4. Happiness Hill Preschool in Castro Valley, CA, provides early childhood education and care for children ages 3-5 through nurturing and engaging programs.
Operator computes a Health score continuously. It is the one number that tells you if this shop is winning, losing, or steady. Here is how Happiness Hill Preschool broke down on May 9, 2026.
Operator ranks every preschool in Castro Valley continuously using reviews, response rate, and local market share.
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