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IL,(US) - (779) Area Code Interchange Information: (Click on Link for details)

779-200 (ROCKFORD)779-214 (ROCK ISLAND)779-221 (ROCKFORD)
779-222 (JOLIET)779-232 (ARLINGTON HEIGHTS)779-235 (CHICAGO)
779-245 (STERLING)779-279 (NORTHBROOK)779-324 (CHICAGO)
779-348 (ROCKFORD)779-368 (ROCKFORD)779-379 (ELGIN)
779-382 (DEKALB)779-423 (ROCKFORD)779-429 (JOLIET)
779-432 (SHEFFIELD)779-435 (JOLIET)779-444 (CHICAGO)
779-456 (ELGIN)779-475 (MADISON)779-529 (CHICAGO)
779-537 (ROCKFORD)779-545 (DEKALB)779-548 (CHICAGO)
779-552 (CHICAGO)779-696 (MADISON)779-770 (ROCKFORD)
779-771 (ROCKFORD)779-772 (ROCKFORD)779-777 (DEKALB)
779-861 (DIXON)779-875 (AURORA)779-958 (JOLIET)
779-959 (JOLIET)779-999 (JOLIET)