Enrollment
203
Arizona · 2024-25 NCES data
Other / mixed grade configuration · Phoenix, AZ
Keystone Montessori Charter School
Federal NCES profile for Keystone Montessori Charter School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 30/100.
2024-25 NCES dataOther / mixed grade configurationNCES 040016501755Charter school
🌟 Gifted program 30
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Keystone Montessori Charter School earns 30/100 on the Resource Investment Index on federal resource data. It is also more racially and ethnically mixed than most Arizona schools.
- #85 of 179
- schools in Phoenix · Resource Index
- 30
- Resource Index · Lower
- 203
- students enrolled
By Resource Investment Index, Keystone Montessori Charter School ranks #85 of 179 schools in Phoenix, AZ.
School address
NCES ID 040016501755 Verify on NCES CCD record →
What stands out at Keystone Montessori Charter School
Keystone Montessori Charter School is a mid-sized charter combined-grade school in Phoenix, Arizona, enrolling 203 students.
Enrollment of 203 puts it in the smaller third of Arizona schools by headcount.
Its Resource Investment Index sits near the middle of the pack among 2,064 scored Arizona schools.
Its student body is led by White (45%) and Hispanic or Latino (32%), more mixed than most schools in the state (diversity index 67/100).
The surrounding Keystone Montessori Charter School Inc. (10878) spends $19,032 per pupil, 45% above the Arizona average, a better-resourced district than most.
Among Phoenix's public schools, it stands alongside Pan-American Charter School (1,221 students): Keystone Montessori Charter School is smaller than that campus by headcount.
Keystone Montessori Charter School Inc. (10878) is a single-school charter district, so Keystone Montessori Charter School operates independently rather than alongside district-mates.
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 Keystone Montessori Charter School compares
Keystone Montessori Charter School on the metrics families compare, against Arizona and U.S. means.
| Metric | This school | vs Arizona | Arizona avg | U.S. avg |
|---|---|---|---|---|
| Enrollment | 203 | top 71% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
203
Bigger than 20% of US schools by enrollment, a small campus.
Equity indicators (what these measure)
Funding equity
$19,032
per pupil, district-wide
- above Arizona avg of $13,145
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
8
in-school suspensions + 5 out-of-school
Suspension rate: 3.9 per 100 students. Combined in-school and out-of-school rate: 6.4 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
White 45.3%
Hispanic or Latino 32.0%
Two or More 12.3%
Asian 5.4%
African American 4.4%
American Indian / Alaska Native 0.5%
Largest group: White at 45.3% of enrollment.
Student-body diversity index 67.2/100
Simpson diversity index - at 67.2, Keystone Montessori Charter School is more mixed than the Arizona school average of 47.2.
Programs
Funding & spending
District-wide per-pupil expenditure for Keystone Montessori Charter School Inc. (10878), which includes Keystone Montessori Charter School.
$19,032
Per student
+45%
vs Arizona
Avg $13,145
+15%
vs U.S.
Avg $16,593
Revenue mix
Local 37.8%
State 54.9%
Federal 7.3%
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.
Similar other schools in Phoenix
6 comparable other schools (grades Mixed) serving the same city.
Pan-American Charter School
Standard public school
1,221 students
Great Hearts Academies - Anthem Prep
Standard public school
1,031 students
Westwind Elementary School
Standard public school
932 students 19.4:1 students per teacher
Stetson Hills School
Standard public school
887 students 17.4:1 students per teacher
Union Park School
Standard public school
873 students 19:1 students per teacher
Fireside Elementary School
Standard public school
693 students 15.1:1 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.
Next steps
Verify locally before acting on Keystone Montessori Charter School's federal record.
- Compare Keystone Montessori Charter School against another school. Compare schools
- Keystone Montessori Charter School Inc. (10878)'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 Keystone Montessori Charter School
How many students attend Keystone Montessori Charter School?
Keystone Montessori Charter School has 203 students enrolled. It is a public school in Phoenix, AZ.
What is the racial and ethnic makeup of Keystone Montessori Charter School?
The largest demographic group at Keystone Montessori Charter School is White at 45.3% of enrollment, in Phoenix, AZ. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 67.2/100.
What is the Resource Investment Index for Keystone Montessori Charter School?
Keystone Montessori Charter School has a Resource Investment Index of 30/100 (lower reported resources relative to schools nationally) based on 1 factor: student-teacher ratio. Not a test-score or academic measure (national median ~41/100, see methodology). Limited indicators were available, so the index reflects partial data.
How does Keystone Montessori Charter School rank among schools in Phoenix?
By Resource Investment Index, Keystone Montessori Charter School ranks #85 of 179 schools in Phoenix, AZ. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in Phoenix on the city page.
Is Keystone Montessori Charter School a good school?
Keystone Montessori Charter School earns 30/100 on the Resource Investment Index on federal resource data. It is also more racially and ethnically mixed than most Arizona schools. 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 Keystone Montessori Charter School Inc. (10878)?
None; Keystone Montessori Charter School Inc. (10878) is a single-school charter district, and Keystone Montessori Charter School is its only campus.
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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.