School districts in Idaho
43% of the 278 populated ZIP Code areas in Idaho are served by more than one school district — 120 of them, which puts the state 31st among the fifty-two. It is organized into 116 unified districts, the largest being Boise City Independent School District 1 at 94,294 homes. Its most divided ZIP Code area, 83607, is split between 7 districts for elementary grades alone. The two districts that share the most ZIP Codes here are Meridian Joint School District 2 and Boise City Independent School District 1, in 4 of them. Counted by homes rather than by ZIP Code area, 64% of the state's housing sits in a ZIP Code that more than one district serves.
How often a ZIP Code here crosses a district line
The state is close to the national rate of 53%. Every count below comes from the census blocks in each ZIP Code area rather than from any published table; Boise City Independent School District 1 is the largest district in it, at 94,294 homes.
- ZIP Code areas with a district278
- Served by more than one district120 (43%)
- Grade school and high school differ0 (0%)
- No high school district named0
- Unified districts116
- Elementary districts0
- Secondary districts0
- Homes in no district at all0
The largest districts in Idaho
Ranked by the homes inside their boundaries: Boise City Independent School District 1 leads at 94,294, then Meridian Joint School District 2 and Coeur d'Alene School District 271. Only districts with a page here are linked; 112 more exist in the state without one.
The most divided ZIP Code area in Idaho
ZIP Code area 83607 is the most divided in Idaho: 7 districts reach into its 11,989 homes, led for the early grades by Vallivue School District 139 and Middleton School District 134. No single name describes this postal code, and no lookup that gives one is telling the whole truth about it.
Each percentage here is a share of the 11,989 homes counted in ZIP Code 83607, 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 11,989 homes counted in ZIP Code 83607, so one cell is 343 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.
- Vallivue School District 1396,974 of 11,989 homes58%
- Middleton School District 1342,109 of 11,989 homes18%
- Caldwell School District 1321,932 of 11,989 homes16%
- Notus School District 135362 of 11,989 homes3.0%
- Marsing Joint School District 363219 of 11,989 homes1.8%
- New Plymouth School District 372214 of 11,989 homes1.8%
- Emmett Independent School District 221174 of 11,989 homes1.5%
4 further districts reach into this area and hold 5 homes between them, under half a percent of the homes named at this level each.
For grade school, an answer of one district name would be wrong for 5,015 of the 11,989 here.
How much of Idaho a single district name misses
Across the 278 ZIP Code areas in Idaho with homes in them, an answer of one district name misses 61,050 of the 751,418 homes they hold — 8.1% of the state. In 136 of those areas the single name is the whole truth; in the other 142 it is not.
In ZIP Code 83709 · Boise City, Idaho the largest district for grade school is Meridian Joint School District 2, and naming it alone misses 10,113 of the 21,858 homes counted there. The rest are with Boise City Independent School District 1 and Kuna Joint School District 3.
ZIP Code 83687 · Nampa, Idaho names 4 districts. Nampa School District 131 is the largest of them for grade school, and an answer of its name alone misses 5,809 of the 13,006 homes there; Vallivue School District 139, Kuna Joint School District 3 and Meridian Joint School District 2 hold the rest.
In ZIP Code 83401 · Idaho Falls, Idaho the largest district for grade school is Bonneville Joint School District 93, and naming it alone misses 5,427 of the 15,922 homes counted there. The rest are with Idaho Falls School District 91 and Ririe Joint School District 252.
Where a ZIP Code here names more than one district
Of the 278 ZIP Code areas in Idaho that the federal file names a district for, 120 name more than one school district. These are the 12 with the most, starting at 7 districts in one postal area: Caldwell, Shoshone and Nez Perce County. 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.
- ZIP Code 83607 · Caldwell, Idaho7 districts · 11,989 homes
- ZIP Code 83352 · Shoshone, Idaho4 districts · 1,496 homes
- ZIP Code 83541 · Nez Perce County, Idaho4 districts · 687 homes
- ZIP Code 83660 · Parma, Idaho4 districts · 2,239 homes
- ZIP Code 83676 · Wilder, Idaho4 districts · 1,814 homes
- ZIP Code 83687 · Nampa, Idaho4 districts · 13,006 homes
- ZIP Code 83861 · St. Maries, Idaho4 districts · 3,223 homes
- ZIP Code 83212 · Power County, Idaho3 districts · 74 homes
- ZIP Code 83217 · Bancroft, Idaho3 districts · 361 homes
- ZIP Code 83221 · Fort Hall, Idaho3 districts · 10,084 homes
- ZIP Code 83302 · Twin Falls County, Idaho3 districts · 141 homes
- ZIP Code 83314 · Bliss, Idaho3 districts · 371 homes
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: 120 of the 278 ZIP Code areas in Idaho 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.