No Party Preference (113,804) outnumbers Republicans (111,657). The purple swing bloc is the whole ballgame — it's why purple is the loudest color on this map.
Dot size = city population (bigger dot = more people). The registration overlays use real city data; unincorporated communities show as hollow grey — California publishes party registration for incorporated cities only.
Toggle the Alameda crossover layer to see exactly where the ~1-in-10 Alameda slice sits.
| DeSaulnier (D) | 132,246 | 59.7% |
| Frese (R) ✅ | 28,671 | 12.9% |
| Piccinini (R) | 25,487 | 11.5% |
| Griffiths (R) | 14,767 | 6.7% |
| 3 other Democrats | 20,410 | 9.2% |
✓ Certified — CA Secretary of State Statement of Vote, June 2, 2026 primary. County-level.
Income/age/education aren't tabulated on the new lines — city overlays use Census ACS; district income ~$128k / age 40.5 / 44% college (Contra Costa proxy). The voting-eligible population is whiter (57.6%) than residents.
Boundary: CA GIS (Prop 50, GEOID 0610). District & city registration: CA SoS Report of Registration, May 18 2026 (incorporated cities only — unincorporated not published). Primary: CA SoS certified Statement of Vote, June 2026. Demographics: CA SDMG + Census ACS 5-yr.
City lean is qualitative; income top-coded at $250k; Port Costa/Byron figures directional; San Leandro is mostly in CA-12 (shown for reference).
Paid for by Frese For Congress.