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
C
allk12 Grade
Scored higher than 30% of Colorado public K-12 schools
- DTest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- A-Beats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- ·Three-year trend Not available for this school, so the grade uses the other parts.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded Colorado public K-12 schools
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, 2024-25
| Grade | Students | Share |
|---|---|---|
| Pre-K | 26 | 14% |
| Kindergarten | 13 | 7% |
| Grade 1 | 10 | 5% |
| Grade 2 | 11 | 6% |
| Grade 3 | 7 | 4% |
| Grade 4 | 9 | 5% |
| Grade 5 | 7 | 4% |
| Grade 6 | 10 | 5% |
| Grade 7 | 14 | 8% |
| Grade 8 | 17 | 9% |
| Grade 9 | 18 | 10% |
| Grade 10 | 9 | 5% |
| Grade 11 | 17 | 9% |
| Grade 12 | 18 | 10% |
This year's kindergarten class (13) is 24% smaller than its 8th grade class (17).
Student demographics
30%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
STATE 62% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). 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.
CMAS results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 16.4% | 18.2% |
| 2023-24 | 10.8% | 4.6% |
% Met or Exceeded Expectations, all students and all tested grades.
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 →
Schools most like Centennial School
Centennial School's state test result (16.4% proficient) is higher than 1 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Centennial School this school | 186 | 91.4% | 16.4% |
| Sierra Grande K-12 School BLANCA | 307 | 79.2% | 25.3% |
| Bethune Public Schools BETHUNE | 99 | 71.7% | 18.4% |
| Mountain Valley School SAGUACHE | 105 | 76.2% | 21.5% |
| Kunsmiller Creative Arts Academy DENVER | 670 | 82.1% | 14.4% |
| Holly School HOLLY | 276 | 64.1% | 26.4% |
Matched among Colorado K-12 schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Centennial School ranks
Among K-12 schools| Measure | This school | In Colorado |
|---|---|---|
| State test proficiency ranked highest first | 16.4% | #16 of 17 |
| Math proficiency ranked highest first | 18.2% | #14 of 17 ▲ 3 |
| Reading proficiency ranked highest first | 16.4% | #16 of 17 ▲ 1 |
| Enrollment ranked largest first | 186 | #15 of 38 |
| Free and reduced lunch ranked highest share first | 91.4% | #1 of 21 |
| Enrollment change since 2017-18 ranked steepest decline first | -11.4% | #4 of 7 |
Ranked against other public K-12 schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
186
-38 (-17%) vs 2020
+84% since 1990-91, when it was 101
Student : Teacher
12.2:1
was 13.2:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 186 | 15.3 | 12.2:1 | 91% (170) |
| 2023-24 | 186 | 11.2 | 16.6:1 | 94% (174) |
| 2022-23 | 193 | 16.6 | 11.6:1 | 84% (163) |
| 2020-21 | 224 | 17 | 13.2:1 | 86% (193) |
| 2017-18 | 210 | 20.4 | 10.3:1 | 91% (192) |
| 2015-16 | 229 | 19 | 12.1:1 | 86% (196) |
| 2010-11 | 88 | 8 | 11.0:1 | 77% (68) |
| 2000-01 | 88 | 8 | 11.0:1 | 80% (70) |
| 1990-91 | 101 | 11 | 9.2:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Centennial School.
Since 2017-18: students down 11% (210 to 186); teachers down 25% (20.4 to 15.3).
About Centennial School
Centennial School operates as a small combined-grade school in SAN LUIS, Colorado. The school's enrollment of 186 students covers pre-K through 12. Enrollment is 64% lower than the average for combined schools in Colorado, which is about 523.
Centennial School is listed under Centennial School District No. R-1 in federal data.
Most students at Centennial School are Hispanic: 82% of enrollment. Smaller groups are 18% White. For comparison, the population of Costilla County is roughly 55% Hispanic. The chance that two students picked at random at Centennial School belong to different racial or ethnic groups, known as the diversity index, is 30%.
Centennial School employs 15.3 full-time-equivalent teachers. That gives a ratio of about 12.2:1. That ratio is under the 14.3:1 average for combined schools in Colorado. Free or reduced-price lunch eligibility was 91% in 2024-25.
Centennial School is graded C by allk12, scoring above 30% of Colorado public K-12 schools once test results, poverty-adjusted performance, and the recent trend are combined.
Centennial School's average proficiency rate on state tests of 16.4% is 5.1 points above the 11.3% the model predicts from its lunch-eligibility share.
Within Costilla County, median household income is about $36,861, 25% of adults hold a bachelor's degree or higher, and about 20% of people live in poverty. The public schools of Costilla County number 2 and enroll about 493.
Nearby, Sierra Grande K-12 School is about 15.4 miles away. Centennial School ranks 7th of 7 among nearby schools on average proficiency, with 16.4% against a local average of 40.6%.
The federal government classifies Centennial School's location as Rural: Remote.
Centennial School saw enrollment fall 17% between 2020-21 and 2024-25. The number of students per teacher fell from 13.2 to 12.2 over 4 years.
Community posts for Centennial School can cover sports schedules, lunch menus, and spirit week. Alumni can share how the school prepared them.
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
Other Centennial schools
4 other US public schools in 3 states are named Centennial. Centennial School is the 4th largest of the 5.
- Centennial SchoolBartlett, IL · 514 students
- Centennial SchoolROOSEVELT, UT · 438 students
- Centennial SchoolOrland Park, IL · 392 students
- Centennial SchoolEl Paso, IL · 165 students
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.