P is the primary call number range for subjects in linguistics. P1-PM9021 will cover most aspects of linguistics and langauges.
P Philology and Linguistics
PA Greek and Latin Languages
PB Modern Languages and Celtic Languages
PC Romance Languages
PD Germanic and Scandinavian Languages
PE English Languages
PF West Germanic Languages
PG Slavic, Baltic, and Albanian Languages
PH Uralic and Basque Languages
PJ Oriental Languages
PK Indo-Iranian Languages
PL East Asian and African Languages
PM Hyperborean, Indian, and artificial languages
You might also be interested in the BF309-499 call number range, which includes psycholinguistics.
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