Kazakhstan
males age 16-49: 4,176,731
females age 16-49: 4,219,636 (2008 est.)
Kenya
males age 16-49: 9,044,685
females age 16-49: 8,805,736 (2008 est.)
Kiribati
males age 16-49: 26,377 (2008 est.)
Korea, North
males age 16-49: 6,225,747
females age 16-49: 6,188,270 (2008 est.)
Korea, South
males age 16-49: 13,691,809
females age 16-49: 13,029,859 (2008 est.)
Kuwait
males age 16-49: 1,032,408
females age 16-49: 568,657 (2008 est.)
Kyrgyzstan
males age 16-49: 1,398,878
females age 16-49: 1,419,374 (2008 est.)
Laos
males age 16-49: 1,549,774
females age 16-49: 1,570,702 (2008 est.)
Latvia
males age 16-49: 568,683
females age 16-49: 565,826 (2008 est.)
Lebanon
males age 16-49: 1,106,879
females age 16-49: 1,122,595 (2008 est.)