| srl | isir1237 | Isirawa | Greater Kwerba | 12 |
| ian | iatm1242 | Iatmul (Sawos Dialect) | N,
N,
S,
Iatmulic | 18 |
| itx | itik1240 | Itik | T,
Tor | 37 |
| ihp | ihaa1241 | Iha | W,
Nuclear West Bomberai | 41 |
| ian | iatm1242 | Iatmul | N,
N,
S,
Iatmulic | 43 |
| irh | irar1238 | Irarutu | A,
M,
T,
E,
Nabi-Irarutu | 50 |
| nca | iyoo1238 | Iyo | N,
F,
F,
G,
Ufim-Rawa-Nahu | 51 |
| itr | iter1241 | Iteri | L,
W,
Iteri-Bo | 80 |
| itr | iter1241 | Iteri (Rocky Peak Dialect) | L,
W,
Iteri-Bo | 91 |
| iwm | iwam1256 | Iwam | S,
I,
Iwamic | 94 |
| ipi | ipil1240 | Ipili | N,
E,
Engan | 96 |
| meb | mena1240 | Ikobi-Mena | T,
T,
Ikobi | 103 |
| ipo | ipik1244 | Ipiko | A,
Inland Gulf of Papua | 113 |
| ian | iatm1242 | Iatmul (Kanganaman Dialect) | N,
N,
S,
Iatmulic | 129 |
| ian | iatm1242 | Iatmul (Brugnowi Dialect) | N,
N,
S,
Iatmulic | 137 |
| ian | iatm1242 | Iatmul (Korogo Dialect) | N,
N,
S,
Iatmulic | 137 |
| ian | iatm1242 | Iatmul (Tambanam Dialect) | N,
N,
S,
Iatmulic | 139 |
| ind | indo1316 | Indonesian | A,
M,
M,
M,
N,
Standard Malay-Indonesian | 232 |
| ino | inok1238 | Inoke-Yate | N,
K,
G,
N,
S,
Kamano-Yagaria | 252 |
| tmu | iauu1242 | Iau | L,
T,
Central Tariku | 262 |
| isa | isab1240 | Isabi | N,
K,
G,
Unclassified Goroka | 282 |
| igo | iseb1246 | Isebe | N,
M,
C,
M,
G,
Panim-Isebe-Bau | 350 |
