312-200 Prefix — Chicgozn01, Illinois

Phone numbers starting with 312-200 are based in Chicgozn01, Illinois, primarily served by Metro By T-Mobile.

Recently looked-up numbers in 312-200

• 312-200-7906
• 312-200-8803

More about this region

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

Last updated: May 14, 2026