Nampa School District 131

It never has a ZIP Code to itself

The counts below come from the census blocks assigned to Nampa School District 131, 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 boundary34,956
• Residents97,824
• ZIP Code areas it reaches5
• Where it is the only district0
• Where it shares with another district4
• Where it holds under half a percent1
• Land area93 square miles
• Homes per square mile377

The ZIP Code areas it reaches

The spread is the thing to notice. In 83686 this district holds 96% of the homes; in 83607 it holds 2 homes, under half a percent. 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 83686 · Nampa, Idaho96% of the homes
• ZIP Code 83651 · Nampa, Idaho68% of the homes
• ZIP Code 83687 · Nampa, Idaho55% of the homes
• ZIP Code 83641 · Melba, Idaho1.2% of the homes
• ZIP Code 83607 · Caldwell, Idaho2 homes, under half a percent

What one name misses in the areas it leads

Nampa School District 131 is the largest district in 3 ZIP Code areas, and not one of them is wholly its own. Answer with its name alone and the answer misses 10,589 of the 45,527 homes those areas hold. That count is computed here from census blocks; the lookups that answer this question with a single name never print it.

Nampa School District 131 is one of 4 districts the file names for ZIP Code 83687 · Nampa, Idaho at that level. It holds 7,197 of the 13,006 homes there; the rest is 5,809 homes with Vallivue School District 139, Kuna Joint School District 3 and Meridian Joint School District 2. One name for that area is not a simplification, it is a different answer for 5,809 of the homes in it.

ZIP Code 83651 · Nampa, Idaho is a two-district area: 8,808 of its 12,885 homes are inside Nampa School District 131, and the other 4,077 homes are with Vallivue School District 139. Which one an address belongs to is settled by the street, not by the five digits.

Nampa School District 131 holds 18,933 of the 19,636 homes in ZIP Code 83686 · Nampa, Idaho, so its name is right for most of the area and wrong for the rest: 699 homes with Kuna Joint School District 3 and Vallivue School District 139 and 4 homes in a district too small to name here.

Nampa School District 131 is not the name anyone would give for ZIP Code 83641 · Melba, Idaho — Melba Joint School District 136 leads it — and Nampa School District 131 holds 16 homes there all the same. Answer that area with one name and that is what it is wrong about.

Who takes the other homes in its ZIP Codes

Nampa School District 131 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 — Vallivue School District 139, Middleton School District 134 and Caldwell School District 132. They are neighbors on the same postal ground, not the next stop for its own students.

• Vallivue School District 13916,287 homes in 4 shared ZIP Code areas
• Middleton School District 1342,109 homes in 1 shared ZIP Code area
• Caldwell School District 1321,932 homes in 1 shared ZIP Code area
• Melba Joint School District 1361,059 homes in 1 shared ZIP Code area
• Kuna Joint School District 3992 homes in 2 shared ZIP Code areas
• Marsing Joint School District 363471 homes in 2 shared ZIP Code areas

Who it shares ZIP Codes with

These districts appear alongside Nampa School District 131 in the same ZIP Code areas: Vallivue School District 139, Kuna Joint School District 3, Marsing Joint School District 363 and Melba Joint School District 136. 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.

• Vallivue School District 1393 shared ZIP areas
• Kuna Joint School District 32 shared ZIP areas
• Marsing Joint School District 3631 shared ZIP area
• Melba Joint School District 1361 shared ZIP area
• Meridian Joint School District 21 shared ZIP area

Where this district sits

• School districts in Idaho120 of 278 ZIP areas split
• Every district with a page here260 districts listed

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: in 4 of the 5 ZIP Code areas Nampa School District 131 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.

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.