According to police statistics, Kiambu is among counties leading in cases of fathers and brothers increasingly defiling girls in families and women killing their newborns.
The 2015 annual crime report shows a 40 per cent increase in the number of incest cases.
The number of women committing infanticide increased to 55 per cent.
According to the report to be officially released by Inspector-General of Police Joseph Boinnet, other morality crimes that saw an increase were defilement, sodomy, bestiality, bigamy, abduction and indecent assault.
Though the report, which derives the figures from complaints filed at police stations indicates that the number of rape cases have reduced, morality crime involving family members recorded a high.
Nakuru, Bungoma, Kilifi, Nairobi, Kakamega and Mombasa also recorded high numbers of morality offences.
Isiolo, Mandera, Wajir, Samburu and Marsabit had the lowest number of morality cases.