Compare California’s Congressional, Senate, and Assembly District Maps (2021 vs. 2026)

California’s congressional district boundaries are being updated under Proposition 50 (2025). These changes will shape how communities are represented in Congress beginning with the 2026 elections.

Use the interactive map below to compare the current 2021 maps with the new 2026 maps. This tool allows you to see how district lines are shifting — and how representation may change for your community.

How to Use the Map

• Slide to the left to view the 2026 district boundaries.

• Slide to the right to view the 2021 district boundaries.

• Zoom in to explore your city, neighborhood, or region.

• Click or tap a district to see its district number and general boundary area.

• Use the map layer menu to switch between:

  • Congressional Districts

  • State Senate Districts

  • State Assembly Districts

What to Look For

• Boundary changes that place communities in different districts

• Adjustments made to reflect population shifts

• Differences in district shape, size, and alignment

• Changes in the relationship between local, regional, and statewide representation

Note

Colors are for visual reference only and do not indicate political party affiliation or voting outcomes.