Diameter estimates of solutions to the \(L_p\) Aleksandrov problem for \(-1<p\le 0\) are established in this paper. As an application, we give a different proof of the existence of solutions to the even \(L_p\) Aleksandrov problem for \(-1<p<0,\) which was obtained by Mui (Adv Math 408:108573, 2022) based on the variational method. We also find that \(p=-1\) is a critical value for this problem by constructing some examples showing that the existence (resp. uniqueness) may fail for general even measures when \(p=-1\) (resp. \(p<-1\) ).