ZIP Codes in Maine
Maine's ZIP codes cover the northeasternmost state in the country, a mix of rocky Atlantic coastline dotted with lobster fishing villages, dense forests covering much of the interior, and a population of around 1.4 million concentrated heavily in the state's southern third. Maine remains one of the most rural states in the country by population density, with vast stretches of its northern and interior counties covered by ZIP codes serving only a handful of small towns.
How ZIP Codes Are Organized Across the State
Maine's ZIP codes fall within the 03900–04999 range under the USPS system. Portland, the state's largest city, and the surrounding southern coastal region occupy the lower-to-mid part of that range around 041xx, Bangor, further north and inland, sits near 044xx, and the more remote northern counties, including Aroostook County near the Canadian border, carry codes toward the upper end around 047xx.
Maine's Major Population Centers
The chart below shows how population concentrates around Portland in the south, with the rest of the state's cities considerably smaller and more spread out.
Portland's ZIP codes cover Maine's largest city and its main economic hub, a working port with a growing food and tourism scene that has drawn significant national attention in recent years. Lewiston and Auburn, twin cities along the Androscoggin River, carry a more traditional New England mill-town history, having grown originally around textile manufacturing. For a broader comparison, our full US ZIP code directory shows how Maine's compact range fits alongside every other state.
The Maine Coast and Lobster Country
Maine's rugged, deeply indented coastline is world-famous for its lobster industry, and ZIP codes along this stretch cover a string of small fishing villages and tourist towns, from Kennebunkport in the south to Bar Harbor near Acadia National Park further Down East. Many of these coastal ZIP codes see dramatic seasonal population swings, with summer tourism far outpacing the year-round resident count.
Northern Maine and Aroostook County
Northern Maine, particularly vast Aroostook County near the Canadian border, is sparsely populated and heavily agricultural, known for potato farming. This region borders the Canadian province of New Brunswick and Quebec, and shares a closer economic and cultural connection with Canada in some respects than with southern Maine, given the sheer distance separating it from Portland. ZIP codes here cover enormous geographic areas relative to their small populations.
Why ZIP Codes Matter Beyond Mail
In Maine, ZIP codes are closely tied to seasonal tourism patterns along the coast, where summer visitor populations can dwarf year-round resident counts in towns like Bar Harbor and Kennebunkport. Real estate listings in these coastal ZIP codes reflect some of the highest property values in the state, driven by vacation-home demand. And Maine's fishing and lobster industry relies on coastal ZIP-level data for licensing and logistics coordination.
Border Regions and Neighboring States
Maine shares a land border with only one US state - New Hampshire to the west - making it geographically isolated from the rest of the country in a way most states aren't. Its much longer border with Canada, both New Brunswick and Quebec, shapes trade and cultural ties in the northern part of the state more than any connection to the rest of New England.
Finding the Right ZIP Code
Use the list below to browse Maine's ZIP codes by city, county, or population - sorted so the most populous areas surface first. Each entry links through to a detailed page with additional demographic data. If you're trying to identify the ZIP code for a specific address rather than browsing by city, the search tool at the top of this page will get you there faster than scrolling through the full list.
Frequently Asked Questions
How many ZIP codes does Maine have?
Maine has around 180 ZIP codes, concentrated most heavily in the southern part of the state around Portland, with far fewer covering the vast, sparsely populated north.
What ZIP code range does Maine use?
Maine ZIP codes generally fall between 03900 and 04999, with southern Maine toward the lower end and Aroostook County in the north further along the range.
Which Maine city has the most ZIP codes?
Portland, as the state's largest city and main economic hub, accounts for the greatest concentration of ZIP codes in southern Maine.
Can I look up a Maine ZIP code by city name?
Yes, use the search tool on this page or browse the full list below, which is organized by city and sorted by population.
Whether you're relocating to the Portland area, researching a coastal property Down East, or simply trying to pin down the right ZIP code for a specific Maine address, the data below covers every corner of the state - from the southern coast to Aroostook County.