0.25 %/yr
[2005-2010] +0.12 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Buchanan County? Visit this page: Settlements in Buchanan County, IA
Population of Buchanan County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 694 | 730 | 1,424 |
| 5 to 9 | 806 | 802 | 1,608 |
| 10 to 14 | 858 | 791 | 1,649 |
| 15 to 19 | 725 | 634 | 1,359 |
| 20 to 24 | 564 | 538 | 1,102 |
| 25 to 29 | 574 | 583 | 1,157 |
| 30 to 34 | 699 | 634 | 1,333 |
| 35 to 39 | 607 | 579 | 1,186 |
| 40 to 44 | 599 | 567 | 1,166 |
| 45 to 49 | 627 | 671 | 1,298 |
| 50 to 54 | 785 | 769 | 1,554 |
| 55 to 59 | 739 | 779 | 1,518 |
| 60 to 64 | 656 | 613 | 1,269 |
| 65 to 69 | 513 | 535 | 1,048 |
| 70 to 74 | 383 | 411 | 794 |
| 75 to 79 | 299 | 343 | 642 |
| 80 to 84 | 167 | 239 | 406 |
| 85+ | 177 | 348 | 525 |
Buchanan 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 | 10329 | 10461 | 20,790 |
| NH | 10304 | 10439 | 20,743 |
| WA | 10236 | 10346 | 20,582 |
| NHWAC | 10178 | 10348 | 20,526 |
| NHWA | 10088 | 10236 | 20,324 |
| H | 168 | 127 | 295 |
| HWAC | 151 | 113 | 264 |
| HWA | 148 | 110 | 258 |
| BAC | 113 | 105 | 218 |
| TOM | 95 | 119 | 214 |
| NHTOM | 91 | 116 | 207 |
| NHBAC | 105 | 99 | 204 |
| AAC | 72 | 66 | 138 |
| NHAAC | 69 | 66 | 135 |
| IAC | 56 | 52 | 108 |
| BA | 66 | 33 | 99 |
| AA | 48 | 43 | 91 |
| NHAA | 47 | 43 | 90 |
| NHBA | 59 | 29 | 88 |
| NHIAC | 44 | 42 | 86 |
| IA | 27 | 23 | 50 |
| NHIA | 19 | 14 | 33 |
| HIAC | 12 | 10 | 22 |
| HIA | 8 | 9 | 17 |
| HBAC | 8 | 6 | 14 |
| HBA | 7 | 4 | 11 |
| NAC | 3 | 7 | 10 |
| NHNAC | 3 | 6 | 9 |
| HTOM | 4 | 3 | 7 |
| HAAC | 3 | 0 | 3 |
| NA | 0 | 2 | 2 |
| HAA | 1 | 0 | 1 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
• Linn County population
29.8 mi, 
155°
• Black Hawk County
23.9 mi, 
270°
• Benton County
28.4 mi, 
203°
• Bremer County
32.8 mi, 
310°
• Fayette County
27.2 mi, 
359°
• Jones County
43.9 mi, 
122°
• Clayton County
36.6 mi, 
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• Delaware County
24 mi, 
89°
• Tama County
44.6 mi, 
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• Chickasaw County
47.4 mi, 
329°
[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
*Delaware Iowa Notes
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