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Parents: what's one thing you'd want the Patterson Mill High School administration to hear?
Community prompt from u/allk12. Replies below.
Enrollment
839
High
DISTRICT 1,030 · STATE 1,185
SCHOOL COMMUNITY·HARFORD COUNTY PUBLIC SCHOOLS·NCES 240039001638
Patterson Mill High School
85 Patterson Mill Rd, Bel Air, MD 21015 · (410) 638-4640 · Harford County
GRADES 09–12HIGH22-SUBURBREGULAR SCHOOL839 STUDENTS
C+
allk12 Grade
Scored higher than 43% of Maryland public high schools
- B+Test scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- DBeats 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 Maryland public high schools
Student : Teacher
17.0:1
49 FTE teachers
DISTRICT 15.2:1 · STATE 15.3:1
Free / Reduced Lunch
24%
199 students
DISTRICT 41% · STATE 54%
Community
5
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 238 | 28% |
| Grade 10 | 220 | 26% |
| Grade 11 | 207 | 25% |
| Grade 12 | 174 | 21% |
Student demographics
51%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 61% · STATE 73% · 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
MCAP 2024-25 . % Proficient (Levels 3-4)English Language Arts
71.9%
MD avg 50.6% . +9.2pp since 2023
Math
18.0%
MD avg 34.8% . +0.9pp since 2023
What this means: On the MCAP, Maryland's statewide test, about 72 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 Maryland schools, those numbers are about 51 and 35. Reading and writing scores are up about 9 points since 2023, while math scores have held steady.
MCAP results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 71.9% | 18.0% |
| 2023-24 | 62.7% | 17.1% |
% Proficient (Levels 3-4), all students and all tested grades.
Source: MCAP. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
UNDERPERFORMING
Bottom 10% of MD schools after controlling for student poverty
Actual proficiency
42.4%
composite math + reading, all grades
Predicted
60.2%
based on MD schools with similar FRL share
Beats by
-17.8pp
below demographic expectation
What this means: About 42% of students here test proficient in math and reading, below the roughly 60% typical for Maryland schools with a similar share of low-income students. BeatsExpectations compares each school with others at the same poverty level, not by raw scores, so a school lands here when its results trail those comparable schools, which is not the same as having low scores. A higher-scoring school can still fall in this tier if similar schools score higher still.
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 Patterson Mill High School
Patterson Mill High School's state test result (42.4% proficient) is higher than 0 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Patterson Mill High School this school | 839 | 23.7% | 42.4% |
| Harford Technical High Bel Air | 954 | 20.9% | 50.1% |
| Century High Sykesville | 1,101 | 20.1% | 47.1% |
| South Carroll High Sykesville | 933 | 20.8% | 46.6% |
| Brunswick High Brunswick | 910 | 27.8% | 44.2% |
| Bel Air High Bel Air | 1,341 | 22.7% | 45.6% |
Matched among Maryland high 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 Patterson Mill High School ranks
Among high schools| Measure | This school | In Maryland | In Harford County |
|---|---|---|---|
| State test proficiency ranked highest first | 42.4% | #56 of 203 | #4 of 10 |
| Math proficiency ranked highest first | 18.0% | #47 of 206 ▲ 9 | #5 of 10 no change |
| Reading proficiency ranked highest first | 71.9% | #57 of 206 ▲ 23 | #4 of 10 no change |
| Enrollment ranked largest first | 839 | #161 of 234 | #9 of 10 |
| Students per teacher ranked fewest first | 17.0:1 | #139 of 210 | #10 of 10 |
| Diversity index ranked most diverse first | 51.5% | #118 of 211 | #6 of 10 |
| Free and reduced lunch ranked highest share first | 23.7% | #178 of 212 | #7 of 10 |
| Enrollment change since 2017-18 ranked steepest decline first | -0.1% | #76 of 76 | #6 of 6 |
Ranked against other public high 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
839
+3 (+0%) vs 2020
-13% since 2010-11, when it was 964
Student : Teacher
17.0:1
was 16.4:1
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 | 839 | 49.3 | 17.0:1 | 24% (199) |
| 2023-24 | 826 | 51.6 | 16.0:1 | 23% (194) |
| 2022-23 | 819 | 53.3 | 15.4:1 | 24% (198) |
| 2020-21 | 836 | 51 | 16.4:1 | 18% (151) |
| 2017-18 | 840 | 56.3 | 14.9:1 | 13% (105) |
| 2015-16 | 833 | 58 | 14.4:1 | 11% (92) |
| 2010-11 | 964 | 61 | 15.8:1 | 0% (0) |
Source: NCES Common Core of Data. Rows are the federal collections on file for Patterson Mill High School.
Since 2017-18: students unchanged (840 to 839); teachers down 12% (56.3 to 49.3).
About Patterson Mill High School
In Bel Air, Maryland, Patterson Mill High School is a small high school. Its grade span covers grades 9 through 12, with 839 students on the rolls. That compares with an average of about 1,185 students for high schools in Maryland.
Patterson Mill High School is among 55 schools run by Harford County Public Schools, which serves 37,771 students.
Federal enrollment data show Patterson Mill High School is 68% White. Enrollment also includes 9% Hispanic, 8% Black, 7% multiracial, and 7% Asian. A diversity index of 51% means there is a 51% chance two randomly chosen students at Patterson Mill High School are from different groups.
Patterson Mill High School has 49.3 full-time-equivalent teachers on staff and a student-to-teacher ratio of 17.0:1. The school's 17.0:1 compares with an average of 15.3:1 for high schools in Maryland. The school has 24% of students eligible for free or reduced-price lunch. That is lower than the 39% average for public schools in Harford County.
Patterson Mill High School holds a C+ allk12 Grade, placing it above 43% of Maryland public high schools.
When test results are adjusted for free or reduced-price lunch eligibility, Patterson Mill High School ranks in the bottom 10% of Maryland schools. It scores 42.4%; the prediction is 60.2%.
Looking at the county, Harford County, the median household earns about $112,265 a year, 40% of adults hold a bachelor's degree or higher, and about 5% of people live in poverty. Harford County has 55 public schools with about 37,771 students, including Patterson Mill High School.
Of the public schools around it, Patterson Mill High School is closest to Patterson Mill Middle School, less than a tenth of a mile away. There are at least 8 other public schools within five miles. Nearby schools average 59.4% on proficiency, and Patterson Mill High School is below that at 42.4%.
Patterson Mill High School falls in the Suburb: Mid-size locale category, used for schools in a suburban area outside a principal city, within an urbanized area with a population between 100,000 and 250,000.
Enrollment has been fairly stable: 836 in 2020-21 and 839 in 2024-25.
The allk12 page for Patterson Mill High School lets the school community talk about athletics, class schedules, and weather closures. You can also rate the school on this page.
Harford County at a glance
View full county profilePopulation
263,757
Census ACS
Median income
$112,265
Household, ACS
Bachelor's+
40%
Adults 25+
Poverty rate
5%
Below federal line
Schools in county
55
37,771 students
Quick facts
Related schools
Other schools in Harford County Public Schools
- Edgewood HighHigh · 1,440 students
- Aberdeen HighHigh · 1,396 students
- Bel Air HighHigh · 1,341 students
- C. Milton Wright HighHigh · 1,291 students
- North Harford HighHigh · 1,204 students
- Southampton MiddleMiddle · 1,192 students
Other schools in Bel Air
- Bel Air HighHigh · 1,341 students
- C. Milton Wright HighHigh · 1,291 students
- Southampton MiddleMiddle · 1,192 students
- Bel Air MiddleMiddle · 1,080 students
- Homestead/Wakefield ElementaryElementary · 1,071 students
- Harford Technical HighHigh · 954 students
Nearby schools
- Patterson Mill Middle School0.0 mi · 716
- Ring Factory Elementary0.6 mi · 541
- Emmorton Elementary1.4 mi · 584
- Homestead/Wakefield Elementary1.5 mi · 1,071
- Bel Air Middle1.8 mi · 1,080
- William S. James Elementary2.0 mi · 463
Frequently asked questions
About Patterson Mill High SchoolHow large is Patterson Mill High School?
Patterson Mill High School enrolls approximately 839 students in grades 09-12.
What grades does Patterson Mill High School serve?
Patterson Mill High School serves grades 09-12.
How many students per teacher at Patterson Mill High School?
Approximately 17.0:1 students per teacher at Patterson Mill High School.
What is the student diversity at Patterson Mill High School?
Student demographics at Patterson Mill High School are roughly 68% White, 9% Hispanic, 8% Black, 7% Asian, 7% Two or more.
What district is Patterson Mill High School in?
Patterson Mill High School is part of Harford County Public Schools.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.