- Enrollment
- 1,440
- Students per teacher
- 15.7:1
- Resource Index
- 34/100
High school (grades 9-12) · Bel Air, MD
Patterson Mill High School
Federal NCES profile for Patterson Mill High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 42/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 240039001638
👥 S:T ratio 37
🌟 Gifted program 70
🎓 Counselors 16
📋 Attendance 47
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Patterson Mill High School earns 42/100 on the Resource Investment Index, with class sizes near the Maryland median.
- #1 of 4
- high schools in Bel Air · Resource Index
- 42
- Resource Index · Typical
- 15.8:1
- students per teacher
- 21.9%
- free-lunch eligible
Patterson Mill High School has class sizes near the Maryland median. Computed live against every Maryland school reporting to NCES.
By Resource Investment Index, Patterson Mill High School ranks #1 of 4 high schools in Bel Air, MD.
School address
District: Harford County Public Schools · Maryland
NCES ID 240039001638 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
+7 students YoY
Patterson Mill High School held near 826 students from 2022-23 to 2023-24 (+7 headcount).
Teacher FTE lost 53.3 → 51.6 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
+7 students YoY 240039001638 · Bel Air, MD High · MID · TRAD
839 enr · 15.8:1 · 21.9% lunch · RII 42
Nearest enrollment peer: Edgewood High (1,440 students)
Patterson Mill High School held near 826 students from 2022-23 to 2023-24 (+7 headcount). Teacher FTE lost 53.3 → 51.6 across the same CCD years. Read with this school → · District book → · Maryland schools → · Find another →
Patterson Mill High School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Edgewood High
Edgewood High
1,440 students
- Aberdeen High
Aberdeen High
1,396 students
- Bel Air High
Bel Air High
1,341 students
- C. Milton Wrig
C. Milton Wright High
1,291 students
- North Harford
North Harford High
1,204 students
- This school
Patterson Mill High School
839 students
What this shows Patterson Mill High School reports 839 students on the CCD universe file.
How Patterson Mill High School compares
Patterson Mill High School held steady on CCD headcount: ratios and free-lunch share vs Maryland and U.S. means.
| Metric | This school | vs Maryland | Maryland avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 15.8:1 | ▲ 9% | 14.5:1 | 15.7:1 |
| Free-lunch eligible | 21.9% | ▼ 55% | 49.0% | 51.7% |
| Enrollment | 839 | top 20% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
15.8:1
Leaner classes than 40% of US schools, a middle-of-the-pack class size.
839
Bigger than 87% of US schools by enrollment, a large campus nationally.
Equity indicators methodology
Economic need
21.9%
free-lunch eligible
- 55% below the Maryland average of 49.0%
Below the 40% Title I threshold; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
15.8:1
students per teacher
- 9% above state mean
Top 67% in Maryland - lower ratio than 33% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
21.2%
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
$17,493
per pupil, district-wide
- below Maryland avg of $18,753
Close to the U.S. public-school average per-pupil spend.
Support staff
Counselors2.0 FTE
Per 420 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 18 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 2.1 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
White 67.8%
Hispanic or Latino 9.4%
African American 8.2%
Two or More 7.2%
Asian 6.8%
American Indian / Alaska Native 0.4%
Native Hawaiian / Pacific Islander 0.2%
Largest group: White at 67.8% of enrollment.
Student-body diversity index 51.5/100
Simpson diversity index - at 51.5, Patterson Mill High School is about as mixed as the Maryland school average of 52.3.
Programs
AP courses offered 21
Gifted & talented Yes
District finance for Harford County Public Schools reports $17,493 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Patterson Mill High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Edgewood High | Larger | Higher economic need | Similar S:T ratio |
| Aberdeen High | Larger | Higher economic need | Lower S:T ratio |
| Bel Air High | Larger | Similar economic need | Similar S:T ratio |
| C. Milton Wright High | Larger | Similar economic need | Similar S:T ratio |
| North Harford High | Larger | Similar economic need | Similar S:T ratio |
Comparisons are relative to Patterson Mill High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,396
- Students per teacher
- 13.8:1
- Resource Index
- 20/100
- Enrollment
- 1,341
- Students per teacher
- 14.7:1
- Resource Index
- 39/100
- Enrollment
- 1,291
- Students per teacher
- 15.4:1
- Resource Index
- 41/100
- Enrollment
- 1,204
- Students per teacher
- 16.3:1
- Resource Index
- 31/100
Similar high schools in Bel Air
3 comparable high schools (grades 9-12) serving the same city.
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~839 students)
Similar student-teacher ratio (~15.8:1)
Frequently asked questions about Patterson Mill High School
How many students attend Patterson Mill High School?
Patterson Mill High School has 839 students enrolled. It is a high school in Bel Air, MD. CCD year-over-year: 819 (2022-23) → 826 (2023-24), nearly flat (+7).
What is the student-teacher ratio at Patterson Mill High School?
The student-teacher ratio at Patterson Mill High School is 15.8:1, which is 9% higher than the Maryland average of 14.5:1 and 1% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Patterson Mill High School?
21.9% of students at Patterson Mill High School are eligible for free lunch, compared to the Maryland average of 49.0%.
What is the racial and ethnic makeup of Patterson Mill High School?
The largest demographic group at Patterson Mill High School is White at 67.8% of enrollment, in Bel Air, MD. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 51.5/100.
What is the Resource Investment Index for Patterson Mill High School?
Patterson Mill High School has a Resource Investment Index of 42/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Patterson Mill High School rank among high schools in Bel Air?
By Resource Investment Index, Patterson Mill High School ranks #1 of 4 high schools in Bel Air, MD. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all high schools in Bel Air on the city page.
What other schools are in Harford County Public Schools?
Besides Patterson Mill High School, Harford County Public Schools also operates Edgewood High (1,440 students), Aberdeen High (1,396 students), and Bel Air High (1,341 students). See the Harford County Public Schools district page for the complete list.