Alvord Unified School District

It never has a ZIP Code to itself

At 1,036 homes to the square mile this is city territory, and district lines in a city follow streets. Alvord Unified covers 32 square miles in all — small enough that a single ZIP Code area can hold most of it, and several ZIP Codes can cut across it.

• Homes inside the boundary32,661
• Residents111,185
• ZIP Code areas it reaches7
• Where it is the only district0
• Where it shares with another district3
• Where it holds under half a percent4
• Land area32 square miles
• Homes per square mile1,036

The ZIP Code areas it reaches

The spread is the thing to notice. In 92505 this district holds 97% of the homes; in 91752 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 92505 · Riverside, California97% of the homes
• ZIP Code 92503 · Riverside, California56% of the homes
• ZIP Code 92879 · Corona, California19% of the homes
• ZIP Code 92881 · Corona, California5 homes, under half a percent
• ZIP Code 92860 · Norco, California1 home, under half a percent
• ZIP Code 92504 · Riverside, California1 home, under half a percent
• ZIP Code 91752 · Jurupa Valley, Californiano homes at all

What one name misses in the areas it leads

Alvord Unified is the largest district in 2 ZIP Code areas, and not one of them is wholly its own. Answer with its name alone and the answer misses 11,769 of the 41,627 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.

Alvord Unified holds 14,772 of the 26,153 homes in ZIP Code 92503 · Riverside, California, so its name is right for most of the area and wrong for the rest: 11,381 homes with Riverside Unified.

In ZIP Code 92505 · Riverside, California the split runs 15,086 to 388 and the larger part is Alvord Unified's: the rest is 388 homes with Riverside Unified.

Alvord Unified reaches into ZIP Code 92879 · Corona, California with 2,796 of its 14,526 homes, behind Corona-Norco Unified. The familiar answer for that area is the other name, and it is wrong for those 2,796 homes.

Who takes the other homes in its ZIP Codes

Alvord Unified runs kindergarten 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 — Corona-Norco Unified, Riverside Unified and Jurupa Unified. They are neighbors on the same postal ground, not the next stop for its own students.

• Corona-Norco Unified School District31,655 homes in 4 shared ZIP Code areas
• Riverside Unified School District29,046 homes in 3 shared ZIP Code areas
• Jurupa Unified School District8,056 homes in 1 shared ZIP Code area

Who it shares ZIP Codes with

These districts appear alongside Alvord Unified in the same ZIP Code areas: Riverside Unified and Corona-Norco Unified. 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.

• Riverside Unified School District2 shared ZIP areas
• Corona-Norco Unified School District1 shared ZIP area

Where this district sits

• School districts in California996 of 1,788 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 3 of the 7 ZIP Code areas Alvord Unified 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.