Jefferson County School District No. R-1
Westminster, CO · 162 schools · 75,327 students
Largest Schools
Schools ranked by enrollment. Proficiency data from EDFacts where available.
Other Districts in Colorado
203 schools · 87,883 students · 42% proficiency
88 schools · 62,341 students · 62% proficiency
70 schools · 52,392 students · 58% proficiency
61 schools · 38,122 students · 40% proficiency
Frequently Asked Questions
Jefferson County School District No. R-1 has 162 schools serving 75,327 students. The average proficiency rate across the district is 54%. The average graduation rate is 79%.
Jefferson County School District No. R-1 operates 162 public schools, including Lakewood High School, Ralston Valley Senior High School, Arvada West High School, Chatfield High School, Columbine High School and others. The full school list is shown above with enrollment and grade-level details.
The average graduation rate across high schools in Jefferson County School District No. R-1 is approximately 79% (EDFacts district-level data, most recent reporting year). Individual school graduation rates may vary; this is a district-wide adjusted-cohort graduation rate.
The largest school in Jefferson County School District No. R-1 is Lakewood High School with 1,885 students.
Jefferson County School District No. R-1 serves 75,327 students across 162 schools in CO, per the latest NCES Common Core of Data enrollment.
Jefferson County School District No. R-1's average proficiency rate of 54% (math and reading combined, EDFacts) is around average for US public school districts. "Good" depends on what you value — proficiency is one signal; enrollment trends, class size, graduation rates, and district resources also matter. Check individual school pages for granular data.
Student-teacher ratios are reported at the school level by NCES, not aggregated at the district level in our dataset. Open any individual school page in Jefferson County School District No. R-1 to see its specific student-teacher ratio. The US national average is approximately 16:1 for public schools.
All data comes from the National Center for Education Statistics (NCES) Common Core of Data (enrollment, school count, demographics) and EDFacts assessment results (proficiency rates, graduation rates). Proficiency and graduation rates are reported at the district level. Both are federal sources used by the US Department of Education.
School performance data is sourced from NCES enrollment records and EDFacts proficiency and graduation rate assessments.
this entity is one of the data points covered by this site’s U.S. K-12 school outcomes and enrollment dataset. The detail above comes directly from NCES Common Core of Data and EDFacts; the context that follows situates the headline numbers against the broader distribution across U.S. public schools and districts.
Every number on this page links back to NCES Common Core of Data and EDFacts; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for this entity is typically a peer within U.S. public schools and districts with similar size, similar exposure, or similar geography — not the national-level summary alone.