San Mateo County, California — 2026 Loan Limits & Market Data

San Mateo County is a major population center in California with a population of approximately 742,893 residents spread across 449 square miles. The county is a densely populated urban area with 1,655 residents per square mile, which shapes both the local housing market and the types of properties available to buyers.

As a designated high-cost area, San Mateo County has elevated 2026 conforming loan limits of $1,249,125 for a single-family home, higher than the national baseline of $832,750. FHA borrowers can access loans up to $1,249,125. These higher limits reflect the area's elevated home values and allow more buyers to use conventional financing rather than jumbo loans, which typically require larger down payments and stricter qualification criteria.

Given San Mateo County's urban density, buyers should expect competitive market conditions with a diverse mix of single-family homes, condominiums, and multi-family properties. The county spans 31 ZIP codes, each with its own micro-market dynamics affecting pricing, inventory levels, and days on market. Exploring individual ZIP codes below can help identify neighborhoods that match specific budget and lifestyle preferences.