Last official estimated population of Martin County was 10,376 (year 2014)[1]. This was 0.003% of total US population and 0.2% of total Indiana state population. Area of Martin County is 340.4 mi² (=881.7 km²), in this year population density was 30.48 p/mi². If population growth rate would be same as in period 2010-2014 (+0.1%/yr), Martin County population in 2023 would be 10,471 [0].
Historical population of Martin 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] +6.89 %/yr
[1830-1840] +6.78 %/yr
[1840-1850] +4.37 %/yr
[1850-1860] +4.21 %/yr
[1860-1870] +2.15 %/yr
[1870-1880] +1.96 %/yr
[1880-1890] +0.36 %/yr
[1890-1900] +0.52 %/yr
[1900-1910] -1.27 %/yr
[1910-1920] -0.87 %/yr
[1920-1930] -1.59 %/yr
[1930-1940] +0.19 %/yr
[1940-1950] +0.36 %/yr
[1950-1960] -0.07 %/yr
[1960-1970] +0.34 %/yr
[1970-1980] +0.03 %/yr
[1980-1990] -0.59 %/yr
[1990-2000] -0 %/yr
[2000-2005] -0.09 %/yr
[2005-2010] +0.02 %/yr
[2010-2014] +0.1 %/yr
Looking for settlements in Martin County? Visit this page: Settlements in Martin County, IN
Population of Martin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 328 | 294 | 622 |
| 5 to 9 | 350 | 306 | 656 |
| 10 to 14 | 342 | 286 | 628 |
| 15 to 19 | 361 | 325 | 686 |
| 20 to 24 | 265 | 285 | 550 |
| 25 to 29 | 260 | 267 | 527 |
| 30 to 34 | 307 | 267 | 574 |
| 35 to 39 | 297 | 285 | 582 |
| 40 to 44 | 312 | 295 | 607 |
| 45 to 49 | 343 | 328 | 671 |
| 50 to 54 | 425 | 384 | 809 |
| 55 to 59 | 421 | 395 | 816 |
| 60 to 64 | 350 | 381 | 731 |
| 65 to 69 | 278 | 296 | 574 |
| 70 to 74 | 204 | 239 | 443 |
| 75 to 79 | 149 | 189 | 338 |
| 80 to 84 | 96 | 116 | 212 |
| 85+ | 72 | 105 | 177 |
Martin 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 | 5124 | 4996 | 10,120 |
| WAC | 5110 | 4995 | 10,105 |
| NHWAC | 5078 | 4951 | 10,029 |
| WA | 5063 | 4952 | 10,015 |
| NHWA | 5034 | 4912 | 9,946 |
| TOM | 50 | 46 | 96 |
| NHTOM | 46 | 42 | 88 |
| H | 36 | 47 | 83 |
| IAC | 40 | 41 | 81 |
| HWAC | 32 | 44 | 76 |
| NHIAC | 34 | 35 | 69 |
| HWA | 29 | 40 | 69 |
| BAC | 39 | 22 | 61 |
| NHBAC | 37 | 21 | 58 |
| NHAAC | 21 | 29 | 50 |
| AAC | 21 | 29 | 50 |
| IA | 21 | 14 | 35 |
| NHAA | 9 | 24 | 33 |
| AA | 9 | 24 | 33 |
| NHIA | 18 | 11 | 29 |
| BA | 17 | 6 | 23 |
| NHBA | 17 | 6 | 23 |
| HIAC | 6 | 6 | 12 |
| HTOM | 4 | 4 | 8 |
| HIA | 3 | 3 | 6 |
| NHNAC | 0 | 4 | 4 |
| NAC | 0 | 4 | 4 |
| HBAC | 2 | 1 | 3 |
| NA | 0 | 1 | 1 |
| NHNA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HBA | 0 | 0 | 0 |
| HAAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Monroe County population
34.8 mi, 
25°
• Lawrence County
19.3 mi, 
61°
• Dubois County
23.3 mi, 
189°
• Knox County
33.4 mi, 
267°
• Greene County
26 mi, 
335°
• Daviess County
14.6 mi, 267°
• Washington County
38.3 mi, 
100°
• Orange County
20.1 mi, 
122°
• Pike County
31.5 mi, 
227°
• Crawford County
34.7 mi, 
145°
[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
*Knox Indiana Notes
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