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#5141 of 9,533 schools in CA

Delta Keys Charter

School · New Jerusalem Elementary

31400 South Koster Rd., Lathrop, CA 95330

Charter

Enrollment

125

Student-Teacher

20.8:1

Score

6.2

Grades

Kindergarten – 12th

Updated 2022-23

How this school compares

In Lathrop

#4 of 5

public schools

California schools

#181 of 475

In district

#2 of 5

New Jerusalem Elementary

Academic growth

9.5 / 10

Exceptional

About Delta Keys Charter

Delta Keys Charter is a charter school located in Lathrop, California, within the San Joaquin County. The school covers kindergarten through twelfth grade and has an enrollment of 125 students with a student-teacher ratio of 20.8:1. Delta Keys Charter focuses on providing education to a smaller community setting, offering personalized attention due to its low number of full-time equivalent teachers.

The academic performance at Delta Keys Charter shows room for improvement, with the school ranking in the 21st percentile among all California schools and an average ELA/Reading proficiency rate of 15% and Math proficiency rate of 8%. Despite these challenges, the school is committed to student development and continuous improvement. Delta Keys Charter is situated in a rural area near the town of Lathrop.

The setting provides a close-knit community where students can benefit from a supportive environment that fosters growth and learning outside of traditional urban settings.

What Parents Should Know

With an enrollment of 125 students, Delta Keys Charter is a smaller school where families often find a close-knit community atmosphere. Smaller settings can mean more individual attention from teachers and staff, though they may offer fewer extracurricular options than larger schools.

While current test scores at Delta Keys Charter are below average, the school shows strong growth metrics — meaning students are making above-average progress year over year. This upward trajectory can be a positive indicator for families who value a school's ability to help students improve, even if absolute scores haven't caught up yet.

The student-teacher ratio at Delta Keys Charter is 20.8:1, which is higher than the national average. This may mean larger class sizes, so parents should ask about classroom support, teaching assistants, and how the school differentiates instruction for students who need extra help.

Score Breakdown

Full Profile · 4/4 metrics
Student Progress9.5Exceptional25%
Year-over-year improvement in student test scores.
View breakdown
Years of Data3
Annual Change+1.36 pts/yr
Data Period2019–2024
TrendImproving
Academics2.7Needs Improvement25%
Student proficiency on state tests, adjusted for community poverty levels.
View breakdown
Math Proficiency12.5%
Reading/ELA Proficiency15.6%
Math vs. State Avg-15.5 pts
Reading vs. State Avg-40.3 pts
Overall Proficiency14%
Expected (poverty-adj.)32%
vs. Expected-17.5 pts
Adjusted Percentile9th
College Readiness6.5Above Average30%
Graduation rates, AP course participation, and IB availability.
View breakdown
IB ProgramNo
Resources & Environment5.9Average20%
Student-teacher ratio, per-pupil spending, and attendance.
View breakdown
Student-Teacher Ratio20.8:1
Per-Pupil Spending$12,454

Delta Keys Charter — Students at Delta Keys Charter score 14% proficient, which is below what's typical for similar communities (expected: 32%).

How we calculate scores →

Equity & Diversity

Shown separately, not included in overall score

Free/Reduced Lunch

76%

Students qualifying for federal meal assistance

Test Scores CA CAASPP (2023-24)

Math Proficiency 8.1%
School
State
31.8%
ELA Proficiency 14.6%
School
State
51.5%

Based on 8 test records from CA state assessments. About our data

Proficiency Trend

↑ Improving

Average proficiency (% at or above grade level) across Math & ELA over time.

2019
Math
2.5%
ELA
12%
2021*
Math
5%
ELA
15%
2024
Math
12.5%
ELA
15.6%

* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.

Source: EdFacts (NCES) and state assessment data. Growth score: 9.5/10.

How Delta Keys Charter Compares

See how Delta Keys Charter performs across key quality dimensions compared to state benchmarks.

Overall Score
6.2/10
46th percentile in CA
Academic
2.7/10
2.7/10
Growth
9.5/10
Above average
Environment
5.9/10
Above average

Funding & Resources

Free/Reduced Lunch
Students eligible for subsidized meals
76%
Teaching Staff
21:1 student-teacher ratio
6 teachers

Location

31400 South Koster Rd., Lathrop, CA 95330

Nearby Alternatives

Families considering Delta Keys Charter may also want to explore other schools in the area. Delta Charter (rated 7.1/10, in nearby Tracy), which scores slightly higher. Another option is Valley View Charter Prep (rated 6.9/10, in nearby Sacramento), which scores slightly higher. Additionally, Delta Home Charter (rated 5.7/10, in nearby Tracy), with a comparable rating. For more schools in Lathrop, see our Lathrop schools guide .

Nearby Schools

20 within 7.3 mi
School Distance Rating
Valley View Charter Prep Sacramento 0.0 mi 6.9
New Jerusalem Elementary Tracy 0.0 mi
Delta Charter Tracy 0.0 mi 7.1
New Jerusalem Tracy 0.0 mi 4.1
Delta Home Charter Tracy 0.0 mi 5.7
Delta Charter Online Lathrop 0.0 mi 5.0
Rising Sun Patterson 4.4 mi
Jefferson Tracy 4.4 mi 8.0
Tom Hawkins Elementary Tracy 5.8 mi 6.8
Banta Charter Tracy 6.7 mi 3.5
Banta Elementary Tracy 6.7 mi 5.5
MONTESSORI ELEMENTARY & MIDDLE SCHOOL OF TRACY Tracy 6.1 mi 7.1
Louis A. Bohn Elementary Tracy 6.7 mi 7.4
Gladys Poet-Christian Elementary Tracy 6.7 mi 4.0
Grace Mennonite School Winton 7.0 mi
Tracy High Tracy 7.3 mi 6.1
Monticello Elementary Tracy 6.9 mi 7.3
Nile Garden Elementary Manteca 7.6 mi 4.7
Anthony C. Traina Elementary Tracy 6.8 mi 6.7
South/West Park Elementary Tracy 7.3 mi 8.2

Neighborhood Census ACS (2019-2023)

Census data for ZIP 95330 (ACS 2019-2023 5-Year Estimates) · Data sources

Median Income

$118,461

Median Home Value

$605,100

Median Rent

$2,341/mo

Population

33,015

College Educated

23.9%

Homeownership

83.6%

Avg Commute

43.6 min

Poverty Rate

8.5%

Median Age

34.2

Community Profile

The community surrounding Delta Keys Charter has a median household income of $118,461. It is a community where 24% of adults hold a bachelor's degree or higher. The median home value in the area is $605,100, with a median rent of $2,341/month. The local poverty rate of 8.5% is relatively low. The average commute in the area is 44 minutes, which is above the national average. Source: U.S. Census ACS 2022 5-Year Estimates.

Similar Schools

Schools in the same state with comparable level, size, and ratings

School Rating
APPLE VALLEY CHRISTIAN ACADEMY Apple Valley, CA 6.2
ATLAS Learning Academy Lincoln, CA 6.2
CALVARY CHRISTIAN SCHOOL Hollister, CA 6.2
NEW COVENANT ACADEMY Los Angeles, CA 6.2
PLACER LEARNING CENTER Granite Bay, CA 6.2
Riverside County Juvenile Court Riverside, CA 6.2

Frequently Asked Questions

Common questions about Delta Keys Charter

What grades does Delta Keys Charter serve?

Delta Keys Charter serves students in grades Kindergarten through 12th.

How many students attend Delta Keys Charter?

Delta Keys Charter has an enrollment of approximately 125 students.

What is the student-teacher ratio at Delta Keys Charter?

The student-teacher ratio at Delta Keys Charter is 20.8:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.

How does Delta Keys Charter rank in CA?

Delta Keys Charter is ranked #5141 out of 9,533 schools in CA.

What is Delta Keys Charter's MySchoolScout rating?

Delta Keys Charter has a composite rating of 6.2 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.

What are the test scores at Delta Keys Charter?

Based on the most recent state assessment data, Delta Keys Charter has 8.1% math proficiency and 14.6% reading/ELA proficiency.

Is Delta Keys Charter a charter school?

Yes, Delta Keys Charter is a charter school. Charter schools are publicly funded but independently operated, often with more flexibility in curriculum and teaching methods.

Is Delta Keys Charter a Title I school?

No, Delta Keys Charter is not currently a Title I school.

What does the Free & Reduced Lunch percentage mean for Delta Keys Charter?

76.0% of students at Delta Keys Charter qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.

11 schools nearby View map →

Neighborhood Context

City Safety
High (1,741/100K)

FBI UCR 2024. City-level (Lathrop). Data >1 year old.

Quick Facts NCES CCD (SY 2022-23)

Grades
Kindergarten – 12th
Enrollment
125
Student-Teacher Ratio
20.8:1
Teachers (FTE)
6
Free/Reduced Lunch
76.0%
Type
regular
Setting
Fringe Rural
County
San Joaquin County
Data Year
2023–2024

District

New Jerusalem Elementary
District Enrollment
1,643
Schools in District
6
Per-Pupil Spending
$16,186
District Rank
#2 of 5

How We Rate Schools

Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.

Read our full methodology

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