Enrollment
508
Michigan · 2024-25 NCES data
Elementary school (grades K-5) · Ann Arbor, MI
Ann Arbor Open at Mack School
Federal NCES profile for Ann Arbor Open at Mack School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 29/100.
2024-25 NCES dataElementary school (grades K-5)NCES 260282004006
👥 S:T ratio 38
🌟 Gifted program 30
🎓 Counselors 0
📋 Attendance 47
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Ann Arbor Open at Mack School earns 29/100 on the Resource Investment Index, with class sizes near the Michigan median.
- #16 of 18
- elementary schools in Ann Arbor · Resource Index
- 29
- Resource Index · Lower
- 15.4:1
- students per teacher
- 10.3%
- free-lunch eligible
Ann Arbor Open at Mack School has class sizes near the Michigan median. Computed live against every Michigan school reporting to NCES.
By Resource Investment Index, Ann Arbor Open at Mack School ranks #16 of 18 elementary schools in Ann Arbor, MI.
School address
District: Ann Arbor Public Schools · Michigan
NCES ID 260282004006 Verify on NCES CCD record →
Teachers (FTE)
33.0
Federal CCD staff survey
Students per teacher
15.4:1
vs 17.5:1 Michigan avg
-12% vs state
Free-lunch eligible
10.3%
vs 54.3% Michigan avg
-81% vs state
Student-teacher ratio in context
How Ann Arbor Open at Mack School compares with Michigan and U.S. medians
What stands out at Ann Arbor Open at Mack School
Ann Arbor Open at Mack School is a lower-poverty, mid-sized elementary school in Ann Arbor, Michigan, enrolling 508 students.
Class sizes run a bit leaner than typical: 15.4:1 puts it in the smaller third of Michigan schools by student-teacher ratio.
Comparatively few students face economic hardship here, 10.3% free-meal eligibility runs 81% below the Michigan average.
Enrollment of 508 puts it in the larger third of Michigan schools by headcount.
Its Resource Investment Index sits near the middle of the pack among 3,375 scored Michigan schools.
Among 286 similarly sized, similarly resourced-need Michigan schools statewide, it ranks #220, in the lower tier once campus size and economic need are matched.
Its student body is led by White (70%) and Two or More (15%) (diversity index 48/100).
Counselor access is stretched at roughly 508 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance runs somewhat below the norm, with 21.3% of students chronically absent per the 2021-22 civil-rights collection.
The surrounding Ann Arbor Public Schools spends $17,642 per pupil, 31% above the Michigan average, a better-resourced district than most.
Among Ann Arbor's elementary schools, it stands alongside Logan Elementary School (349 students): Ann Arbor Open at Mack School is larger than that campus by headcount and runs heavier classes (15.4:1 vs 12.5:1).
Ann Arbor Public Schools also operates Huron High School (1,696 students) and Pioneer High School (1,671 students) alongside Ann Arbor Open at Mack School.
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 Ann Arbor Open at Mack School compares
Ann Arbor Open at Mack School on the metrics families compare, against Michigan and U.S. means.
| Metric | This school | vs Michigan | Michigan avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 15.4:1 | ▼ 12% | 17.5:1 | 15.7:1 |
| Free-lunch eligible | 10.3% | ▼ 81% | 54.3% | 51.7% |
| Enrollment | 508 | top 25% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
15.4:1
Leaner classes than 43% of US schools, a middle-of-the-pack class size.
508
Bigger than 63% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
10.3%
free-lunch eligible
- 81% below the Michigan average of 54.3%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
15.4:1
students per teacher
- 12% below state mean
Top 36% in Michigan - lower ratio than 64% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
21.3%
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
$17,642
per pupil, district-wide
- above Michigan avg of $13,507
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors1.0 FTE
Per 508 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 2 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.4 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 69.9%
Two or More 15.2%
Hispanic or Latino 8.5%
Asian 4.7%
African American 1.8%
Largest group: White at 69.9% of enrollment.
Student-body diversity index 47.9/100
Simpson diversity index - at 47.9, Ann Arbor Open at Mack School is more mixed than the Michigan school average of 36.2.
Programs
Funding & spending
District-wide per-pupil expenditure for Ann Arbor Public Schools, which includes Ann Arbor Open at Mack School.
$17,642
Per student
+31%
vs Michigan
Avg $13,507
+6%
vs U.S.
Avg $16,593
Revenue mix
Local 56.1%
State 34.4%
Federal 9.5%
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 Ann Arbor Open at Mack School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Huron High School | Larger | Higher economic need | Similar S:T ratio |
| Pioneer High School | Larger | Higher economic need | Similar S:T ratio |
| Skyline High School | Larger | Similar economic need | Similar S:T ratio |
| Slauson Middle School | Larger | Similar economic need | Higher S:T ratio |
| Clague Middle School | Larger | Similar economic need | Higher S:T ratio |
Comparisons are relative to Ann Arbor Open at Mack School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,696
- Students per teacher
- 15:1
- Resource Index
- 29/100
- Enrollment
- 1,671
- Students per teacher
- 16.2:1
- Resource Index
- 41/100
- Enrollment
- 1,237
- Students per teacher
- 16.1:1
- Resource Index
- 33/100
- Enrollment
- 729
- Students per teacher
- 19.2:1
- Resource Index
- 31/100
- Enrollment
- 696
- Students per teacher
- 18.3:1
- Resource Index
- 42/100
Similar elementary schools in Ann Arbor
2 comparable elementary schools (grades K-5) serving the same city.
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of Michigan, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~508 students)
Next steps
Verify locally before acting on Ann Arbor Open at Mack School's federal record.
- Compare Ann Arbor Open at Mack School against another school. Compare schools
- Ann Arbor Public Schools'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 Ann Arbor Open at Mack School
How many students attend Ann Arbor Open at Mack School?
Ann Arbor Open at Mack School has 508 students enrolled. It is an elementary school in Ann Arbor, MI.
What is the student-teacher ratio at Ann Arbor Open at Mack School?
The student-teacher ratio at Ann Arbor Open at Mack School is 15.4:1, which is 12% lower than the Michigan average of 17.5:1 and 2% 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 Ann Arbor Open at Mack School?
10.3% of students at Ann Arbor Open at Mack School are eligible for free lunch, compared to the Michigan average of 54.3%.
What is the racial and ethnic makeup of Ann Arbor Open at Mack School?
The largest demographic group at Ann Arbor Open at Mack School is White at 69.9% of enrollment, in Ann Arbor, MI.
What is the Resource Investment Index for Ann Arbor Open at Mack School?
Ann Arbor Open at Mack School has a Resource Investment Index of 29/100 (lower reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Ann Arbor Open at Mack School rank among elementary schools in Ann Arbor?
By Resource Investment Index, Ann Arbor Open at Mack School ranks #16 of 18 elementary schools in Ann Arbor, MI. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Ann Arbor on the city page.
Is Ann Arbor Open at Mack School a good school?
Ann Arbor Open at Mack School earns 29/100 on the Resource Investment Index, with class sizes near the Michigan 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 Ann Arbor Public Schools?
Besides Ann Arbor Open at Mack School, Ann Arbor Public Schools also operates Huron High School (1,696 students), Pioneer High School (1,671 students), and Skyline High School (1,237 students). See the Ann Arbor Public Schools district page for the complete list.
Related tools
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.