Akashic EdgeAKASHIC EDGE
ElectionsCandidates
HistorianCartographer2026 ForecastArticlesAPIPricing

Latest Articles

    View all articles →

    Browse by Category

      Data Tools

      • Elections
      • Candidates
      • The Historian
      • The Cartographer
      • American Nations
      • States & Counties
      • Congressional Districts

      About

      Akashic HQ provides deep political data analysis covering 165 years of U.S. elections.

      • Data Sources & Methodology
      • Pricing
      • API Documentation
      • Contact

      © 2026 Akashic HQ. All rights reserved.

      Data: MIT Election Lab, VEST, Census Bureau
      Home/Elections/2024/US House/California/CA-21
      2024·US House·California·District profile →

      California District 21 US House

      Winner
      DEM
      Jim Costa
      52.6%102,798 votes
      Runner-up
      REP
      Michael Maher
      47.4%92,733 votes
      Margin
      D+5.2
      195,531 total votes
      2 candidates195,531 total votes
      CandidatePartyVotes ▼%Vote Share
      Jim CostaDEM✓
      		DEM102,79852.6%
      Michael MaherREP
      		REP92,73347.4%

      Presidential Vote by District

      5 elections · 2008–2024 · 118th Congress boundaries
      Latest (2024)D+3.8
      Shift vs 2020↓ R+16.5
      R+20EvenD+2020082012201620202024
      YearDem %Rep %MarginTurnout
      202450.6%46.8%D+3.8200,149
      202059.1%38.8%D+20.3226,362
      201658.2%36.5%D+21.8172,953
      201259.4%40.6%D+18.7152,341
      200857.8%41.4%D+16.4155,724

      Seat History

      US House in California

      2022
      Jim CostaDEM
      D+8.4
      Redistricted
      2020
      David G ValadaoREP
      R+0.9
      2018
      Tj CoxDEM
      D+0.8
      2016
      David G ValadaoREP
      R+13.5
      2014
      David G ValadaoREP
      R+15.7
      2012
      David G ValadaoREP
      R+15.5
      Redistricted
      2010
      Devin G NunesREP
      R+100.0
      2008
      Devin G NunesREP
      R+36.8
      2006
      Devin G NunesREP
      R+36.8
      2004
      Devin G NunesREP
      R+46.3
      2002
      Devin G NunesREP
      R+44.3
      Redistricted
      2000
      William M ThomasREP
      R+46.8
      1998
      William M ThomasREP
      R+78.9
      1996
      William M ThomasREP
      R+39.4
      View all US House history for California →

      Candidates

      Jim CostaDEM
      Record21W-0L
      Avg MarginD+38.3
      Career1978-2024
      US House / State Senate / State House
      Full profile →
      Michael MaherREP
      Record0W-2L
      Avg Margin---
      Career2022-2024
      US House
      Full profile →

      Also in California, 2024

      President1 contest →US Senate1 contest →
      ← All 2024 US House races2024 overviewCalifornia profileAll elections