Area Code 312

Illinois (IL) • Chicago • Central Time (CT)

What Stands Out

•Coverage: 300.9K people across 13 ZIP codes (primarily Cook County, IL).
•Overlapping area codes: 872.
•Major cities: Chicago.

Spotlight: Coverage

Snapshot highlights for area code 312.

Income

85th

Home values

86th

Poverty rate

61st

Area Code Basics

Primary State

Illinois (IL)

States Served

Illinois (IL)

Major Cities

Chicago

Time Zone(s)

Central Time (CT)

Est. Population

300.9K

ZIP Codes

Data accuracy & methodology

This report aggregates 2020–2024 ACS 5-year estimates and geographic overlays for orientation. Area-code service areas can cross ZIP/state boundaries and change over time; verify official assignments with NANPA for critical use.