| District | City | Rating | Students | Schools | Grades | Zip Codes |
|---|---|---|---|---|---|---|
| Jefferson County School District R-1 | Arvada | 9/10 Excellent · 85th pct | 75,327 | 162 | PK–12 | 28 |
How Jefferson County compares
It enrolls 75,327 students across 162 schools. Its rating of 9/10 is above the Colorado average of 5.6/10.
School Districts in Jefferson County, Colorado
Jefferson County has 1 public school district covering 28 zip codes. The top-rated district in Jefferson County is Jefferson County School District R-1 (9/10). Ratings are based on the share of students proficient in reading and math on state assessments (CMAS 2025), ranked against all districts in Colorado. 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 Jefferson County, CO?
1 school district serves zip codes in Jefferson County, CO. The table above shows its rating, enrollment, grade span and the zip codes it covers.
What is the best-rated school district in Jefferson County, CO?
Of the districts serving Jefferson County, Jefferson County School District R-1 has the highest rating on this site at 9/10. That places it in the 85th percentile among Colorado school districts.
How are these school district ratings calculated?
Each rating is the share of students scoring proficient or above on Colorado reading and math assessments, ranked against other districts in Colorado and converted to a 1–10 scale. Percentiles compare districts within Colorado only, never across state lines.