Total enrollment
73,532
-6,137 (-8%) vs SY 2020-21
165 schools in Jefferson County School District No. R-1
Colorado · 74,935 students · 15 cities
Across 165 public schools, Jefferson County School District No. R-1 (Colorado) serves approximately 74,935 K-12 students across 90 elementary, 20 middle, and 30 high.
4-year change in Jefferson County School District No. R-1
SY 2020-21 vs SY 2024-25School count
144
-16 (-10%) vs SY 2020-21
Source: NCES Common Core of Data, enrollment-weighted demographic averages
How Jefferson County School District No. R-1 ranks
Among districts| Measure | This district | In Colorado | In the US |
|---|---|---|---|
| State test proficiency ranked highest first | 43.9% | #15 of 70 | N/A |
| Enrollment ranked largest first | 74,935 | #2 of 95 | #46 of 9,234 |
| Number of schools ranked most first | 148 | #2 of 95 | N/A |
| Students per teacher ranked fewest first | 16.8:1 | #68 of 95 | #7,009 of 9,044 |
| Free or reduced-price lunch share ranked highest first | 31.7% | #80 of 94 | #6,465 of 8,164 |
| Diversity index ranked most diverse first | 52.0% | #31 of 68 | #2,728 of 6,853 |
Districts need at least 2 schools and 500 students to be ranked. Test proficiency is ranked within the state only, since each state gives a different test. Each rank links to the full list.
Inside Jefferson County School District No. R-1
State test results across the district's 124 scored schools run from Dennison Elementary School at 88.8% proficient to Lumberg Elementary School at 8.2%, a gap of 80.6 points. That is the 3rd widest gap among 55 Colorado districts with four or more scored schools.
Since 2017-18, the 139 district schools that reported both years went from 77,275 to 72,641 students (down 6%) and from 4,189 to 4,297 full-time teachers (up 3%), as of 2024-25.
Proficient is the average share of students meeting the state standard across each school's state tests in 2023-24 and 2024-25; schools with fewer than 100 students and schools serving specialized populations are left out. Staffing figures come from the NCES Common Core of Data and count only schools that reported students and teachers in both years.
About Jefferson County School District No. R-1
Jefferson County School District No. R-1 is an expansive Colorado school district running 165 schools with combined enrollment near 74,935.
Looking at the level breakdown, Jefferson County School District No. R-1 is made up of 90 elementary, 20 middle, 30 high schools, and 25 combined or other.
Trend over the past 4 years. Total public-school enrollment in Jefferson County School District No. R-1 has fell 8% since SY 2020-21, moving from about 79,669 students to 73,532. The school count fell from 160 to 144 across the same 4-year window.
On allk12, the community for Jefferson County School District No. R-1 discusses enrollment trends, district policy changes, and bus-route updates. Members of the local community share what they see day-to-day.