DistrictByZip Every school district that touches your ZIP Code

School districts in Maine

29% of the 426 populated ZIP Code areas in Maine are served by more than one school district — 123 of them, which puts the state 39th among the fifty-two. It is organized into 248 unified districts, 12 elementary districts and 3 secondary districts, the largest being Portland at 35,747 homes. Its most divided ZIP Code area, 04605, is split between 7 districts for elementary grades alone. In 17 of them the answer for grade school is not the answer for high school. The two districts that share the most ZIP Codes here are Hancock Unorganized Territory and Regional School Unit 24, in 4 of them.

How often a ZIP Code here crosses a district line

The state sits well below the national rate of 53%. Portland alone covers 35,747 homes, and districts that size swallow whole postal areas rather than splitting them. Where a ZIP Code area here does cross a line, it is worth checking precisely because it is unusual.

  • ZIP Code areas with a district426
  • Served by more than one district123 (29%)
  • Grade school and high school differ17 (4.0%)
  • No high school district named2
  • Unified districts248
  • Elementary districts12
  • Secondary districts3
  • Homes in no district at all0

The largest districts in Maine

Ranked by the homes inside their boundaries: Portland leads at 35,747, then Lewiston and Bangor. Only districts with a page here are linked; 262 more exist in the state without one.

The most divided ZIP Code area in Maine

ZIP Code area 04605 is the most divided in Maine: 7 districts reach into its 8,390 homes, led for the early grades by Ellsworth and Lamoine. No single name describes this postal code, and no lookup that gives one is telling the whole truth about it.

Grade schoolEllsworth Public Schools55%4,584 of 8,390 homes
High schoolEllsworth Public Schools55%4,584 of 8,390 homes

Each percentage here is a share of the 8,390 homes counted in ZIP Code 04605, not the chance that any one address is in that district. Enrollment follows the street: two houses on opposite sides of the same road can be in different districts, and only the district office can say which.

Every track below is 35 cells long and stands for all 8,390 homes counted in ZIP Code 04605, so one cell is 240 homes, rounded to the nearest whole cell. Cells lit solid are the homes one district holds, and the unlit cells are the homes held by the other districts in the same list.

  • Ellsworth Public Schools4,584 of 8,390 homes55%
  • Lamoine Public Schools1,067 of 8,390 homes13%
  • Trenton1,066 of 8,390 homes13%
  • Otis740 of 8,390 homes8.8%
  • Regional School Unit 24611 of 8,390 homes7.3%
  • Airline Community School District197 of 8,390 homes2.3%
  • Hancock Unorganized Territory100 of 8,390 homes1.2%

One further district reaches into this area and holds 25 homes in it, under half a percent of the homes named at this level.

For grade school, an answer of one district name would be wrong for 3,806 of the 8,390 here.

Where a single district name still works in Maine

Across the 426 ZIP Code areas in Maine with homes in them, an answer of one district name misses 47,643 of the 738,204 homes they hold. That is 6.5% of the state, and in 303 of the areas one name covers everything: this is a state where the familiar answer is usually the right one, and the areas below are where it is not.

ZIP Code 04401 · Bangor, Maine names 4 districts. Bangor is the largest of them for grade school, and an answer of its name alone misses 5,494 of the 21,394 homes there; Hermon, Glenburn and Veazie hold the rest.

In ZIP Code 04901 · Waterville, Maine the largest district for grade school is Waterville, and naming it alone misses 5,045 of the 12,453 homes counted there. The rest are with Winslow and School Administrative District 49.

ZIP Code 04605 · Ellsworth, Maine names 7 districts. Ellsworth is the largest of them for grade school, and an answer of its name alone misses 3,806 of the 8,390 homes there; Lamoine, Trenton and Otis hold the rest.

Where a ZIP Code here names more than one district

Of the 426 ZIP Code areas in Maine that the federal file names a district for, 123 name more than one school district. These are the 12 with the most, starting at 7 districts in one postal area: Ellsworth, Old Town and Wellington. Each row opens the full answer for that ZIP Code, with every district named for grade school and for high school and the share of the homes each one holds.

What to do next

Ask the district office to confirm your street address. A district settles that question on its own site: look for a school locator, a find my school tool, or an attendance zone map. Where there is none, ask the office itself.

A ZIP Code is a set of mail delivery routes, not a boundary: 123 of the 426 ZIP Code areas in Maine with a district named for them are served by more than one school district, and the line between two of them runs along streets. Only the district can say which side of that line an address is on.

This site links to no district website. None of the federal files it is built from publishes one, and a guessed address is worse than none. It is the district office, not a search engine, that settles an address.

If a house purchase depends on the answer, ask the district itself for written confirmation of that exact address. A listing is not a district record, and neither is this page.

What this cannot tell you

The homes were counted in the 2020 Census and the district lines are the 2026 boundary file. Nothing on this page adjusts one to the other. Where houses have been built or cleared since the count, a share here describes the place as it was counted rather than as it stands today, and in the fastest-growing ZIP Code areas that gap is the largest single source of error on this site.

A share on this page is a share of the homes in the ZIP Code area, not a probability for any particular address. Enrollment is decided by street address, and a district may run magnet, charter or choice programs that ignore the boundary entirely. If a decision depends on the answer, the district office is the only authority; this page shows what the federal boundary files say and when they were published.

A district boundary is not a school attendance zone. This site never says which school an address is assigned to: no current national dataset of attendance zones exists, and the district draws them itself. Nor is anything here endorsed or certified by the Census Bureau; we use their published files, and that is the whole of the relationship.

A ZIP Code is a set of mail delivery routes, not an area. What is mapped here is the Census Bureau's ZIP Code Tabulation Area, the closest published approximation to it. The two are not identical, and a handful of ZIP Codes used only for post office boxes or single buildings have no tabulation area at all.

Where these numbers come from

School district boundaries come from the Census Bureau's Census Geographic Relationship File, current 2026 vintage, which assigns every census block to a unified district or to an elementary and a secondary district. Homes and residents in each block come from the 2020 Census Redistricting Data (PL 94-171), H1_001 and P1_001. The ZIP Code areas come from the same Geographic Relationship File, block to ZIP Code Tabulation Area. District names and grade ranges come from the Census Gazetteer 2025, with 2020 for districts no longer listed.

The place name printed beside a ZIP Code comes from the Census 2020 ZIP Code Tabulation Area relationship files: place, county subdivision and county, taken 2026-09-06. It is a label rather than a measurement: the Census Bureau does not publish which post office a ZIP Code belongs to, so the place named is the one covering the most land inside the area, not the city the Postal Service prints on an envelope.

Everything else on this page — the shares, the counts of districts per ZIP, the comparison between the two grade bands, the rankings — is computed here from those files. The source publishes none of it. Snapshot taken 2026-09-03.