Zip code 95310 is not served by one district. An elementary district and a separate secondary district each cover this area, which is normal in this state — which one your child attends depends on their grade.
| GRADES | DISTRICT | RATING |
|---|---|---|
| K–8 Elementary | Columbia Union Elementary School District 438 students · 1 school | 5/10 |
| 9–12 Secondary | Sonora Union High School District 1,087 students · 3 schools | 6/10 |
| Metric | Columbia Union Elementary School District | National Average | Comparison |
|---|---|---|---|
| Student Enrollment | 1,087 | 3,700 | ↓ Smaller than avg |
| Number of Schools | 3 | 6 | Varies by district |
| Per-Pupil Spending | $15,700/yr (est.) | $13,700/yr | State avg est. |
| District Type | Public School District | Public District | — |
| Overall Rating | 6/10 — Average | — | Near average |
| District | Rating | Percentile | Students |
|---|---|---|---|
| Columbia Union Elementary School District (this district) | 6/10 | 53rd | 1,087 |
| Jamestown Elementary School District | 3/10 | 27th | 380 |
| Mariposa County Unified School District | 4/10 | 38th | 1,688 |
| Ballico-Cressey Elementary School District | 5/10 | 48th | 369 |
🔢 Show the math behind this rating
Ranked against 963 rated districts in CA → 53rd percentile → 6/10.
Source: California Dept. of Education CAASPP Smarter Balanced, 2023–24 school year. Full methodology →
- Sonora High — Grades 9–12 · 880 students
- Theodore Bird High — Grades 9–12 · 65 students
- Dario Cassina High — Grades 10–12 · 44 students
About Columbia Union Elementary School District
Families in zip code 95310 (Columbia, California) are assigned to Columbia Union Elementary School District for public education through 8th. This overview covers the district’s funding levels, scale, rating, and what to expect from the enrollment process if you’re moving to or within this zip code.
Understanding the 6/10 Rating
Columbia Union Elementary School District has earned an overall SchoolDistrictFinder rating of 6/10, placing it in the average tier. Our ratings are based on state assessment results — the share of students scoring proficient or above in reading and math, as reported in California’s CAASPP Smarter Balanced assessments (2023–24 school year). We average each district’s reading and math proficiency, then rank it against other districts in the same state to produce a 1–10 score. Because California is compared only against itself, the rating reflects how this district performs relative to its in-state peers.
Columbia Union Elementary School District falls near the middle of California on state assessment results, with reading and math proficiency close to the state median. Average-rated districts provide foundational public education, and many families find they deliver solid day-to-day learning — particularly when parents stay engaged. If you're considering this area, look beyond the overall rating: visit schools, talk to current parents, and research the specific school your child would attend. Average districts often have individual schools that significantly outperform the district mean.
Enrollment for Families in Zip Code 95310
Children in zip code 95310 are assigned to Columbia Union Elementary School District for public school enrollment, covering grades Kindergarten – 8th. School assignments are address-specific — your elementary, middle, and high school placements depend on your exact street address within zip code 95310, not just your neighborhood. Two homes on opposite ends of the same zip code may be assigned to different schools within the same district.
To confirm your specific school assignments, contact Columbia Union Elementary School District at (209)533-8510 or visit www.sonorahigh.org. Typical enrollment documents include proof of residency (lease or deed plus a utility bill), your child’s birth certificate, current immunization records, and prior school records. If your child has an IEP or 504 plan, bring that documentation to enrollment — California districts are required to continue services within a reasonable period. Fall enrollment windows typically open in late winter or early spring; contact the district for exact dates and required steps.
School Districts and Home Values in Columbia
School district quality is one of the most consistent factors in residential home pricing. Because Columbia Union Elementary School District serves zip code 95310, district assignment still factors into home-pricing comparisons between zip code 95310 and neighboring areas. District boundaries are address-specific — verify the exact district assignment for any property you’re seriously considering rather than assuming based on the neighborhood. A single block can place two adjacent homes in different districts with different ratings and different annual property tax implications.
Use the property tax estimator on this page to calculate estimated annual tax obligations based on your target purchase price. In California, property taxes are a primary funding source for public schools — your tax payments directly support Columbia Union Elementary School District programs and staff. Understanding both district quality and the associated tax burden is essential financial due diligence before committing to any home in zip code 95310.
Data Sources and Accuracy
All district information on this page is sourced from the NCES Common Core of Data (CCD) 2024–2025, the U.S. Department of Education’s annual census of all public school districts — the same dataset used by researchers, journalists, and policymakers to analyze American public education. District boundaries, school assignments, phone numbers, and per-pupil expenditure figures are updated annually when NCES publishes new data, typically in spring. Always verify your specific school assignment and enrollment requirements directly with Columbia Union Elementary School District before making any housing or enrollment decision based on zip code 95310 data.