Last official estimated population of DeKalb County was 42,254 (year 2014)[1]. This was 0.013% of total US population and 0.6% of total Indiana state population. Area of DeKalb County is 363.9 mi² (=942.4 km²), in this year population density was 116.13 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), DeKalb County population in 2025 would be 42,339 [0].
Historical population of DeKalb 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] +15.41 %/yr
[1850-1860] +5.34 %/yr
[1860-1870] +2.15 %/yr
[1870-1880] +1.65 %/yr
[1880-1890] +1.86 %/yr
[1890-1900] +0.56 %/yr
[1900-1910] -0.26 %/yr
[1910-1920] +0.22 %/yr
[1920-1930] -0.27 %/yr
[1930-1940] -0.06 %/yr
[1940-1950] +0.5 %/yr
[1950-1960] +0.83 %/yr
[1960-1970] +0.87 %/yr
[1970-1980] +0.86 %/yr
[1980-1990] +0.5 %/yr
[1990-2000] +1.33 %/yr
[2000-2005] +0.58 %/yr
[2005-2010] +0.35 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in DeKalb County? Visit this page: Settlements in DeKalb County, IN
Population of DeKalb County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1325 | 1217 | 2,542 |
| 5 to 9 | 1456 | 1442 | 2,898 |
| 10 to 14 | 1569 | 1472 | 3,041 |
| 15 to 19 | 1562 | 1417 | 2,979 |
| 20 to 24 | 1308 | 1336 | 2,644 |
| 25 to 29 | 1205 | 1211 | 2,416 |
| 30 to 34 | 1178 | 1266 | 2,444 |
| 35 to 39 | 1371 | 1216 | 2,587 |
| 40 to 44 | 1375 | 1363 | 2,738 |
| 45 to 49 | 1473 | 1384 | 2,857 |
| 50 to 54 | 1640 | 1621 | 3,261 |
| 55 to 59 | 1543 | 1511 | 3,054 |
| 60 to 64 | 1299 | 1339 | 2,638 |
| 65 to 69 | 1049 | 1073 | 2,122 |
| 70 to 74 | 702 | 808 | 1,510 |
| 75 to 79 | 466 | 593 | 1,059 |
| 80 to 84 | 299 | 473 | 772 |
| 85+ | 267 | 554 | 821 |
DeKalb 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 | 20755 | 20992 | 41,747 |
| WA | 20535 | 20788 | 41,323 |
| NH | 20511 | 20747 | 41,258 |
| NHWAC | 20214 | 20483 | 40,697 |
| NHWA | 20021 | 20305 | 40,326 |
| H | 576 | 549 | 1,125 |
| HWAC | 541 | 509 | 1,050 |
| HWA | 514 | 483 | 997 |
| BAC | 235 | 206 | 441 |
| TOM | 227 | 213 | 440 |
| NHBAC | 202 | 184 | 386 |
| NHTOM | 199 | 185 | 384 |
| AAC | 184 | 161 | 345 |
| NHAAC | 177 | 146 | 323 |
| IAC | 133 | 132 | 265 |
| AA | 138 | 118 | 256 |
| NHAA | 134 | 109 | 243 |
| BA | 120 | 108 | 228 |
| NHIAC | 108 | 104 | 212 |
| NHBA | 103 | 95 | 198 |
| IA | 58 | 58 | 116 |
| NHIA | 45 | 43 | 88 |
| HTOM | 28 | 28 | 56 |
| HBAC | 33 | 22 | 55 |
| HIAC | 25 | 28 | 53 |
| NAC | 17 | 21 | 38 |
| NHNAC | 17 | 18 | 35 |
| HBA | 17 | 13 | 30 |
| HIA | 13 | 15 | 28 |
| HAAC | 7 | 15 | 22 |
| NA | 9 | 11 | 20 |
| NHNA | 9 | 10 | 19 |
| HAA | 4 | 9 | 13 |
| HNAC | 0 | 3 | 3 |
| HNA | 0 | 1 | 1 |
• Allen County population
21.7 mi, 
189°
• Noble County
21.6 mi, 
270°
• Hillsdale County
37 mi, 
29°
• Branch County
35.9 mi, 
354°
• Defiance County
27.2 mi, 
101°
• Williams County
24.3 mi, 
62°
• LaGrange County
27.6 mi, 
307°
• Steuben County
16.7 mi, 
359°
• Whitley County
31.8 mi, 
234°
• Paulding County
29.2 mi, 
131°
[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
*Allen, Elkhart Indiana Notes
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