| Sik - Omsk Oblast’ |
Sikerki - Kaluga Oblast (Kaluzhskaya Oblast’) |
Siklya - Tatarstan |
| Sik-Zilga - Bashkortostan |
Sikertan - Tatarstan |
Siklyuk - Chukotka (Chukot [Chukchi]) |
| Sikachi-Alyan - Khabarovsk Krai (Khabarovsk Kray) |
Sikey-U - Yakutia (Sakha) |
Sikopokhya - Karelia |
| Sikala - Karelia |
Sikhanova - Perm Oblast’ |
Sikorin - Yakutia (Sakha) |
| Sikankhoy - Chechnya |
Sikhonkino - Bashkortostan |
Sikovitsy - Pskov Oblast’ |
| Sikar - Dagestan |
Sikhovo - Pskov Oblast’ |
Siktagli - Amur |
| Sikareva - Smolensk Oblast’ |
Sikiya - Tatarstan |
Siktemey - Yakutia (Sakha) |
| Sikarevo - Smolensk Oblast’ |
Sikiyaz - Bashkortostan |
Siktyakh - Yakutia (Sakha) |
| Sikavara - Karelia |
Sikiyaztamak - Chelyabinsk Oblast’ |
Sikuka - Sakhalin Oblast’ |
| Sikerin - Yakutia (Sakha) |
Sikly-Kol - Dagestan |
Sikukagawa - Sakhalin Oblast’ |