Diamond Bar Montessori Academy · Preschool, Diamond Bar
Diamond Bar Montessori Academy is a licensed child care center in Diamond Bar, CA, licensed for up to 118 children and serving preschool-age children. It has held its California license since 2016. Since February 2021, state licensing staff have inspected it 3 times. The state issued 1 citation, which was not Type A. It came more than 12 months ago. Measured by weighted citations per inspection, it is tied for #5 of 19 centers in Diamond Bar and has fewer citations per inspection than 54% of California licensed centers.
Inspection record
Every state visit
What inspectors cited most
Citations, newest first
Based on record review, the licensee did not comply with the section cited above in 8 children were not signed in - 2 in room #2 and 6 in room #4 which poses/posed a potential health, safety or personal rights risk to persons in care.
About this center
Other licenses at this address
Common questions
Does Diamond Bar Montessori Academy take infants?
Not under this license, which covers preschool-age children. An infant center is licensed separately at the same address (listed below).
Has Diamond Bar Montessori Academy had any serious violations?
No Type A citations since 2021. It has 1 Type B citation, listed above.
How does Diamond Bar Montessori Academy compare with other daycares in Diamond Bar?
It is tied for #5 of 19 centers in Diamond Bar by weighted citations per inspection, and has fewer citations per inspection than 54% of California licensed centers with enough inspection history to compare.
When was Diamond Bar Montessori Academy last inspected?
Oct 17, 2025. No citations were issued during that visit.
How much does Diamond Bar Montessori Academy cost?
California does not publish individual centers’ prices, so ask Diamond Bar Montessori Academy for its current tuition. For comparison, the median full-time price at licensed centers in Los Angeles County, which includes Diamond Bar, was $1,087 a month for preschoolers (about $1,370 today) in the state’s 2021 Regional Market Rate Survey.
Who runs Diamond Bar Montessori Academy?
The licensee is Sunland Diamond Bar Montessori INC, and the administrator listed with the state is Hissanka S. Gunasekara.
Licensed centers nearby
23555 Palomino Dr, Diamond Bar · under 0.1 mi away · 24 spots No citations Diamond Bar Community Preschool
400 South Rancheria Road, Diamond Bar · 0.3 mi away · 36 spots About typical Limai Montessori Academy
23377 Golden Springs Drive, Diamond Bar · 0.4 mi away · 102 spots No citations Golden Springs Child Development Center, Rm. 29
245 S. Ballena Dr., Diamond Bar · 0.5 mi away · 15 spots About typical Mt. Calvary Lutheran Preschool & Day Care Center
23300 East Golden Springs Dr., Diamond Bar · ZIP 91765 away · 72 spots More citations than most Mt. Calvary Lutheran Preschool and Day Care
23300 Golden Springs Dr, Diamond Bar · ZIP 91765 away · 20 spots More citations than most
Citations are quoted from California Department of Social Services inspection and complaint reports. Type A citations are the state’s most serious category (an immediate risk to children’s health, safety or personal rights); Type B citations are a potential risk. A citation is a finding about one rule, not a judgment about a center overall. Complaint allegations appear here only when the state substantiated them.
To read the full state reports, search facility number 198019047 on the California Care Facility Search. Data refreshed Oct 3, 2026.
Comparing centers? See how to choose a daycare: 30 questions to ask and a printable checklist.