Population.us > Counties > Iowa > O'Brien County

Population of O'Brien County

Last official estimated population of O'Brien County was 14,400 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of O'Brien County is 573.2 mi² (=1484.6 km²), in this year population density was 25.12 p/mi². If population growth rate would be same as in period 2010-2014 (+0%/yr), O'Brien County population in 2021 would be 14,404 [0].


Historical population

Historical population of O'Brien County for period 1860-2014 [1] , [2] , [3]:

Maps: Population, population density, population changes

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.

PopulationDensityChangesLegendsPosition

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Annual growth rate

[1860-1870] +56.72 %/yr
[1870-1880] +19.24 %/yr
[1880-1890] +12.13 %/yr
[1890-1900] +2.66 %/yr
[1900-1910] +0.16 %/yr
[1910-1920] +0.99 %/yr
[1920-1930] -0.34 %/yr
[1930-1940] +0.47 %/yr
[1940-1950] -0.17 %/yr
[1950-1960] -0.07 %/yr
[1960-1970] -0.72 %/yr
[1970-1980] -0.32 %/yr
[1980-1990] -0.94 %/yr
[1990-2000] -0.23 %/yr
[2000-2005] -0.73 %/yr
[2005-2010] -0.21 %/yr
[2010-2014] +0 %/yr

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Demography

Population of O'Brien County by age groups male (M) and female (F)[1b]

Age Gr. (M) (F) Total
0 to 4 407 435 842
5 to 9 522 459 981
10 to 14 518 428 946
15 to 19 445 395 840
20 to 24 411 343 754
25 to 29 353 320 673
30 to 34 439 359 798
35 to 39 404 363 767
40 to 44 345 331 676
45 to 49 413 359 772
50 to 54 516 533 1,049
55 to 59 580 531 1,111
60 to 64 474 477 951
65 to 69 340 345 685
70 to 74 271 297 568
75 to 79 209 294 503
80 to 84 205 312 517
85+ 208 415 623

O'Brien 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 6917 6865 13,782
WA 6854 6801 13,655
NH 6694 6728 13,422
NHWAC 6586 6626 13,212
NHWA 6533 6581 13,114
H 366 268 634
HWAC 331 239 570
HWA 321 220 541
BAC 101 78 179
AAC 59 76 135
TOM 65 67 132
BA 78 53 131
NHAAC 54 71 125
NHBAC 71 52 123
NHTOM 55 48 103
AA 43 58 101
NHAA 41 57 98
NHBA 51 33 84
IAC 39 43 82
HBAC 30 26 56
NHIAC 30 26 56
HBA 27 20 47
IA 16 17 33
HTOM 10 19 29
HIAC 9 17 26
NHIA 11 9 20
HIA 5 8 13
NAC 9 3 12
NHNAC 8 3 11
HAAC 5 5 10
NA 4 0 4
NHNA 3 0 3
HAA 2 1 3
HNAC 1 0 1
HNA 1 0 1

Counties near O'Brien County

Sioux County population 27.9 mi, 269°
Plymouth County 38.3 mi, 231°
Nobles County 41.6 mi, 350°
Buena Vista County 34 mi, 133°
Dickinson County 30.2 mi, 45°
Clay County 24 mi, 90°
Cherokee County 23.6 mi, 180°
Lyon County 35.9 mi, 305°
Jackson County 47.1 mi, 30°
Osceola County 20.4 mi, 358°


Sources, notices

[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

Iowa Notes

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