The US Census Bureau’s Decennial Census program collects complete counts of US population every 10 years.
1960 | 1970 | 1980 | 1990 | 2000 | 2010 | 2020 | |
Delaware County Population | 553,154 | 603,456 | 555,007 | 547,651 | 550,864 | 558,979 | 576,830 |
Change in population 2010-2020 map
Historical Population Data by Municipality 1790-2020
For more information regarding historic population data, please contact us at 610-891-5200 or Planning_Department@co.delaware.pa.us.