Westernport Maryland Area Codes
3 area codes cover Westernport: 227, 240 and 301. A number carrying any of them is local to Westernport.
The codes covering Westernport
| Area code | Primarily serves | Shares ground with | In service |
|---|---|---|---|
| 227 | Baltimore | 240, 301 | 2023 |
| 240 | Baltimore | 227, 301 | 1997 |
| 301 | Baltimore | 227, 240 | 1947 |
A code in the “shares ground” column is an overlay: it covers the same territory rather than a different part of Westernport, which is why local calls there are dialled as ten digits.
Scope the codes matched to Westernport. Source geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot) and LocalCallingGuide NPA list (2026-07 NPA list). Updated . Overlay relationships come from the numbering-plan authority; the place match is computed.
Which part of town has which code
We do not publish which of these codes covers which street or neighbourhood in Westernport, and we would rather say so than guess. Area codes are drawn around telephone rate centres, which follow neither municipal boundaries nor ZIP codes, and the per-ZIP telephone data we hold is a 2018 snapshot too noisy to split a city with. Where these codes overlay one another the question has no answer at all: they cover the same ground by design. Awaiting a current, clean-rights rate-centre boundary source.
ZIP codes for the same city
Postal geography is organised separately from telephone geography, so Westernport’s 1 ZIP code do not map onto the codes above. They are listed in full, with the county each falls in, on the postal side of the site.
Westernport Maryland ZIP codes →
Nearby places with different codes
These are the closest places to Westernport whose area codes are not the same set. If you are near one of them, a local number may carry a code that is not on the list above.
| City | Distance | Their area codes |
|---|---|---|
| Union Bridge Maryland area codes | 100 mi | 410, 443, 667 |
| Taneytown Maryland area codes | 100 mi | 410, 443, 667 |
| Mount Airy Maryland area codes | 101 mi | 227, 240, 301, 410, 443, 667 |
| New Windsor Maryland area codes | 104 mi | 410, 443, 667 |
| Westminster Maryland area codes | 109 mi | 410, 443, 667 |
| Sykesville Maryland area codes | 111 mi | 410, 443, 667 |
| Manchester Maryland area codes | 115 mi | 410, 443, 667 |
| Hampstead Maryland area codes | 117 mi | 410, 443, 667 |
Straight-line distance between place reference points, not driving distance.