Last official estimated population of Delaware County was 559,026 (year 2014)[1]. This was 0.175% of total US population and 4.4% of total Pennsylvania state population. Area of Delaware County is 190.6 mi² (=493.7 km²), in this year population density was 2,932.93 p/mi². If population growth rate would be same as in period 2010-2014 (+0%/yr), Delaware County population in 2026 would be 559,167 [0].
Historical population of Delaware County for period 1790-2014 [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
[1790-1800] +3.05 %/yr
[1800-1810] +1.41 %/yr
[1810-1820] +0.05 %/yr
[1820-1830] +1.58 %/yr
[1830-1840] +1.34 %/yr
[1840-1850] +2.23 %/yr
[1850-1860] +2.17 %/yr
[1860-1870] +2.56 %/yr
[1870-1880] +3.6 %/yr
[1880-1890] +2.9 %/yr
[1890-1900] +2.41 %/yr
[1900-1910] +2.21 %/yr
[1910-1920] +3.91 %/yr
[1920-1930] +4.94 %/yr
[1930-1940] +1.04 %/yr
[1940-1950] +2.92 %/yr
[1950-1960] +2.93 %/yr
[1960-1970] +0.82 %/yr
[1970-1980] -0.78 %/yr
[1980-1990] -0.13 %/yr
[1990-2000] +0.07 %/yr
[2000-2005] +0.02 %/yr
[2005-2010] +0.25 %/yr
[2010-2014] +0 %/yr
Looking for settlements in Delaware County? Visit this page: Settlements in Delaware County, PA
Population of Delaware County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 17175 | 16566 | 33,741 |
| 5 to 9 | 17473 | 16817 | 34,290 |
| 10 to 14 | 18008 | 17520 | 35,528 |
| 15 to 19 | 20962 | 19892 | 40,854 |
| 20 to 24 | 20125 | 19724 | 39,849 |
| 25 to 29 | 18110 | 18555 | 36,665 |
| 30 to 34 | 17150 | 18091 | 35,241 |
| 35 to 39 | 15766 | 16971 | 32,737 |
| 40 to 44 | 16296 | 17623 | 33,919 |
| 45 to 49 | 18024 | 19439 | 37,463 |
| 50 to 54 | 20045 | 21829 | 41,874 |
| 55 to 59 | 19890 | 21949 | 41,839 |
| 60 to 64 | 16249 | 18008 | 34,257 |
| 65 to 69 | 11905 | 13872 | 25,777 |
| 70 to 74 | 8008 | 10234 | 18,242 |
| 75 to 79 | 5706 | 7978 | 13,684 |
| 80 to 84 | 4694 | 7370 | 12,064 |
| 85+ | 4735 | 10201 | 14,936 |
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 |
| NH | 260203 | 282781 | 542,984 |
| WAC | 198912 | 211040 | 409,952 |
| WA | 194302 | 206011 | 400,313 |
| NHWAC | 191096 | 203626 | 394,722 |
| NHWA | 187103 | 199267 | 386,370 |
| BAC | 58649 | 67984 | 126,633 |
| NHBAC | 56350 | 65451 | 121,801 |
| BA | 55299 | 64207 | 119,506 |
| NHBA | 53505 | 62264 | 115,769 |
| AAC | 16454 | 17739 | 34,193 |
| NHAAC | 16167 | 17444 | 33,611 |
| AA | 14732 | 15877 | 30,609 |
| NHAA | 14587 | 15725 | 30,312 |
| H | 10118 | 9858 | 19,976 |
| HWAC | 7816 | 7414 | 15,230 |
| HWA | 7199 | 6744 | 13,943 |
| TOM | 5345 | 5911 | 11,256 |
| NHTOM | 4626 | 5117 | 9,743 |
| HBAC | 2299 | 2533 | 4,832 |
| IAC | 1881 | 2156 | 4,037 |
| HBA | 1794 | 1943 | 3,737 |
| NHIAC | 1416 | 1685 | 3,101 |
| HTOM | 719 | 794 | 1,513 |
| IA | 522 | 529 | 1,051 |
| HIAC | 465 | 471 | 936 |
| NHIA | 313 | 353 | 666 |
| NAC | 333 | 321 | 654 |
| HAAC | 287 | 295 | 582 |
| NHNAC | 235 | 231 | 466 |
| HIA | 209 | 176 | 385 |
| HAA | 145 | 152 | 297 |
| NA | 121 | 104 | 225 |
| HNAC | 98 | 90 | 188 |
| NHNA | 69 | 55 | 124 |
| HNA | 52 | 49 | 101 |
• Philadelphia County population
15.4 mi, 
65°
• Montgomery County
20.3 mi, 
4°
• Bucks County
32.9 mi, 
27°
• New Castle County
26.9 mi, 
208°
• Camden County
24.5 mi, 
108°
• Chester County
19 mi, 
282°
• Burlington County
39.1 mi, 
94°
• Gloucester County
19 mi, 
134°
• Cecil County
37.8 mi, 
229°
• Salem County
23.8 mi, 
174°
[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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