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Baltimore County Public Schools

Maryland · runs pre-K through grade 12

NCES ID 2400120 · bcps.org · (443) 809-4554

Baltimore County spreads across 57 ZIP Code areas — enough that no single postal code describes it. It is the only district in 29 of them and shares 26 more; in the remaining 2 it holds under half a percent of the homes. In total it covers 350,163 homes over 598 square miles.

A district wide enough to cross many ZIP Codes

The counts below come from the census blocks assigned to Baltimore County, grouped by the ZIP Code area each block falls in. The Census Bureau publishes the blocks; the grouping is computed here, and it is the only place these particular numbers exist.

  • Homes inside the boundary350,163
  • Residents854,535
  • ZIP Code areas it reaches57
  • Where it is the only district29
  • Where it shares with another district26
  • Where it holds under half a percent2
  • Land area598 square miles
  • Homes per square mile585

The ZIP Code areas it reaches

The spread is the thing to notice. In 21117 this district holds 100% of the homes; in 21285 it holds no homes at all. Same district, opposite answers, and a lookup that names it without the share tells the second household the same thing as the first.

  • ZIP Code 21117 · Owings Mills, Maryland100% of the homes
  • ZIP Code 21221 · Essex, Maryland100% of the homes
  • ZIP Code 21220 · Middle River, Maryland100% of the homes
  • ZIP Code 21093 · Timonium, Maryland100% of the homes
  • ZIP Code 21244 · Milford Mill, Maryland100% of the homes
  • ZIP Code 21133 · Randallstown, Maryland100% of the homes
  • ZIP Code 21030 · Cockeysville, Maryland100% of the homes
  • ZIP Code 21286 · Hampton, Maryland100% of the homes
  • ZIP Code 21204 · Towson, Maryland100% of the homes
  • ZIP Code 21128 · Honeygo, Maryland100% of the homes
  • ZIP Code 21219 · Edgemere, Maryland100% of the homes
  • ZIP Code 21131 · Cockeysville, Maryland100% of the homes
  • ZIP Code 21120 · Baltimore County, Maryland100% of the homes
  • ZIP Code 21152 · Baltimore County, Maryland100% of the homes
  • ZIP Code 21162 · Honeygo, Maryland100% of the homes
  • ZIP Code 21057 · Carney, Maryland100% of the homes
  • ZIP Code 21053 · Baltimore County, Maryland100% of the homes
  • ZIP Code 21153 · Pikesville, Maryland100% of the homes
  • ZIP Code 21071 · Baltimore County, Maryland100% of the homes
  • ZIP Code 21052 · Edgemere, Maryland100% of the homes
  • ZIP Code 21051 · Baltimore County, Maryland100% of the homes
  • ZIP Code 21156 · Kingsville, Maryland100% of the homes
  • ZIP Code 21250 · Catonsville, Maryland100% of the homes
  • ZIP Code 21023 · Baltimore County, Maryland100% of the homes
  • ZIP Code 21105 · Baltimore County, Maryland23 of 23 homes
  • ZIP Code 21252 · Towson, Maryland15 of 15 homes
  • ZIP Code 21031 · Cockeysville, Maryland1 of 1 home
  • ZIP Code 21237 · Rosedale, Maryland100% of the homes
  • ZIP Code 21236 · Perry Hall, Maryland100% of the homes
  • ZIP Code 21228 · Catonsville, Maryland99% of the homes
  • ZIP Code 21136 · Reisterstown, Maryland97% of the homes
  • ZIP Code 21227 · Arbutus, Maryland97% of the homes
  • ZIP Code 21222 · Dundalk, Maryland97% of the homes
  • ZIP Code 21082 · Pleasant Hills, Maryland95% of the homes
  • ZIP Code 21208 · Pikesville, Maryland94% of the homes
  • ZIP Code 21155 · Baltimore County, Maryland88% of the homes
  • ZIP Code 21234 · Carney, Maryland87% of the homes
  • ZIP Code 21087 · Kingsville, Maryland85% of the homes
  • ZIP Code 21111 · Baltimore County, Maryland81% of the homes
  • ZIP Code 21207 · Lochearn, Maryland70% of the homes
  • ZIP Code 21013 · Fallston, Maryland68% of the homes
  • ZIP Code 21209 · Baltimore, Maryland53% of the homes
  • ZIP Code 21161 · Harford County, Maryland48% of the homes
  • ZIP Code 21212 · Baltimore, Maryland34% of the homes
  • ZIP Code 21163 · Randallstown, Maryland33% of the homes
  • ZIP Code 21206 · Baltimore, Maryland19% of the homes
  • ZIP Code 21239 · Baltimore, Maryland18% of the homes
  • ZIP Code 21229 · Baltimore, Maryland16% of the homes
  • ZIP Code 21224 · Baltimore, Maryland14% of the homes
  • ZIP Code 21074 · Hampstead, Maryland9.0% of the homes
  • ZIP Code 21210 · Baltimore, Maryland8.8% of the homes
  • ZIP Code 21102 · Manchester, Maryland8.8% of the homes
  • ZIP Code 21215 · Baltimore, Maryland4.3% of the homes
  • ZIP Code 21104 · Eldersburg, Maryland3.6% of the homes
  • ZIP Code 21043 · Ellicott City, Maryland2.8% of the homes
  • ZIP Code 21085 · Joppatowne, Maryland23 homes, under half a percent
  • ZIP Code 21285 · Towson, Marylandno homes at all

What an answer of one district name misses here

Baltimore County is the largest district in 42 ZIP Code areas. Answer with its name alone and the answer misses 19,826 of the 347,039 homes those areas hold — though in 27 of them it holds every home there is. The count is homes, not addresses, and it is the number no lookup prints.

ZIP Code 21207 · Lochearn, Maryland is a two-district area: 14,160 of its 20,214 homes are inside Baltimore County, and the other 6,054 homes are with Baltimore City. Which one an address belongs to is settled by the street, not by the five digits.

In ZIP Code 21209 · Baltimore, Maryland the split runs 6,462 to 5,813 and the larger part is Baltimore County's: the rest is 5,813 homes with Baltimore City.

In ZIP Code 21023 · Baltimore County, Maryland the single-name answer is the true one: Baltimore County holds all 35 homes counted there, and no other district holds a share worth naming.

ZIP Code 21030 · Cockeysville, Maryland is another area where one name covers everything — 11,685 homes, all of them inside Baltimore County.

Baltimore County reaches into ZIP Code 21212 · Baltimore, Maryland with 4,748 of its 14,159 homes, behind Baltimore City. The familiar answer for that area is the other name, and it is wrong for those 4,748 homes.

ZIP Code 21206 · Baltimore, Maryland is another area where Baltimore County is present without being the answer: 4,099 of its 21,311 homes, behind Baltimore City.

Baltimore County is not the name anyone would give for ZIP Code 21215 · Baltimore, Maryland — Baltimore City leads it — and Baltimore County holds 1,106 homes there all the same. Answer that area with one name and that is what it is wrong about.

ZIP Code 21161 · Harford County, Maryland is close to being two districts in equal parts: Baltimore County holds 1,001 of its 2,081 homes and Harford County leads the rest. A lookup that picks the larger name is making a coin-toss look like a fact.

Who takes the other homes in its ZIP Codes

Baltimore County runs pre-K through grade 12 itself, so an address it holds sees no change of authority between grade school and high school. The districts listed below are the ones that take the other homes in the ZIP Code areas it shares — Baltimore City, Howard County and Carroll County. They are neighbors on the same postal ground, not the next stop for its own students.

Who it shares ZIP Codes with

These districts appear alongside Baltimore County in the same ZIP Code areas: Baltimore City, Carroll County, Harford County and Howard County. A single-name lookup for one of those areas has to choose between them, and the choice is right for some addresses and wrong for others.

Baltimore County and Baltimore City school district boundary: the ZIP Codes they share

  • ZIP Code 21206 · Baltimore, Maryland
  • ZIP Code 21207 · Lochearn, Maryland
  • ZIP Code 21208 · Pikesville, Maryland
  • ZIP Code 21209 · Baltimore, Maryland
  • ZIP Code 21210 · Baltimore, Maryland
  • ZIP Code 21212 · Baltimore, Maryland
  • ZIP Code 21215 · Baltimore, Maryland
  • ZIP Code 21222 · Dundalk, Maryland
  • ZIP Code 21224 · Baltimore, Maryland
  • ZIP Code 21227 · Arbutus, Maryland
  • ZIP Code 21228 · Catonsville, Maryland
  • ZIP Code 21229 · Baltimore, Maryland
  • ZIP Code 21234 · Carney, Maryland
  • ZIP Code 21239 · Baltimore, Maryland

Baltimore County and Carroll County school district boundary: the ZIP Codes they share

  • ZIP Code 21074 · Hampstead, Maryland
  • ZIP Code 21102 · Manchester, Maryland
  • ZIP Code 21104 · Eldersburg, Maryland
  • ZIP Code 21136 · Reisterstown, Maryland
  • ZIP Code 21155 · Baltimore County, Maryland

Baltimore County and Harford County school district boundary: the ZIP Codes they share

  • ZIP Code 21013 · Fallston, Maryland
  • ZIP Code 21082 · Pleasant Hills, Maryland
  • ZIP Code 21087 · Kingsville, Maryland
  • ZIP Code 21111 · Baltimore County, Maryland
  • ZIP Code 21161 · Harford County, Maryland

Have a street address?

A ZIP Code names every district that can serve the area; a street address settles which one serves a home. The Census Bureau geocoder takes an exact address and returns its school districts from the current boundary files, free and with no account.

Check an exact address with the Census Geocoder

Where this district sits

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: in 26 of the 57 ZIP Code areas Baltimore County reaches, at least one other district holds a real share of the homes as well, and the line between 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.