| District | City | Rating | Students | Schools | Grades | Zip Codes |
|---|---|---|---|---|---|---|
| Orinda Union Elementary School District | Orinda | 10/10 Excellent · 99th pct | 2,516 | 5 | K–8 | 0 |
| Lafayette Elementary School District | Lafayette | 10/10 Excellent · 98th pct | 3,180 | 5 | K–8 | 0 |
| Moraga Elementary School District | Moraga | 10/10 Excellent · 97th pct | 1,735 | 4 | K–8 | 0 |
| San Ramon Valley Unified School District | Danville | 10/10 Excellent · 96th pct | 29,680 | 37 | K–12 | 6 |
| Acalanes Union High School District | Canyon | 10/10 Excellent · 95th pct | 5,420 | 5 | 9–12 | 8 |
| Walnut Creek Elementary School District | Walnut Creek | 10/10 Excellent · 92nd pct | 3,435 | 7 | K–8 | 0 |
| Canyon Elementary School District | Canyon | 9/10 Excellent · 84th pct | 65 | 1 | K–8 | 0 |
| Brentwood Union Elementary School District | Brentwood | 8/10 Good · 75th pct | 9,435 | 11 | K–8 | 0 |
| Martinez Unified School District | Martinez | 8/10 Good · 74th pct | 3,772 | 9 | K–12 | 1 |
| Knightsen Elementary School District | Knightsen | 7/10 Good · 65th pct | 577 | 2 | K–8 | 1 |
| Byron Union Elementary School District | Byron | 7/10 Good · 64th pct | 1,230 | 4 | K–12 | 1 |
| Liberty Union High School District | Discovery Bay | 7/10 Good · 63rd pct | 8,233 | 5 | 9–12 | 4 |
| Mount Diablo Unified School District | Clayton | 7/10 Good · 60th pct | 29,201 | 52 | K–12 | 7 |
| Oakley Union Elementary School District | Oakley | 4/10 Below Average · 39th pct | 5,059 | 9 | K–8 | 0 |
| West Contra Costa Unified School District | El Cerrito | 3/10 Below Average · 29th pct | 25,737 | 54 | K–12 | 8 |
| John Swett Unified School District | Crockett | 2/10 Poor · 17th pct | 1,234 | 4 | K–12 | 3 |
| Pittsburg Unified School District | Pittsburg | 2/10 Poor · 15th pct | 10,665 | 13 | K–12 | 1 |
| Antioch Unified School District | Antioch | 2/10 Poor · 11th pct | 15,192 | 25 | K–12 | 2 |
How Contra Costa County compares
Together they enroll 156,366 students across 252 schools. The largest is San Ramon Valley Unified School District with 29,680 students. Districts here average 7.0/10, above the California average of 5.7/10. Ratings range from 2/10 to 10/10.
School Districts in Contra Costa County, California
Contra Costa County has 18 public school districts covering 42 zip codes. The top-rated district in Contra Costa County is Orinda Union Elementary School District (10/10). Ratings are based on the share of students proficient in reading and math on state assessments (CAASPP 2023–24), ranked against all districts in California. Directory details come from NCES CCD 2024–25.
Enter your zip code on any page to confirm your exact district assignment — district boundaries are address-specific and may not follow county or city lines.
Frequently Asked Questions
How many school districts are in Contra Costa County, CA?
18 school districts serve zip codes in Contra Costa County, CA. This page lists each one with its rating, enrollment, grade span and the zip codes it covers.
What is the best-rated school district in Contra Costa County, CA?
Of the districts serving Contra Costa County, Orinda Union Elementary School District has the highest rating on this site at 10/10. That places it in the 99th percentile among California school districts.
How are these school district ratings calculated?
Each rating is the share of students scoring proficient or above on California reading and math assessments, ranked against other districts in California and converted to a 1–10 scale. Percentiles compare districts within California only, never across state lines.