Serving 318 students in grades Kindergarten-5, Costano Elementary School ranks in the bottom 50% of all schools in California for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is ≤5% (which is lower than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 15% (which is lower than the California state average of 47%).
The student-teacher ratio of 18:1 is lower than the California state level of 21:1.
Minority enrollment is 98% of the student body (majority Hispanic), which is higher than the California state average of 80% (majority Hispanic).
Quick Facts (2026)
- Grades: Kindergarten-5
- Enrollment: 318 students
- Student-Teacher Ratio: 18:1
- Minority Enrollment: 98%
- Overall Testing Rank: Bottom 50% in CA
- Math Proficiency: ≤5% (Btm 50%)
- Reading Proficiency: 15% (Btm 50%)
- Science Proficiency: ≤5% (Btm 50%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Overview
Costano Elementary School's student population of 318 students has declined by 33% over five school years.
The teacher population of 18 teachers has declined by 25% over five school years.
Grades Offered
Grades Kindergarten-5
Total Students
318 students
Gender %
Total Classroom Teachers
18 teachers
Year Founded
1995
School Calendar
School Rankings
Costano Elementary School ranks within the bottom 50% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Costano Elementary School is 0.45, which is less than the diversity score at state average of 0.63. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#9334 out of 9523 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
≤5%
34%
Reading/Language Arts Test Scores (% Proficient)
15%
47%
Science Test Scores (% Proficient)
≤5%
29%
Student-Teacher Ratio
18:1
21:1
American Indian
n/a
1%
Asian
n/a
12%
Hispanic
72%
56%
Black
7%
5%
White
2%
20%
Hawaiian
16%
n/a
Two or more races
3%
6%
All Ethnic Groups
Eligible for Free Lunch
85%
54%
Eligible for Reduced Lunch (20-21)
3%
6%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
School Notes
- School Mascot: Cougars
Frequently Asked Questions
What is Costano Elementary School's ranking?
Costano Elementary School is ranked #9334 out of 9,523 schools, which ranks it among the bottom 50% of public schools in California.
What percent of students have achieved state testing proficiency in math and reading?
≤5% of students have achieved math proficiency (compared to the 34% CA state average), while 15% of students have achieved reading proficiency (compared to the 47% CA state average).
How many students attend Costano Elementary School?
318 students attend Costano Elementary School.
What is the racial composition of the student body?
72% of Costano Elementary School students are Hispanic, 16% of students are Hawaiian, 7% of students are Black, 3% of students are Two or more races, and 2% of students are White.
What is the student-teacher ratio of Costano Elementary School?
Costano Elementary School has a student ration of 18:1, which is lower than the California state average of 21:1.
What grades does Costano Elementary School offer ?
Costano Elementary School offers enrollment in grades Kindergarten-5
What school district is Costano Elementary School part of?
Costano Elementary School is part of Ravenswood City Elementary School District.
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