Last official estimated population of Plymouth County was 24,977 (year 2014)[1]. This was 0.008% of total US population and 0.8% of total Iowa state population. Area of Plymouth County is 863.7 mi² (=2236.9 km²), in this year population density was 28.92 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Plymouth County population in 2026 would be 24,950 [0].
Historical population of Plymouth County for period 1860-2014 [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
[1860-1870] +30.98 %/yr
[1870-1880] +14.57 %/yr
[1880-1890] +8.61 %/yr
[1890-1900] +1.27 %/yr
[1900-1910] +0.41 %/yr
[1910-1920] +0.2 %/yr
[1920-1930] +0.24 %/yr
[1930-1940] -0.28 %/yr
[1940-1950] -0.11 %/yr
[1950-1960] +0.28 %/yr
[1960-1970] +0.17 %/yr
[1970-1980] +0.18 %/yr
[1980-1990] -0.56 %/yr
[1990-2000] +0.61 %/yr
[2000-2005] +0.1 %/yr
[2005-2010] +0 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Plymouth County? Visit this page: Settlements in Plymouth County, IA
Population of Plymouth County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 740 | 720 | 1,460 |
| 5 to 9 | 894 | 896 | 1,790 |
| 10 to 14 | 955 | 854 | 1,809 |
| 15 to 19 | 898 | 859 | 1,757 |
| 20 to 24 | 640 | 638 | 1,278 |
| 25 to 29 | 573 | 542 | 1,115 |
| 30 to 34 | 695 | 695 | 1,390 |
| 35 to 39 | 733 | 718 | 1,451 |
| 40 to 44 | 734 | 722 | 1,456 |
| 45 to 49 | 830 | 739 | 1,569 |
| 50 to 54 | 906 | 946 | 1,852 |
| 55 to 59 | 967 | 966 | 1,933 |
| 60 to 64 | 845 | 782 | 1,627 |
| 65 to 69 | 622 | 648 | 1,270 |
| 70 to 74 | 467 | 522 | 989 |
| 75 to 79 | 334 | 411 | 745 |
| 80 to 84 | 289 | 392 | 681 |
| 85+ | 237 | 465 | 702 |
Plymouth 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 | 12126 | 12307 | 24,433 |
| WA | 12016 | 12170 | 24,186 |
| NH | 11836 | 12030 | 23,866 |
| NHWAC | 11646 | 11859 | 23,505 |
| NHWA | 11548 | 11738 | 23,286 |
| H | 523 | 485 | 1,008 |
| HWAC | 480 | 448 | 928 |
| HWA | 468 | 432 | 900 |
| TOM | 115 | 144 | 259 |
| BAC | 128 | 117 | 245 |
| NHTOM | 102 | 127 | 229 |
| NHBAC | 121 | 107 | 228 |
| AAC | 98 | 116 | 214 |
| IAC | 103 | 104 | 207 |
| NHAAC | 91 | 112 | 203 |
| AA | 68 | 77 | 145 |
| NHAA | 62 | 74 | 136 |
| BA | 79 | 55 | 134 |
| NHIAC | 65 | 69 | 134 |
| NHBA | 77 | 52 | 129 |
| IA | 66 | 55 | 121 |
| HIAC | 38 | 35 | 73 |
| NHIA | 36 | 30 | 66 |
| HIA | 30 | 25 | 55 |
| NAC | 22 | 20 | 42 |
| NHNAC | 17 | 15 | 32 |
| HTOM | 13 | 17 | 30 |
| NA | 15 | 14 | 29 |
| NHNA | 11 | 9 | 20 |
| HBAC | 7 | 10 | 17 |
| HAAC | 7 | 4 | 11 |
| HNAC | 5 | 5 | 10 |
| HAA | 6 | 3 | 9 |
| HNA | 4 | 5 | 9 |
| HBA | 2 | 3 | 5 |
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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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