Last official estimated population of St. Joseph County was 266,784 (year 2014)[1]. This was 0.084% of total US population and 4% of total Indiana state population. Area of St. Joseph County is 461.4 mi² (=1195 km²), in this year population density was 578.22 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), St. Joseph County population in 2024 would be 266,417 [0].
Historical population of St. Joseph County for period 1830-2014 [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
[1830-1840] +36.46 %/yr
[1840-1850] +5.48 %/yr
[1850-1860] +5.35 %/yr
[1860-1870] +3.21 %/yr
[1870-1880] +2.74 %/yr
[1880-1890] +2.5 %/yr
[1890-1900] +3.32 %/yr
[1900-1910] +3.66 %/yr
[1910-1920] +2.05 %/yr
[1920-1930] +4.47 %/yr
[1930-1940] +0.11 %/yr
[1940-1950] +2.4 %/yr
[1950-1960] +1.53 %/yr
[1960-1970] +0.27 %/yr
[1970-1980] -0.14 %/yr
[1980-1990] +0.22 %/yr
[1990-2000] +0.73 %/yr
[2000-2005] -0.05 %/yr
[2005-2010] +0.16 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in St. Joseph County? Visit this page: Settlements in St. Joseph County, IN
Population of St. Joseph County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8735 | 8605 | 17,340 |
| 5 to 9 | 9134 | 8696 | 17,830 |
| 10 to 14 | 9309 | 8676 | 17,985 |
| 15 to 19 | 9962 | 10181 | 20,143 |
| 20 to 24 | 9862 | 10683 | 20,545 |
| 25 to 29 | 8941 | 9035 | 17,976 |
| 30 to 34 | 8366 | 8528 | 16,894 |
| 35 to 39 | 7663 | 7924 | 15,587 |
| 40 to 44 | 7932 | 8238 | 16,170 |
| 45 to 49 | 7857 | 8296 | 16,153 |
| 50 to 54 | 8832 | 9230 | 18,062 |
| 55 to 59 | 8944 | 9321 | 18,265 |
| 60 to 64 | 7894 | 8459 | 16,353 |
| 65 to 69 | 5759 | 6284 | 12,043 |
| 70 to 74 | 3857 | 4678 | 8,535 |
| 75 to 79 | 2633 | 3557 | 6,190 |
| 80 to 84 | 2002 | 3202 | 5,204 |
| 85+ | 2102 | 4241 | 6,343 |
St. Joseph 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 | 118670 | 127121 | 245,791 |
| WAC | 109239 | 114773 | 224,012 |
| WA | 105899 | 111251 | 217,150 |
| NHWAC | 99295 | 105264 | 204,559 |
| NHWA | 96315 | 102140 | 198,455 |
| BAC | 18921 | 21042 | 39,963 |
| NHBAC | 18028 | 20093 | 38,121 |
| BA | 16676 | 18677 | 35,353 |
| NHBA | 16005 | 17968 | 33,973 |
| H | 11114 | 10713 | 21,827 |
| HWAC | 9944 | 9509 | 19,453 |
| HWA | 9584 | 9111 | 18,695 |
| AAC | 3592 | 4096 | 7,688 |
| NHAAC | 3426 | 3914 | 7,340 |
| TOM | 3549 | 3758 | 7,307 |
| NHTOM | 3153 | 3324 | 6,477 |
| AA | 2839 | 3272 | 6,111 |
| NHAA | 2741 | 3178 | 5,919 |
| IAC | 1623 | 1747 | 3,370 |
| NHIAC | 1107 | 1243 | 2,350 |
| HBAC | 893 | 949 | 1,842 |
| IA | 708 | 725 | 1,433 |
| HBA | 671 | 709 | 1,380 |
| HIAC | 516 | 504 | 1,020 |
| HTOM | 396 | 434 | 830 |
| NHIA | 365 | 411 | 776 |
| HIA | 343 | 314 | 657 |
| NAC | 247 | 287 | 534 |
| NHNAC | 195 | 209 | 404 |
| HAAC | 166 | 182 | 348 |
| NA | 113 | 151 | 264 |
| HAA | 98 | 94 | 192 |
| NHNA | 91 | 100 | 191 |
| HNAC | 52 | 78 | 130 |
| HNA | 22 | 51 | 73 |
• Elkhart County population
21.9 mi, 
93°
• Porter County
41.2 mi, 
259°
• Berrien County
26.3 mi, 
297°
• LaPorte County
24.1 mi, 258°
• Kosciusko County
34 mi, 
139°
• St. Joseph County
44.4 mi, 
62°
• Cass County
25.4 mi, 
35°
• Marshall County
20.2 mi, 
177°
• Starke County
29.5 mi, 
218°
• Fulton County
39.2 mi, 178°
[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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