ZIP Code 95403 · Santa Rosa, California
Sonoma County · 17,458 counted · 5 districts
Each percentage here is a share of the 17,458 homes counted in ZIP Code 95403, 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.
The districts named for the early grades in ZIP Code 95403, Santa Rosa, California are not the districts named for high school, and the set changes in both directions: 1 district arrives for high school only, 3 run the early grades and stop, and 1 serves both bands. 5 districts hold the 17,458 homes counted here between them, and Santa Rosa High is the largest by homes. The largest share is high enough that one name is right for most of the homes counted and wrong for the other 337: 337 homes with Windsor Unified.
The early grades are divided four ways
4 districts hold a measurable share of ZIP Code 95403 at this level. Santa Rosa Elementary is the largest with 7,688 homes; the smallest of them holds 337 homes. Santa Rosa Elementary, Piner-Olivet Union Elementary and Mark West Union Elementary are named here for grade school and not for high school.
Every track below is 35 cells long and stands for all 17,458 homes counted in ZIP Code 95403, so one cell is 499 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.
- Santa Rosa Elementary School District7,688 of 17,458 homes44%
- Piner-Olivet Union Elementary School District4,974 of 17,458 homes28%
- Mark West Union Elementary School District4,459 of 17,458 homes26%
- Windsor Unified School District337 of 17,458 homes1.9%
High school is split between two districts
2 districts hold a measurable share of ZIP Code 95403 at this level. Santa Rosa High is the largest with 17,121 homes; the smallest of them holds 337 homes. Santa Rosa High is named here for high school and not for the early grades.
- Santa Rosa High School District17,121 of 17,458 homes98%
- Windsor Unified School District337 of 17,458 homes1.9%
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
Then confirm it with the district office. Each district named here, with its NCES district ID, website and phone:
- Santa Rosa High School District NCES ID 0635830 srcschools.org (707) 890-3800
- Santa Rosa Elementary School District NCES ID 0635810 srcschools.org (707) 890-3800
- Piner-Olivet Union Elementary School District NCES ID 0630450 pousd.org (707) 522-3000
- Mark West Union Elementary School District NCES ID 0624000 mwusd.org (707) 524-2970
- Windsor Unified School District NCES ID 0600034 wusd.org (707) 837-7701
The set of names changes in both directions
Santa Rosa High is named for high school here and for no elementary grades, and Santa Rosa Elementary, Piner-Olivet Union Elementary and Mark West Union Elementary run the early grades and no more. An address on the wrong street can therefore change district at the change of grade and land in a district that was never part of its elementary answer, while a neighbor two blocks away keeps one name the whole way through.
What one district name costs in 95403
A lookup that answers ZIP Code 95403 with one district name has to pick one of the names below and drop the rest. Measured against the 17,458 homes counted here, for the early grades it is wrong for 9,770 homes and for high school it is wrong for 337 homes. That is the whole difference between this page and a one-line answer: the same federal file, read to the end instead of to the first row.
The districts that reach into 95403
The districts named above are not alike in size or in reach. Santa Rosa High touches 14 ZIP Code areas in all and holds 17,121 homes inside this one; Piner-Olivet Union Elementary touches 4 areas. Not one of them is ever the only district in a ZIP Code area anywhere in the country: every postal area they touch, they share with somebody.
- Santa Rosa High School District17,121 of 17,458 here · 14 ZIP areas in all
- Santa Rosa Elementary School District7,688 of 17,458 here · 5 ZIP areas in all
- Piner-Olivet Union Elementary School District4,974 of 17,458 here · 4 ZIP areas in all
- Mark West Union Elementary School District4,459 of 17,458 here · 5 ZIP areas in all
- Windsor Unified School District337 of 17,458 here · 5 ZIP areas in all
Where Santa Rosa Elementary goes from here
Santa Rosa Elementary School District runs kindergarten through grade 6, and it shares all 5 ZIP Code areas it touches with neighbors and is the only district in none of them. Inside its own boundary it holds 28,819 homes over 14 square miles; the part of it counted in ZIP Code 95403 is 7,688 of those. The district it shares the most postal ground with is Santa Rosa High School District, across 5 ZIP Code areas. Its thinnest measured foothold is elsewhere: in ZIP Code area 95407 it holds 907 of 13,138 homes, or 6.9% of them.
How 95403 compares in California
Across California the boundary file names more than one district in 996 of the 1,788 ZIP Code areas it names a district for, 56% of them, and 3 areas in the state have no high school district named for part of their homes. Counting the districts named at either level, 70 areas in California name more than this ZIP Code does and 1,638 name fewer. Nationally more than one district is named in 53% of 33,555 areas.
Look up 95403 again, or look up another ZIP Code
The lookup holds every ZIP Code area in the country with homes in it, including the ones with no page of their own. Opening it at 95403 recomputes the same 17,458 homes from the same snapshot, and typing five other digits answers for somewhere else. No server is asked for the answer: the whole index travels with the lookup page itself.
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: 337 of the 17,458 homes counted in 95403 sit outside the district holding the most of them, and the line between the two runs along streets rather than around the postal area.
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.
What this site can hand you instead:
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.