Last official estimated population of Marengo County was 20,951 (year 2014)[1]. This was 0.007% of total US population and 0.4% of total Alabama state population. Area of Marengo County is 982.7 mi² (=2545.1 km²), in this year population density was 21.32 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Marengo County population in 2026 would be 20,725 [0].
Historical population of Marengo 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] +10.13 %/yr
[1830-1840] +8.41 %/yr
[1840-1850] +4.89 %/yr
[1850-1860] +1.14 %/yr
[1860-1870] -1.74 %/yr
[1870-1880] +1.68 %/yr
[1880-1890] +0.69 %/yr
[1890-1900] +1.48 %/yr
[1900-1910] +0.41 %/yr
[1910-1920] -1.01 %/yr
[1920-1930] +0.1 %/yr
[1930-1940] -0.19 %/yr
[1940-1950] -1.9 %/yr
[1950-1960] -0.84 %/yr
[1960-1970] -1.28 %/yr
[1970-1980] +0.5 %/yr
[1980-1990] -0.81 %/yr
[1990-2000] -0.24 %/yr
[2000-2005] -0.87 %/yr
[2005-2010] -0.51 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Marengo County? Visit this page: Settlements in Marengo County, AL
Population of Marengo County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 571 | 638 | 1,209 |
| 5 to 9 | 632 | 641 | 1,273 |
| 10 to 14 | 663 | 662 | 1,325 |
| 15 to 19 | 657 | 642 | 1,299 |
| 20 to 24 | 657 | 671 | 1,328 |
| 25 to 29 | 542 | 604 | 1,146 |
| 30 to 34 | 466 | 547 | 1,013 |
| 35 to 39 | 547 | 587 | 1,134 |
| 40 to 44 | 542 | 710 | 1,252 |
| 45 to 49 | 582 | 665 | 1,247 |
| 50 to 54 | 617 | 748 | 1,365 |
| 55 to 59 | 709 | 794 | 1,503 |
| 60 to 64 | 617 | 659 | 1,276 |
| 65 to 69 | 539 | 630 | 1,169 |
| 70 to 74 | 438 | 479 | 917 |
| 75 to 79 | 288 | 369 | 657 |
| 80 to 84 | 182 | 302 | 484 |
| 85+ | 158 | 355 | 513 |
Marengo 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 |
| NH | 9162 | 10465 | 19,627 |
| BAC | 4666 | 5669 | 10,335 |
| NHBAC | 4633 | 5627 | 10,260 |
| BA | 4621 | 5627 | 10,248 |
| NHBA | 4590 | 5588 | 10,178 |
| WAC | 4703 | 4991 | 9,694 |
| WA | 4624 | 4916 | 9,540 |
| NHWAC | 4510 | 4808 | 9,318 |
| NHWA | 4436 | 4739 | 9,175 |
| H | 245 | 238 | 483 |
| HWAC | 193 | 183 | 376 |
| HWA | 188 | 177 | 365 |
| TOM | 87 | 83 | 170 |
| NHTOM | 82 | 76 | 158 |
| IAC | 64 | 62 | 126 |
| NHIAC | 60 | 58 | 118 |
| AAC | 35 | 47 | 82 |
| NHAAC | 34 | 43 | 77 |
| HBAC | 33 | 42 | 75 |
| HBA | 31 | 39 | 70 |
| AA | 23 | 35 | 58 |
| NHAA | 22 | 33 | 55 |
| IA | 29 | 25 | 54 |
| NHIA | 28 | 25 | 53 |
| NAC | 28 | 21 | 49 |
| NA | 23 | 17 | 40 |
| HNAC | 19 | 14 | 33 |
| HNA | 19 | 13 | 32 |
| NHNAC | 9 | 7 | 16 |
| HTOM | 5 | 7 | 12 |
| HIAC | 4 | 4 | 8 |
| NHNA | 4 | 4 | 8 |
| HAAC | 1 | 4 | 5 |
| HAA | 1 | 2 | 3 |
| HIA | 1 | 0 | 1 |
• Lauderdale County population
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40 mi, 
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38.9 mi, 
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51.9 mi, 
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36.3 mi, 
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• Choctaw County
32.1 mi, 
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• Sumter County
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• Wilcox County
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• Perry County
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42.5 mi, 
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[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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