Enrollment
557
Arizona · 2024-25 NCES data
Other / mixed grade configuration · San Tan Valley, AZ
Copper Basin
Federal NCES profile for Copper Basin, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 37/100.
2024-25 NCES dataOther / mixed grade configurationNCES 040292002436
👥 S:T ratio 40
🌟 Gifted program 70
📋 Attendance 0
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Copper Basin earns 37/100 on the Resource Investment Index, with class sizes near the Arizona median.
- #3 of 9
- schools in San Tan Valley · Resource Index
- 37
- Resource Index · Typical
- 15.1:1
- students per teacher
- 45.0%
- free-lunch eligible
Copper Basin has class sizes near the Arizona median. Computed live against every Arizona school reporting to NCES.
By Resource Investment Index, Copper Basin ranks #3 of 9 schools in San Tan Valley, AZ.
School address
District: Florence Unified School District (4437) · Arizona
NCES ID 040292002436 Verify on NCES CCD record →
Teachers (FTE)
37.0
Federal CCD staff survey
Students per teacher
15.1:1
vs 17:1 Arizona avg
-11% vs state
Free-lunch eligible
45.0%
vs 48.3% Arizona avg
-7% vs state
Student-teacher ratio in context
How Copper Basin compares with Arizona and U.S. medians
What stands out at Copper Basin
Copper Basin is a mid-sized combined-grade school in San Tan Valley, Arizona, enrolling 557 students.
Class sizes run a bit leaner than typical: 15.1:1 puts it in the smaller third of Arizona schools by student-teacher ratio.
Its free-meal eligibility rate of 45.0% lands close to the Arizona typical range, neither a high- nor low-need campus by this measure.
Enrollment of 557 puts it in the larger third of Arizona schools by headcount.
Its Resource Investment Index lands in the upper third of 2,064 scored Arizona schools.
Against 340 statewide peers matched on enrollment and economic need, it ranks in the upper tier at #63.
Its student body is led by Hispanic or Latino (47%) and White (36%) (diversity index 64/100).
Chronic absenteeism is elevated: 49.4% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding Florence Unified School District (4437) spends $8,692 per pupil, 34% below the Arizona average, a leaner-resourced district than most.
Its district draws 16.0% of revenue from federal sources, an above-typical federal share that tends to track a higher-need student population.
Among San Tan Valley's public schools, it stands alongside American Leadership Academy Ironwood K12 (2,084 students): Copper Basin is smaller than that campus by headcount.
Florence Unified School District (4437) also operates Poston Butte High School (1,310 students) and Florence High School (857 students) alongside Copper Basin.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Copper Basin compares
Copper Basin on the metrics families compare, against Arizona and U.S. means.
| Metric | This school | vs Arizona | Arizona avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 15.1:1 | ▼ 11% | 17:1 | 15.7:1 |
| Free-lunch eligible | 45.0% | ▼ 7% | 48.3% | 51.7% |
| Enrollment | 557 | top 33% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
15.1:1
Leaner classes than 46% of US schools, a middle-of-the-pack class size.
557
Bigger than 68% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
45.0%
free-lunch eligible
- 7% below the Arizona average of 48.3%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
15.1:1
students per teacher
- 11% below state mean
Top 37% in Arizona - lower ratio than 63% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
49.4%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$8,692
per pupil, district-wide
- below Arizona avg of $13,145
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
62
in-school suspensions + 41 out-of-school
Suspension rate: 11.1 per 100 students. Combined in-school and out-of-school rate: 18.5 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
Hispanic or Latino 47.4%
White 35.9%
African American 7.2%
Two or More 5.2%
American Indian / Alaska Native 2.9%
Native Hawaiian / Pacific Islander 0.9%
Asian 0.5%
Largest group: Hispanic or Latino at 47.4% of enrollment.
Student-body diversity index 63.8/100
Simpson diversity index - at 63.8, Copper Basin is more mixed than the Arizona school average of 47.2.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Florence Unified School District (4437), which includes Copper Basin.
$8,692
Per student
-34%
vs Arizona
Avg $13,145
-48%
vs U.S.
Avg $16,593
Revenue mix
Local 31.7%
State 52.4%
Federal 16.0%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Copper Basin Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Poston Butte High School | Larger | Lower economic need | Higher S:T ratio |
| Florence High School | Larger | Similar economic need | Higher S:T ratio |
| Florence K-8 | Larger | Similar economic need | Higher S:T ratio |
| San Tan Foothills High School | Larger | Lower economic need | Similar S:T ratio |
| Circle Cross K8 Stem Academy | Larger | Lower economic need | Higher S:T ratio |
Comparisons are relative to Copper Basin's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,310
- Students per teacher
- 18.5:1
- Resource Index
- 23/100
- Enrollment
- 857
- Students per teacher
- 20.4:1
- Resource Index
- 16/100
- Enrollment
- 805
- Students per teacher
- 20.6:1
- Resource Index
- 29/100
- Enrollment
- 793
- Students per teacher
- 16.5:1
- Resource Index
- 21/100
- Enrollment
- 728
- Students per teacher
- 17.3:1
- Resource Index
- 41/100
Similar other schools in San Tan Valley
6 comparable other schools (grades Mixed) serving the same city.
American Leadership Academy Ironwood K12
Standard public school
2,084 students
Poston Butte High School
Standard public school
1,310 students 18.5:1 students per teacher
Combs High School
Standard public school
1,182 students 20:1 students per teacher
Walker Butte K-8
Standard public school
718 students 15.6:1 students per teacher
San Tan Heights Elementary
Standard public school
669 students 17.2:1 students per teacher
Skyline Ranch Elementary School
Standard public school
583 students 14.2:1 students per teacher
Similar other schools statewide
Matched by enrollment size and by staffing ratio across all of Arizona, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~557 students)
Similar student-teacher ratio (~15.1:1)
Next steps
Verify locally before acting on Copper Basin's federal record.
- Compare Copper Basin against another school. Compare schools
- Florence Unified School District (4437)'s spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Copper Basin
How many students attend Copper Basin?
Copper Basin has 557 students enrolled. It is a public school in San Tan Valley, AZ.
What is the student-teacher ratio at Copper Basin?
The student-teacher ratio at Copper Basin is 15.1:1, which is 11% lower than the Arizona average of 17:1 and 4% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Copper Basin?
45.0% of students at Copper Basin are eligible for free lunch, compared to the Arizona average of 48.3%.
What is the racial and ethnic makeup of Copper Basin?
The largest demographic group at Copper Basin is Hispanic or Latino at 47.4% of enrollment, in San Tan Valley, AZ. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 63.8/100.
What is the Resource Investment Index for Copper Basin?
Copper Basin has a Resource Investment Index of 37/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Copper Basin rank among schools in San Tan Valley?
By Resource Investment Index, Copper Basin ranks #3 of 9 schools in San Tan Valley, AZ. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in San Tan Valley on the city page.
Is Copper Basin a good school?
Copper Basin earns 37/100 on the Resource Investment Index, with class sizes near the Arizona median. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Florence Unified School District (4437)?
Besides Copper Basin, Florence Unified School District (4437) also operates Poston Butte High School (1,310 students), Florence High School (857 students), and Florence K-8 (805 students). See the Florence Unified School District (4437) district page for the complete list.
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Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.