Census tract 6121, San Mateo County, CA: Opportunity Zone

Census tract 6121 in San Mateo County, California (GEOID 06081612100, 2010 boundaries) was designated a Qualified Opportunity Zone in 2018. That designation runs through December 31, 2028.

Is it still an Opportunity Zone in 2027?

Not yet known. 2 of the overlapping 2020 tracts are eligible for the 2027 round, but no official California nomination list naming them was published as of Oct 30, 2026.

What it means for property bought here

Under Notice 2026-40, property bought after December 31, 2026 for use in a 2018 zone generally cannot be Opportunity Zone business property unless the area is designated again or a transition exception applies: a working capital plan adopted by December 31, 2026 with at least 10% of the planned cash received and 5% spent, or ordinary-course replacement of existing property. Property acquired before the zone expires can keep counting as zone property through December 31, 2047. See the transition rules.

What overlaps it in the 2027 round

Census redrew tract lines in 2020, and the 2027 round uses 2020 tracts. These 2020 tracts overlap this 2018 zone (share of the 2020 tract's land inside it):

San Mateo County

San Mateo County had 4 Opportunity Zones in 2018 and has 25 census tracts eligible for the 2027 round.

• Tract 06081600200
• Tract 06081610201
• Tract 06081610500

Check an exact street address with the Opportunity Zone lookup, which places it in both its 2010 and 2020 tract. See all California Opportunity Zones.