312-527 Prefix — Chicgozn01, Illinois

Phone numbers starting with 312-527 are based in Chicgozn01, Illinois, primarily served by Rcn Telecom Services Of Illino.

Recently looked-up numbers in 312-527

• 312-527-5600

More about this region

Area code 312 directory · About area code 312 · Get a IL phone number

Last updated: July 8, 2026