ZIP Code 04538

04538 is one of Maine's ZIP codes, delivering to addresses in Boothbay Harbor, Lincoln County.

City: Boothbay Harbor
County: Lincoln County
State: Maine
Prefix: 045xx

Where this code sits

04538 is part of the 045xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Boothbay Harbor.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 04538 delivers to without sharing its boundary.

207 Area code 207

ZIP codes nearest 04538

The ZIP codes whose reference points sit closest to 04538.
ZIP code	Distance	Delivers to
ZIP code 04575	0.8 mi	West Boothbay Harbor, ME
ZIP code 04544	2.4 mi	East Boothbay, ME
ZIP code 04576	2.8 mi	Southport, ME
ZIP code 04537	3.0 mi	Boothbay, ME
ZIP code 04571	3.4 mi	Trevett, ME
ZIP code 04568	3.5 mi	South Bristol, ME
ZIP code 04558	5.7 mi	Pemaquid, ME
ZIP code 04554	6.0 mi	New Harbor, ME

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 04538, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 04538. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.