A gritty, diverse industrial city on the Illinois border, Hammond is a cornerstone of Northwest Indiana’s “Region” and a part of the greater Chicago metropolitan area. It sits under the 219 area code. This guide covers the 219 area code, its coverage across Lake County, dialing rules, its Chicago-synced Central time, major ZIP codes, and local scam warnings.
Hammond Area Codes at a Glance
| Detail | Information |
|---|---|
| Primary Area Code(s) | 219 |
| Overlay Area Code(s) | None (219 only) |
| Time Zone | Central Time (CT) – CST / CDT |
| Major County | Lake County |
| Region | Northwest Indiana (The Region) |
| Dialing Format | 7 or 10-digit dialing |
Area Code Breakdown & Regional Mapping
219 – Northwest Indiana (Region) Code
Area code 219 once covered all of northern Indiana, but after the 260 and 574 splits it now serves the northwest corner — “the Region” — including Hammond, Gary, Merrillville, and Valparaiso. It covers Hammond and Lake County as a single, non-overlaid area code.
Neighborhoods & Local Coverage
Hammond’s 219 code covers a city woven into the Chicago metro along Lake Michigan. Downtown Hammond and the lakefront Robertsdale neighborhood sit right on the Illinois line, while the Horseshoe (now Hard Rock) casino and the Purdue University Northwest campus anchor much of the city’s economy and student life.
Beyond downtown, the same code reaches the Hessville and Woodmar neighborhoods, the industrial corridors along the lakefront, and the famous house from the movie A Christmas Story, a local landmark. As part of the Region, Hammond shares the 219 code with neighboring Gary and the rest of Northwest Indiana.
Local Dialing Rules, Time Zone & International Format
Because 219 is a single area code with no overlay, Hammond still permits 7-digit dialing for local calls, though 10-digit dialing (area code + number) always works. Just across the state line, Chicago uses codes like 312 and 773 — and shares the same Central Time Zone.
A note on Indiana time: Hammond sits in Indiana’s northwest corner — “the Region” — and runs on Central Time, synced with neighboring Chicago rather than the Eastern Time observed by most of Indiana. The entire 219 area operates on Central Time.
To call Hammond from outside the United States, dial your country’s exit code, then the U.S. country code +1, followed by the 10-digit number (for example, +1 219 XXX-XXXX). From inside the U.S. and Canada, simply dial 1 before the 10-digit number for long-distance calls.
Major ZIP Codes Covered
The 219 service area spans many of Hammond’s core ZIP codes, including 46320, 46323, 46324, and 46327.
Spam & Scam Call Warnings in Hammond
Hammond residents report spoofed 219 robocalls impersonating utilities like NIPSCO, the IRS, and delivery services. Cross-border and casino-related scams, along with fake-warranty robocalls, are also common across the Region.
| Scam Type | What to Watch For |
|---|---|
| Neighbor Spoofing | Calls that mimic a local 219 prefix to look familiar. |
| Utility / Toll Scams | Threats to shut off power or demand toll payment via gift cards. |
| IRS / Government | Robocalls claiming legal action — agencies never call to demand instant payment. |
Red flag: Any caller who pressures you to pay immediately with gift cards, wire transfers, or cryptocurrency is almost certainly running a scam. Hang up and verify through an official number.
↑ See the complete list of All US Area Codes by State for every code across the country.
Nearby & Related Indiana Cities
Frequently Asked Questions
What area code is Hammond, IN?
Hammond uses area code 219, which covers Lake County and Northwest Indiana’s Region.
What time zone is Hammond in?
Hammond is in the Central Time Zone (CST/CDT), synced with Chicago, unlike most of Indiana, which is on Eastern Time.
Does Hammond have the same area code as Gary?
Yes. Hammond and Gary, along with the rest of Northwest Indiana’s Region, all use the 219 area code.
Do I have to dial 10 digits in Hammond?
Not necessarily. Because 219 has no overlay, 7-digit local dialing still works, but 10-digit dialing is always accepted.
Stay Safe & Explore More
- Verify an unknown caller in our Scam Alerts directory.
- Comparing nationwide numbers? See our Toll-Free Numbers guides.