Old Mill School is one of 5 public elementary schools in Mill Valley, California, along with Park, Tamalpais Valley, Edna Maguire, and Strawberry Point Schools. The main building, built in 1921, is the oldest existing public elementary school building in Mill Valley.
Serving 251 students in grades Kindergarten-5, Old Mill Elementary School ranks in the top 1% of all schools in California for overall test scores (math proficiency is top 1%, and reading proficiency is top 1%).
The percentage of students achieving proficiency in math is 85-89% (which is higher than the California state average of 34%). The percentage of students achieving proficiency in reading/language arts is 85-89% (which is higher than the California state average of 47%).
The student-teacher ratio of 21:1 is equal to the California state level of 21:1.
Minority enrollment is 28% of the student body (majority Hispanic), which is lower than the California state average of 80% (majority Hispanic).
Quick Facts (2026)
- Grades: Kindergarten-5
- Enrollment: 251 students
- Student-Teacher Ratio: 21:1
- Minority Enrollment: 28%
- Overall Testing Rank: Top 1% in CA
- Math Proficiency: 85-89% (Top 1%)
- Reading Proficiency: 85-89% (Top 5%)
- Science Proficiency: 70-79% (Top 5%)
- Source: National Center for Education Statistics (NCES), CA Dept. of Education
Top Rankings
Old Mill Elementary School ranks among the top 20% of public schools in California for:
Category
Attribute
Overall Rank
Math Proficiency
Reading/Language Arts Proficiency
Science Proficiency
School Overview
Old Mill Elementary School's student population of 251 students has declined by 9% over five school years.
The teacher population of 12 teachers has declined by 7% over five school years.
Grades Offered
Grades Kindergarten-5
Total Students
251 students
Gender %
Total Classroom Teachers
12 teachers
Year Founded
1921
School Rankings
Old Mill Elementary School ranks within the top 1% of all 9,523 schools in California (based off of combined math and reading proficiency testing data).
The diversity score of Old Mill Elementary School is 0.44, 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
#59 out of 9523 schools
(Top 1%)
(Top 1%)
Math Test Scores (% Proficient)
85-89%
34%
Reading/Language Arts Test Scores (% Proficient)
85-89%
47%
Science Test Scores (% Proficient)
70-79%
29%
Student-Teacher Ratio
21:1
21:1
American Indian
n/a
1%
Asian
1%
12%
Hispanic
6%
56%
Black
n/a
5%
White
72%
20%
Hawaiian
n/a
n/a
Two or more races
21%
6%
All Ethnic Groups
Eligible for Free Lunch
4%
54%
Eligible for Reduced Lunch (10-11)
1%
8%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), CA Dept. of Education
Frequently Asked Questions
What is Old Mill Elementary School's ranking?
Old Mill Elementary School is ranked #59 out of 9,523 schools, which ranks it among the top 1% of public schools in California.
What schools are Old Mill Elementary School often compared to?
Old Mill Elementary Schoolis often viewed alongside schools like Park Elementary School, Edna Maguire Elementary School by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
85-89% of students have achieved math proficiency (compared to the 34% CA state average), while 85-89% of students have achieved reading proficiency (compared to the 47% CA state average).
How many students attend Old Mill Elementary School?
251 students attend Old Mill Elementary School.
What is the racial composition of the student body?
72% of Old Mill Elementary School students are White, 21% of students are Two or more races, 6% of students are Hispanic, and 1% of students are Asian.
What is the student-teacher ratio of Old Mill Elementary School?
Old Mill Elementary School has a student ration of 21:1, which is equal to the California state average of 21:1.
What grades does Old Mill Elementary School offer ?
Old Mill Elementary School offers enrollment in grades Kindergarten-5
What school district is Old Mill Elementary School part of?
Old Mill Elementary School is part of Mill Valley Elementary School District.
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