Last official estimated population of Jay County was 21,176 (year 2014)[1]. This was 0.007% of total US population and 0.3% of total Indiana state population. Area of Jay County is 384.1 mi² (=994.8 km²), in this year population density was 55.13 p/mi². If population growth rate would be same as in period 2010-2014 (-0.09%/yr), Jay County population in 2026 would be 20,947 [0].
Historical population of Jay 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] +6.2 %/yr
[1850-1860] +4.93 %/yr
[1860-1870] +2.78 %/yr
[1870-1880] +2.54 %/yr
[1880-1890] +1.99 %/yr
[1890-1900] +1.34 %/yr
[1900-1910] -0.72 %/yr
[1910-1920] -0.68 %/yr
[1920-1930] -1.11 %/yr
[1930-1940] +0.81 %/yr
[1940-1950] +0.24 %/yr
[1950-1960] -0.26 %/yr
[1960-1970] +0.44 %/yr
[1970-1980] -0.14 %/yr
[1980-1990] -0.77 %/yr
[1990-2000] +0.14 %/yr
[2000-2005] -0.2 %/yr
[2005-2010] -0.32 %/yr
[2010-2014] -0.09 %/yr
Looking for settlements in Jay County? Visit this page: Settlements in Jay County, IN
Population of Jay County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 747 | 735 | 1,482 |
| 5 to 9 | 741 | 717 | 1,458 |
| 10 to 14 | 812 | 756 | 1,568 |
| 15 to 19 | 761 | 734 | 1,495 |
| 20 to 24 | 623 | 634 | 1,257 |
| 25 to 29 | 603 | 552 | 1,155 |
| 30 to 34 | 586 | 570 | 1,156 |
| 35 to 39 | 587 | 547 | 1,134 |
| 40 to 44 | 655 | 697 | 1,352 |
| 45 to 49 | 711 | 694 | 1,405 |
| 50 to 54 | 723 | 771 | 1,494 |
| 55 to 59 | 732 | 702 | 1,434 |
| 60 to 64 | 629 | 670 | 1,299 |
| 65 to 69 | 524 | 601 | 1,125 |
| 70 to 74 | 395 | 430 | 825 |
| 75 to 79 | 301 | 359 | 660 |
| 80 to 84 | 150 | 255 | 405 |
| 85+ | 158 | 317 | 475 |
Jay 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 | 10312 | 10626 | 20,938 |
| WA | 10231 | 10539 | 20,770 |
| NH | 10099 | 10449 | 20,548 |
| NHWAC | 9984 | 10347 | 20,331 |
| NHWA | 9910 | 10268 | 20,178 |
| H | 339 | 292 | 631 |
| HWAC | 328 | 279 | 607 |
| HWA | 321 | 271 | 592 |
| TOM | 90 | 92 | 182 |
| NHTOM | 82 | 83 | 165 |
| BAC | 82 | 69 | 151 |
| NHBAC | 77 | 63 | 140 |
| AAC | 64 | 73 | 137 |
| IAC | 65 | 66 | 131 |
| NHAAC | 60 | 66 | 126 |
| NHIAC | 56 | 58 | 114 |
| AA | 45 | 57 | 102 |
| NHAA | 43 | 52 | 95 |
| BA | 54 | 33 | 87 |
| NHBA | 50 | 30 | 80 |
| IA | 16 | 19 | 35 |
| NHIA | 13 | 16 | 29 |
| HIAC | 9 | 8 | 17 |
| HTOM | 8 | 9 | 17 |
| NAC | 7 | 4 | 11 |
| HBAC | 5 | 6 | 11 |
| HAAC | 4 | 7 | 11 |
| NHNAC | 6 | 3 | 9 |
| HBA | 4 | 3 | 7 |
| HAA | 2 | 5 | 7 |
| HIA | 3 | 3 | 6 |
| NA | 2 | 1 | 3 |
| HNAC | 1 | 1 | 2 |
| HNA | 1 | 1 | 2 |
| NHNA | 1 | 0 | 1 |
• Delaware County population
25.3 mi, 
235°
• Grant County
34.7 mi, 
279°
• Darke County
29.1 mi, 
136°
• Mercer County
20.7 mi, 
70°
• Huntington County
36.8 mi, 
317°
• Adams County
21.8 mi, 
9°
• Van Wert County
36.4 mi, 
36°
• Wells County
23.5 mi, 
332°
• Randolph County
18.7 mi, 
180°
• Blackford County
17 mi, 278°
[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
*Randolph Indiana Notes
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