If you've received a call from a number beginning with 443, or you're considering a local phone presence in Maryland, you're in the right place. The 443 area code is one of three telephone area codes serving eastern Maryland — a region anchored by Baltimore, one of the Mid-Atlantic's most significant business hubs.
Whether you're a business owner looking to establish local credibility in the Baltimore market, a resident researching an unknown caller, or simply curious about Maryland's telephone history, this guide covers everything you need to know: the 443 area code's location, cities, time zone, history, scam call risks, and how to get your own 443 phone number.
The 443 area code is a North American Numbering Plan (NANP) telephone area code assigned to eastern Maryland. It functions as an overlay on the original 410 area code, meaning both codes cover the exact same geographic territory. A third code, 667, was added later to handle continued number demand.
All three codes — 410, 443, and 667 — share the same cities, counties, and time zone, and callers must dial all ten digits for every local call within the region.
The 443 area code location is eastern Maryland. It covers the Baltimore metropolitan area, the state capital of Annapolis, and extends across several surrounding counties — reaching the Eastern Shore and parts of southern Maryland.
The 443 area code spans more than 10 counties, including Baltimore City, Baltimore County, Anne Arundel, Howard, Harford, and Cecil counties, plus the majority of the Eastern Shore counties — Wicomico, Worcester, Somerset, Talbot, Dorchester, Queen Anne's, Kent, and Caroline.
Understanding the history of 443 area code Maryland requires going back to the roots of the state's telephone numbering system.
All numbers with the 443 area code operate on Eastern Time (ET):
Like any active area code, the 443 prefix is regularly exploited by scammers using caller ID spoofing — a technique that displays a local-looking number to increase the chance you'll answer. Common scams tied to 443 numbers include:
A 443 phone number isn't just for Maryland residents — it's a strategic business tool. Here's why companies of all sizes choose to get a 443 area code number:
Customers are far more likely to answer a call from a local area code than from an out-of-state or toll-free number. A 443 number signals that your business is rooted in the community.
A virtual 443 number lets you operate as a Maryland business — handling inbound calls, routing to your team, and displaying a local caller ID — from anywhere in the world. This is especially valuable for remote teams and businesses expanding into the mid-Atlantic market.
A dedicated local number, paired with an auto-attendant, call recording, and voicemail-to-email, projects the professionalism that converts first-time callers into long-term customers.
Getting a 443 number for your business is simple with a modern cloud phone platform:
There is no functional difference. Area codes 443, 410, and 667 are all overlays serving the identical geographic region in eastern Maryland. The distinction is purely administrative — each code was introduced as demand exhausted the previous one. A business with a 410, 443, or 667 number experiences the same coverage and service quality.
The 443 area code is more than a three-digit prefix — it's the identifier for one of the most economically active regions in the Mid-Atlantic. Covering Baltimore, Annapolis, Columbia, and dozens of surrounding communities, it carries the commercial weight of a region that contributes hundreds of billions of dollars to the US economy.