Last official estimated population of Linn County was 12,753 (year 2014)[1]. This was 0.004% of total US population and 0.2% of total Missouri state population. Area of Linn County is 621.4 mi² (=1609.4 km²), in this year population density was 20.52 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Linn County population in 2026 would be 12,729 [0].
Historical population of Linn County for period 1840-2014 [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

[1840-1850] +6.1 %/yr
[1850-1860] +8.43 %/yr
[1860-1870] +5.73 %/yr
[1870-1880] +2.33 %/yr
[1880-1890] +1.88 %/yr
[1890-1900] +0.56 %/yr
[1900-1910] -0.1 %/yr
[1910-1920] -0.19 %/yr
[1920-1930] -0.6 %/yr
[1930-1940] -0.86 %/yr
[1940-1950] -1.26 %/yr
[1950-1960] -1.14 %/yr
[1960-1970] -1.05 %/yr
[1970-1980] +0.24 %/yr
[1980-1990] -1.09 %/yr
[1990-2000] -0.09 %/yr
[2000-2005] -1.01 %/yr
[2005-2010] -0.48 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Linn County? Visit this page: Settlements in Linn County, MO
Population of Linn County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 374 | 314 | 688 |
| 5 to 9 | 439 | 415 | 854 |
| 10 to 14 | 420 | 444 | 864 |
| 15 to 19 | 414 | 388 | 802 |
| 20 to 24 | 354 | 322 | 676 |
| 25 to 29 | 274 | 287 | 561 |
| 30 to 34 | 325 | 340 | 665 |
| 35 to 39 | 334 | 344 | 678 |
| 40 to 44 | 332 | 339 | 671 |
| 45 to 49 | 350 | 331 | 681 |
| 50 to 54 | 440 | 485 | 925 |
| 55 to 59 | 445 | 495 | 940 |
| 60 to 64 | 416 | 409 | 825 |
| 65 to 69 | 358 | 377 | 735 |
| 70 to 74 | 282 | 309 | 591 |
| 75 to 79 | 178 | 259 | 437 |
| 80 to 84 | 135 | 212 | 347 |
| 85+ | 108 | 263 | 371 |
Linn 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 | 5886 | 6244 | 12,130 |
| NH | 5861 | 6213 | 12,074 |
| WA | 5796 | 6174 | 11,970 |
| NHWAC | 5773 | 6134 | 11,907 |
| NHWA | 5693 | 6078 | 11,771 |
| H | 117 | 120 | 237 |
| HWAC | 113 | 110 | 223 |
| HWA | 103 | 96 | 199 |
| BAC | 108 | 82 | 190 |
| NHBAC | 103 | 71 | 174 |
| TOM | 92 | 74 | 166 |
| NHTOM | 81 | 58 | 139 |
| IAC | 54 | 54 | 108 |
| BA | 54 | 43 | 97 |
| NHBA | 53 | 42 | 95 |
| NHIAC | 48 | 40 | 88 |
| AAC | 24 | 23 | 47 |
| IA | 19 | 23 | 42 |
| NHAAC | 20 | 21 | 41 |
| NHIA | 18 | 17 | 35 |
| AA | 17 | 18 | 35 |
| NHAA | 16 | 17 | 33 |
| HTOM | 11 | 16 | 27 |
| HIAC | 6 | 14 | 20 |
| HBAC | 5 | 11 | 16 |
| NAC | 3 | 5 | 8 |
| NHNAC | 3 | 5 | 8 |
| HIA | 1 | 6 | 7 |
| HAAC | 4 | 2 | 6 |
| HBA | 1 | 1 | 2 |
| HAA | 1 | 1 | 2 |
| NA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Adair County population
34.9 mi,
49°
• Randolph County
44 mi,
131°
• Macon County
28.9 mi,
94°
• Livingston County
24.1 mi,
255°
• Grundy County
29.7 mi,
305°
• Carroll County
36.7 mi,
214°
• Chariton County
25.2 mi,
161°
• Sullivan County
23.8 mi,
359°
• Putnam County
42.7 mi,
6°
• Mercer County
45.5 mi,
327°
[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
*Chariton Missouri Notes
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