Last official estimated population of Delaware County was 17,772 (year 2014)[1]. This was 0.006% of total US population and 0.6% of total Iowa state population. Area of Delaware County is 578.9 mi² (=1499.5 km²), in this year population density was 30.70 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Delaware County population in 2025 would be 17,794 [0].
Historical population of Delaware 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] +26.47 %/yr
[1850-1860] +20.15 %/yr
[1860-1870] +4.69 %/yr
[1870-1880] +0.29 %/yr
[1880-1890] -0.34 %/yr
[1890-1900] +1.01 %/yr
[1900-1910] -0.7 %/yr
[1910-1920] +0.16 %/yr
[1920-1930] -0.03 %/yr
[1930-1940] +0.2 %/yr
[1940-1950] -0.41 %/yr
[1950-1960] +0.41 %/yr
[1960-1970] +0.15 %/yr
[1970-1980] +0.09 %/yr
[1980-1990] -0.48 %/yr
[1990-2000] +0.21 %/yr
[2000-2005] -0.51 %/yr
[2005-2010] -0.21 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Delaware County? Visit this page: Settlements in Delaware County, IA
Population of Delaware County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 537 | 449 | 986 |
| 5 to 9 | 606 | 567 | 1,173 |
| 10 to 14 | 619 | 591 | 1,210 |
| 15 to 19 | 575 | 609 | 1,184 |
| 20 to 24 | 471 | 475 | 946 |
| 25 to 29 | 354 | 352 | 706 |
| 30 to 34 | 507 | 483 | 990 |
| 35 to 39 | 457 | 451 | 908 |
| 40 to 44 | 491 | 485 | 976 |
| 45 to 49 | 565 | 535 | 1,100 |
| 50 to 54 | 729 | 755 | 1,484 |
| 55 to 59 | 761 | 680 | 1,441 |
| 60 to 64 | 575 | 576 | 1,151 |
| 65 to 69 | 447 | 425 | 872 |
| 70 to 74 | 332 | 374 | 706 |
| 75 to 79 | 289 | 320 | 609 |
| 80 to 84 | 185 | 254 | 439 |
| 85+ | 192 | 325 | 517 |
Delaware 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 | 8611 | 8622 | 17,233 |
| NH | 8580 | 8621 | 17,201 |
| WA | 8553 | 8559 | 17,112 |
| NHWAC | 8506 | 8545 | 17,051 |
| NHWA | 8452 | 8488 | 16,940 |
| H | 112 | 85 | 197 |
| HWAC | 105 | 77 | 182 |
| HWA | 101 | 71 | 172 |
| BAC | 73 | 66 | 139 |
| NHBAC | 67 | 63 | 130 |
| TOM | 60 | 65 | 125 |
| NHTOM | 56 | 59 | 115 |
| AAC | 31 | 49 | 80 |
| BA | 45 | 33 | 78 |
| NHBA | 42 | 31 | 73 |
| NHAAC | 29 | 44 | 73 |
| IAC | 33 | 30 | 63 |
| NHIAC | 30 | 26 | 56 |
| AA | 21 | 35 | 56 |
| NHAA | 19 | 33 | 52 |
| IA | 13 | 12 | 25 |
| NHIA | 11 | 10 | 21 |
| HTOM | 4 | 6 | 10 |
| HBAC | 6 | 3 | 9 |
| NAC | 5 | 4 | 9 |
| NHNAC | 5 | 2 | 7 |
| HIAC | 3 | 4 | 7 |
| HAAC | 2 | 5 | 7 |
| HBA | 3 | 2 | 5 |
| HIA | 2 | 2 | 4 |
| HAA | 2 | 2 | 4 |
| HNAC | 0 | 2 | 2 |
| HNA | 0 | 2 | 2 |
| NA | 0 | 2 | 2 |
| NHNA | 0 | 0 | 0 |
• Linn County population
29.7 mi, 
203°
• Black Hawk County
48 mi, 
269°
• Dubuque County
24.9 mi, 
91°
• Grant County
43.8 mi, 
51°
• Benton County
44 mi, 
233°
• Buchanan County
24 mi, 269°
• Fayette County
36.2 mi, 
318°
• Jones County
27.2 mi, 
152°
• Jackson County
45.7 mi, 
117°
• Clayton County
25.5 mi, 
4°
[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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