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(Links below lead to Quick Facts for Delaware Counties: People, Business & Geography at U.S. Census Bureau.)
| Area | 7/1/2009 | 7/1/2008 | 7/1/2007 | 7/1/2006 | 7/1/2005 | 7/1/2004 | 7/1/2003 | 7/1/2002 | 7/1/2001 | 7/1/2000 | Census 2000 |
| Delaware | 885,122 | 876,211 | 864,896 | 853,022 | 839,906 | 826,639 | 814,905 | 804,131 | 794,620 | 786,411 | 783,600 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Kent County | 157,741 | 155,492 | 152,090 | 148,041 | 143,294 | 138,382 | 134,222 | 131,301 | 128,821 | 127,109 | 126,697 |
| New Castle County | 534,634 | 531,057 | 527,786 | 524,473 | 520,918 | 516,887 | 512,919 | 509,113 | 505,564 | 501,913 | 500,265 |
| Sussex County | 192,747 | 189,662 | 185,020 | 180,508 | 175,694 | 171,370 | 167,764 | 163,717 | 160,235 | 157,389 | 156,638 |
Source: Population Division, U.S. Census Bureau