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|| 1998 || style="text-align:center;"|805,235 || style="text-align:center;"| 95%
|- style="text-align:center;"
|| 2011 || style="text-align:center;"|1,151,868|| style="text-align:center;"| 100%
|| 2009 (est.)|| style="text-align:center;"| 1,210,000<ref name="cda.gov.pk">{{cite web|url=http://www.cda.gov.pk/cda-latest/files/news.asp?var=27 |title=Capital Development Authority |publisher=Cda.gov.pk |date=2008-02-09 |accessdate=2012-01-15}}</ref><ref name="dawn.com/wps">http://www.dawn.com/wps/wcm/connect/dawn-content-library/dawn/the-newspaper/editorial/poor-police-performance-460</ref> || style="text-align:center;"| Not available
|- style="text-align:center;"
|| 2011 || style="text-align:center;"| 1,700,000<ref name="dawn.com">{{cite web|url=http://www.dawn.com/2011/04/23/islamabads-population-surges.html |title=Islamabad`s population surges | Provinces |publisher=Dawn.Com |date=2011-04-23 |accessdate=2012-01-15}}</ref>
|-
| colspan=3|
|