| 216565 | Saponi | muɾɛ | | | Clouse (1997) | |
| 125787 | Saruga | ivʌ | | | Z'graggen (1980) | straight |
| 181630 | Sausi | naʔon | | | Z'graggen (1980) | straight |
| 158034 | Selepet | tɔŋtɔŋ | | | McElhanon and Voorhoeve (1970) | straight |
| 157964 | Sempan | iwato | | | McElhanon and Voorhoeve (1970) | straight |
| 158041 | Sene | dɔndɔne | | | McElhanon and Voorhoeve (1970) | straight |
| 158024 | Sialum | kɔŋtɛne | | | McElhanon and Voorhoeve (1970) | straight |
| 125776 | Sihan | tutu | | | Z'graggen (1980) | straight |
| 216580 | Sikaritai | ug̚kwakwɛ | | | Clouse (1997) | |
| 193845 | Sileibi | turusɨmba | | | Z'graggen (1980) | straight |
| 125794 | Silopi | orovʌk | | | Z'graggen (1980) | straight |
| 259792 | Sinaugoro | roroɣoto | | | Dutton (1970) | straight |
| 181628 | Sinsauru | denu- | | | Z'graggen (1980) | straight |
| 181635 | Siroi | tiŋ(no) | | | Z'graggen (1980) | straight |
| 213872 | Som | tʌrʌrʌŋi | ŋ is fronted before [i] | | SIL (1968) | |
| 158004 | Som | tʌrʌrʌ | | | McElhanon and Voorhoeve (1970) | straight |
| 158029 | Somba-Siawari (Burum Dialect) | dindiŋi | | | McElhanon and Voorhoeve (1970) | straight |
| 158030 | Somba-Siawari (Mindik Dialect) | dindiŋi | | | McElhanon and Voorhoeve (1970) | straight |
| 181640 | Sop | sulul | | | Z'graggen (1980) | straight |
| 157983 | Southern Kiwai | kawitato | | | McElhanon and Voorhoeve (1970) | straight |
| 181641 | Sumau | tuku | | | Z'graggen (1980) | straight |
| 216569 | Tause | ɸɛtide | | | Clouse (1997) | |
| 216568 | Tause (Deirate Dialect) | kwidaka | | | Clouse (1997) | |
| 193859 | Tauya | tiʔepia | | | Z'graggen (1980) | straight |
| 157977 | Telefol | tool-kub | | | McElhanon and Voorhoeve (1970) | straight |
| 157976 | Tifal | tool-kub | | | McElhanon and Voorhoeve (1970) | straight |
| 158033 | Timbe | tɔŋ | | | McElhanon and Voorhoeve (1970) | straight |
| 158031 | Tobo | dindiŋa | | | McElhanon and Voorhoeve (1970) | straight |
| 158010 | Tuma-Irumu (Irumu Dialect) | siwɔŋi | | | McElhanon and Voorhoeve (1970) | straight |
| 259788 | Uare | duˈduɣa | | | Dutton (1970) | straight |
| 157992 | Ufim | umbumaŋ | | | McElhanon and Voorhoeve (1970) | straight |
| 144607 | Ukuriguma | tasigum | | | Z'graggen (1980) | straight |
| 158012 | Uri | didimɛ | | | McElhanon and Voorhoeve (1970) | straight |
| 181642 | Urigina | sururub | | | Z'graggen (1980) | straight |
| 144602 | Usan | orogɛn | | | Z'graggen (1980) | straight |
| 193847 | Utarmbung | rtɛ- | | | Z'graggen (1980) | straight |
| 125795 | Utu | fɛfɛral | | | Z'graggen (1980) | straight |
| 181644 | Uya | tutugu | | | Z'graggen (1980) | straight |
| 181646 | Uyajitaya | tikini | | | Z'graggen (1980) | straight |
| 157984 | Waboda | karawasemi | | | McElhanon and Voorhoeve (1970) | straight |
| 193851 | Wadaginam | tɨpita- | | | Z'graggen (1980) | straight |
| 125802 | Wagi | mangu | | | Z'graggen (1980) | staright |
| 125784 | Wamas | mua | | | Z'graggen (1980) | straight |
| 157973 | Wambon | yani | | | McElhanon and Voorhoeve (1970) | straight |
| 144599 | Wanambre | bɛtɛwɛt | | | Z'graggen (1980) | straight |
| 158009 | Wantoat | dudumnə | | | McElhanon and Voorhoeve (1970) | straight |
| 216575 | Waritai | tutɛ | | | Clouse (1997) | |
| 144586 | Waskia | diːr̃am | | | Z'graggen (1980) | straight |
| 181632 | Watiwa | seta a | | | Z'graggen (1980) | straight |
| 181647 | Waube | tikini | | | Z'graggen (1980) | straight |
