Area code 603
Area code 603 serves Manchester and nearby parts of New Hampshire, including Nashua, Concord and Derry. It is on Eastern Time, which observes daylight saving time.
Area code 603 at a glance
| State | New Hampshire (NH) |
| Main city | Manchester |
| Time zone | Eastern Time |
| UTC offset | UTC−5 in winter, UTC−4 in summer |
| Daylight saving time | Yes |
Cities in 603
- Manchester
- Nashua
- Concord
- Derry
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 603 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 603 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 603 between |
|---|---|
| Eastern | 8:00 AM to 9:00 PM |
| Central | 7:00 AM to 8:00 PM |
| Mountain | 6:00 AM to 7:00 PM |
| Arizona | 5:00 AM to 6:00 PM |
| Pacific | 5:00 AM to 6:00 PM |
See the time in 603 without leaving your CRM
Parse is a free Chrome extension that shows the local time and weather beside every phone number on the page.
Other area codes in New Hampshire
603 is the only area code in our list for New Hampshire.
Questions about 603
What time zone is area code 603?
Area code 603 is on Eastern Time. It observes daylight saving time.
Where is area code 603?
Area code 603 is in New Hampshire. Its main city is Manchester, and it also covers Nashua, Concord and Derry.
What are the legal hours to call a 603 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.