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School districts in Maryland

16% of the 469 populated ZIP Code areas in Maryland are served by more than one school district — 74 of them, which puts the state 45th among the fifty-two. It is organized into 24 unified districts, the largest being Montgomery County at 404,423 homes. Its most divided ZIP Code area, 21771, is split between 4 districts for elementary grades alone. The two districts that share the most ZIP Codes here are Baltimore County and Baltimore City, in 14 of them. Counted by homes rather than by ZIP Code area, 22% of the state's housing sits in a ZIP Code that more than one district serves.

How many school districts are in Maryland?

24: the Census boundary file draws 24 school districts in Maryland that reach at least one ZIP Code area with homes, 24 unified, 0 elementary and 0 secondary. A ZIP Code here can sit in more than one of them, which is why a school district lookup by ZIP Code for Maryland lists them all: find your school district by ZIP code.

How often a ZIP Code here crosses a district line

The state sits well below the national rate of 53%. Montgomery County alone covers 404,423 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: 74 of the 469 do.

  • ZIP Code areas with a district469
  • Served by more than one district74 (16%)
  • Grade school and high school differ0 (0%)
  • No high school district named0
  • Unified districts24
  • Elementary districts0
  • Secondary districts0
  • Homes in no district at all0

District pages for Maryland, largest first

The top of this list is flat: Montgomery County, Prince George's County and Baltimore County hold 404,423, 359,957 and 350,163 homes, so the third is within 14% of the first. Where districts are this evenly matched, size alone says little about which one a ZIP Code area belongs to.

The most divided ZIP Code area in Maryland

ZIP Code area 21771 holds 10,942 homes, and 4 districts each take a meaningful share of them for elementary grades — Frederick County first at 45%, then Carroll County. A lookup that names the first is describing that share of the homes and silently not the 6,058 homes that remain.

Grade schoolFrederick County Public Schools45%4,884 of 10,942 homes
High schoolFrederick County Public Schools45%4,884 of 10,942 homes

Each percentage here is a share of the 10,942 homes counted in ZIP Code 21771, 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 10,942 homes counted in ZIP Code 21771, so one cell is 313 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.

For grade school, an answer of one district name would be wrong for 6,058 of the 10,942 here.

Where a single district name still works in Maryland

Across the 469 ZIP Code areas in Maryland with homes in them, an answer of one district name misses 76,354 of the 2,530,673 homes they hold. That is 3.0% of the state, and in 389 of the areas the largest district for the early grades holds every home counted: this is a state where the familiar answer is usually the right one, and the areas below are where it is not.

ZIP Code 21771 · Green Valley, Maryland names 4 districts. Frederick County is the largest of them for grade school, and an answer of its name alone misses 6,058 of the 10,942 homes there; for grade school the rest is 6,058 homes with Carroll County, Howard County and Montgomery County.

In ZIP Code 21207 · Lochearn, Maryland the largest district for grade school is Baltimore County, and naming it alone misses 6,054 of the 20,214 homes counted there. For grade school the rest is 6,054 homes with Baltimore City.

In ZIP Code 21225 · Brooklyn Park, Maryland the largest district for grade school is Baltimore City, and naming it alone misses 5,926 of the 13,658 homes counted there. For grade school the rest is 5,926 homes with Anne Arundel County.

Where a ZIP Code here names more than one district

Of the 469 ZIP Code areas in Maryland that the federal file names a district for, 74 name more than one school district. These are the 12 with the most, starting at 4 districts in one postal area: Green Valley, Eldersburg and Queen Anne. 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: look on its site for a school locator, a find my school tool or an attendance zone map, or call the office.

A ZIP Code is a set of mail delivery routes, not a boundary: 74 of the 469 ZIP Code areas in Maryland 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.

District websites and phone numbers here come from the NCES Common Core of Data directory, 2024-25 school year, filed under the same district ID as the Census boundary files. Where it lists no usable website, none is printed rather than guessed.

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.

Where these numbers come from

The homes were counted in the 2020 Census and the district lines are the 2026 boundary file, so a fast-growing area may have changed since; ZIP Codes here are the Census Bureau's ZIP Code Tabulation Areas; a share is a share of homes, not the chance that one address is in a district; and a district is not a school attendance zone. Every source, file and caveat is on the method page.