Billy Demartini

Billy Demartini is a real estate agent with Earth Real Estate in San Mateo. MLS records credit Billy with 1 transaction over the last 12 months, worth $550,000 in total sales volume. Across both sides of the deal, that is an average of $550,000 per transaction.

All of Billy's MLS activity in this period is on the listing side, representing sellers: 1 listing transaction for $550,000, or $550,000 on average.

By sales volume, Billy ranks 178th of the 187 agents in San Mateo with recorded sales, ahead of 5 percent of them. The typical agent there closed 2 transactions worth $2.5 million.

Statewide, Billy is 102566th by volume among 115,589 California agents with recorded sales.

In ZIP code 94402, the address on Billy's MLS record, the median sold price was $2,610,000 across 27 sales between June 2026 and July 2026. Billy's average transaction of $550,000 is below that median, so much of the work is in the more affordable part of the market.

Billy is listed with Earth Real Estate, San Mateo. No other agent shares that office record in our data.

These other San Mateo agents also have recorded sales in the last 12 months. They are ranked by sales volume. Compare a few before you pick someone to interview.

• Laura Bryant35 transactions · 106.7M volume
• Joe Polyak26 transactions · 40.8M volume
• Rumana Jabeen21.5 transactions · 38.8M volume
• Rob Decontreras8 transactions · 35M volume
• Christopher Eckert19 transactions · 32.1M volume
• Gillian Kilroy12 transactions · 24.8M volume

The numbers on this page come from public MLS and license records, last updated May 2026. Transaction counts and dollar volumes cover the last 12 months and are credited to the agent named on each record. Billy has not claimed this profile, and a listing here does not mean Billy or Earth Real Estate endorses or is affiliated with Expert Agents Near Me. We collect no reviews, so there are no ratings from us on this page.