Enrollment
186
Combined
STATE 523
SCHOOL COMMUNITY·CENTENNIAL SCHOOL DISTRICT NO. R-1·NCES 080636001416
Centennial School
909 NORTH MAIN STREET, SAN LUIS, CO 81152 · (719) 672-3322 · Costilla County
GRADES PK–12COMBINED43-RURALTITLE IREGULAR SCHOOL186 STUDENTS
Student : Teacher
12.2:1
15 FTE teachers
STATE 14.3:1
Free / Reduced Lunch
91%
170 students
STATE 50%
Community
0
0 members
Enrollment and student:teacher ratio compared against other combined schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade
Student demographics
Student head counts by race/ethnicity from federal NCES enrollment data. Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Test scores
CMAS 2024-25 . % Met or Exceeded ExpectationsEnglish Language Arts
16.4%
CO avg 44.9% . +5.6pp since 2023
Math
18.2%
CO avg 36.1% . +13.6pp since 2023
What this means: On the CMAS, Colorado's statewide test, about 16 of every 100 students at this school read and write at grade level and about 18 of 100 do math at grade level. Across all Colorado schools, those numbers are about 45 and 36. Reading and writing scores are up about 6 points since 2023, while math scores are up about 14 points.
Source: CMAS. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
16.4%
composite math + reading, all grades
Predicted
11.3%
based on CO schools with similar FRL share
Beats by
+5.1pp
above demographic expectation
What this means: About 16% of students here test proficient in math and reading, compared with the roughly 11% typical for Colorado schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Colorado's top nor bottom 10%.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
7-year change
SY 2017-18 vs SY 2024-25Enrollment
186
-24 (-11%) vs 2017
Student : Teacher
12.2:1
was 10.3:1
% White
18%
was 3%
% Hispanic
82%
was 96%
% Black
1%
was 1%
Source: NCES Common Core of Data
About Centennial School
Centennial School operates as a rural-scale combined-grade school in SAN LUIS, Colorado, run under Centennial School District No. R-1. Current enrollment sits at 186 students spanning grades pre-K through 12. That puts it 64% below the typical public school in Colorado, which averages around 523 students.
Operationally, Centennial School answers to Centennial School District No. R-1, which sets policy, hires staff, and reports enrollment to the state.
In terms of who attends, Centennial School logs that nearly all students (82%) are Hispanic. The remainder breaks down as 18% White. The wider county runs roughly 55% Hispanic, putting the school's mix visibly more Hispanic than the area baseline.
On the resource side, Centennial School lists 15 full-time-equivalent teachers, putting the student-to-teacher ratio at about 12.2:1. Statewide, the average ratio sits near 14.3:1, putting Centennial School tighter than the state norm the norm. Roughly 91% of students at Centennial School qualify for free or reduced-price lunch, often used as a Title I proxy.
With demographic context factored in, Centennial School tracks the demographic baseline. The model predicts 11.3% given the school's FRL share; actual proficiency is 16.4%.
In the broader community, ACS estimates for Costilla County put median household earnings sit near $36,861, 25% of adults hold a bachelor's degree or higher, and census figures put the poverty rate at about 20%. In all, Costilla County runs 2 public schools (combined enrollment of about 493 students), of which Centennial School is one.
Sierra Grande K-12 School is the nearest neighboring public school, about 15.4 miles from this campus. On composite proficiency, Centennial School comes 7th of 7 in the immediate cluster, beneath the nearby-schools average of 40.6%.
The school occupies a countryside site.
Five-year trend. Looking back 7 years, enrollment at Centennial School has ticked down 11%, going from 210 students in 2018 to 186 in 2025. The White share of enrollment increased from 3% to 18% over that span. Class-load math has rose: from 10.3:1 in 2018 to 12.2:1 in 2025.
On the community side, the page collects discussion, questions, and updates around science fair prep, picture-day reminders, and bus-route questions. Posting is open to anyone connected to the school.
Costilla County at a glance
View full county profilePopulation
3,607
Census ACS
Median income
$36,861
Household, ACS
Bachelor's+
25%
Adults 25+
Poverty rate
20%
Below federal line
Schools in county
2
493 students
Quick facts
Related schools
Nearby schools
- Sierra Grande K-12 School15.4 mi · 307
- Sanford Junior/Senior High School26.9 mi · 166
- Sanford Elementary School26.9 mi · 218
- Manassa Elementary School28.4 mi · 190
- North Conejos Alternative Program29.7 mi · 30
- La Jara Elementary School29.7 mi · 195
Frequently asked questions
About Centennial SchoolHow many students attend Centennial School?
Centennial School enrolls approximately 186 students in grades PK-12.
What grades does Centennial School serve?
Centennial School serves grades PK-12.
What is the student-teacher ratio at Centennial School?
The student-to-teacher ratio at Centennial School is approximately 12.2:1 (15 FTE teachers).
How diverse is Centennial School?
Centennial School reports a student body of 18% White, 82% Hispanic, 1% Black.
Who oversees Centennial School?
Centennial School is overseen by Centennial School District No. R-1 in Costilla County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.