Redistricting California (Part 2): State Senate

Here is my attempt at redistricting the California State Senate. With over 936,000 people per district, satisfying communities of interest becomes a bit more challenging. Here are the districts I ended up drawing.

Majority-White: 22

Majority-Hispanic: 8

Majority-Minority: 10

Safe Dem: 19

Likely Dem: 1

Lean Dem: 3

Toss-Up: 7

Lean GOP: 3

Likely GOP: 6

Safe GOP: 1

Outer NorCal


SD-01: Coastal NorCal (Previously SD-02) (Noreen Evans)

Description: Similar shape to the old district, plus added Del Norte County and the westernmost part of Solano to satisfy district size

Demographics: 68.4% White, 16.1% Hispanic, 5.6% Asian

2008 President: Obama 69.1%, McCain 28.5% (SAFE DEM: D+16)

SD-02: Central Valley and Yolo County (Previously SD-04) (Doug LaMalfa and Lois Wolk unless she moves to the new SD-05)

Description: Similar to previous configuration only I added Yolo County to satisfy population size. Lois Wolk (from Davis and currently in SD-05) would be put into this district and would lose to LaMalfa unless she moved to the new SD-05.

Demographics: 71.8% White, 16.1% Hispanic, 5.5% Asian

2008 President: McCain 49.9%, Obama 47.9% (LEAN GOP: R+4)

SD-03: All of Marin, eastern San Francisco, and SE Sonoma (Mark Leno)

Demographics: 56.4% White, 17.8% Asian, 15.6% Hispanic, 6.7% Black

2008 President: Obama 82.2%, McCain 15.8% (SAFE DEM: D+29)

SD-04: Mountain counties along most of the Nevada border plus some Sacramento suburbs (Previously SD-01) (Ted Gaines)

Demographics: 80.8% White, 10.0% Hispanic

2008 President: McCain 54.1%, Obama 44.9% (LIKELY GOP: R+8)

SD-05: Most of Solano and Sacramento, NW San Joaquin (Lois Wolk if she moves here from SD-02)

Description: Removed Yolo and included more of Sacramento

Demographics: 59.5% White, 18.2% Hispanic, 10.2% Asian, 7.2% Black

2008 President: Obama 53.4%, McCain 44.9% (TOSS-UP: EVEN)

SD-06: Sacramento and some inner suburbs (Darrell Steinberg)

Demographics: 50.3% White, 17.9% Hispanic, 14.2% Asian, 11.8% Black

2008 President: Obama 65.1%, McCain 33.0% (SAFE DEM: D+12)

San Francisco Bay Area


SD-07: Oakland, Berkeley, Richmond, Martinez (Previously SD-09) (Loni Hancock)

Demographics: 36.0% White, 24.2% Black, 18.5% Hispanic, 16.7% Asian

2008 President: Obama 86.7%, McCain 11.3% (SAFE DEM: D+33)

SD-08: Western half of San Francisco, most of San Mateo (Leland Yee)

Demographics: 46.4% White, 27.6% Asian, 18.3% Hispanic

2008 President: Obama 75.4%, McCain 22.8% (SAFE DEM: D+22)

SD-09: Inland Alameda and Contra Costa (Previously SD-07) (Mark DeSaulnier)

Demographics: 67.9% White, 14.5% Hispanic, 9.3% Asian

2008 President: Obama 63.0%, McCain 35.3% (SAFE DEM: D+10)

SD-10: Western Alameda County and Milpitas in Santa Clara County (Ellen Corbett)

Demographics: 32.9% White, 31.4% Asian, 24.6% Hispanic, 6.1% Black

2008 President: Obama 72.7%, McCain 25.4% (SAFE DEM: D+20)

SD-11: Silicon Valley and Santa Cruz County (Joe Simitian)

Demographics: 58.4% White, 20.2% Asian, 15.9% Hispanic

2008 President: Obama 73.7%, McCain 24.2% (SAFE DEM: D+21)

SD-12: San Jose and part of Stanislaus County (Previously SD-13) (Elaine Alquist)

Demographics: 42.4% White, 31.0% Hispanic, 19.6% Asian

2008 President: Obama 67.4%, McCain 30.9% (SAFE DEM: D+14)

SD-13: Stockton, Modesto, Merced (Previously SD-12) (Anthony Cannella)

Demographics: 50.0% White, 34.1% Hispanic, 6.8% Asian

2008 President: Obama 52.1%, McCain 46.2% (TOSS-UP: R+1)



SD-14: Eastern Central Valley and northern half of Fresno (Tom Berryhill)

Demographics: 57.9% White, 28.7% Hispanic, 5.6% Asian

2008 President: McCain 53.6%, Obama 44.7% (LIKELY GOP: R+8)

SD-15: Central Coast (Sam Blakeslee)

Description: Still a Central Coast-centric district, only I removed Santa Cruz, put Monterey completely within the district, and stretched a little further into Santa Barbara

Demographics: 55.1% White, 33.9% Hispanic

2008 President: Obama 57.0%, McCain 41.0% (LEAN DEM: D+4)

SD-16: Western Central Valley (Michael Rubio)

Description: Did some tweaking to keep it sufficiently Hispanic to satisfy the VRA

Demographics: 60.1% Hispanic, 24.6% White, 5.9% Asian, 5.8% Black

2008 President: Obama 55.6%, McCain 42.8% (TOSS-UP: D+2.5)

SD-17: Inyo County, Tulare, Bakersfield (Previously SD-18) (Jean Fuller)

Demographics: 57.0% White, 32.1% Hispanic

2008 President: McCain 60.8%, Obama 37.4% (SAFE GOP: R+15)

SD-18: Remainder of Santa Barbara and most of Ventura (Previously SD-19) (Tony Strickland)

Description: This time I was able to keep Thousand Oaks and Simi Valley in the same district and not go over in population

Demographics: 58.5% White, 31.0% Hispanic, 5.5% Asian

2008 President: Obama 59.3%, McCain 38.9% (LEAN DEM: D+6)

SD-19: Antelope Valley, keeping Lancaster and Palmdale together (Previously SD-17) (Sharon Runner)

Demographics: 54.1% White, 27.2% Hispanic, 8.2% Asian, 6.8% Black

2008 President: Obama 53.3%, McCain 44.6% (TOSS-UP: EVEN)

Los Angeles/Orange County


SD-20: Hispanic side of the San Fernando Valley (Alex Padilla)

Demographics: 54.2% Hispanic, 30.4% White, 6.9% Asian

2008 President: Obama 73.2%, McCain 24.7% (SAFE DEM: D+20)

SD-21: Burbank, Glendale, Pasadena (Carol Liu)

Demographics: 37.2% White, 32.8% Hispanic, 20.0% Asian, 5.2% Black

2008 President: Obama 67.3%, McCain 30.6% (SAFE DEM: D+14)

SD-22: From Monterey Park to Diamond Bar (Kevin De Leon)

Demographics: 53.9% Hispanic, 26.0% Asian, 14.8% White

2008 President: Obama 64.9%, McCain 33.2% (SAFE DEM: D+12)

SD-23: West Side L.A. without the Ventura portion (Fran Pavley)

Demographics: 70.4% White, 13.0% Hispanic, 9.4% Asian

2008 President: Obama 72.9%, McCain 25.4% (SAFE DEM: D+20)

SD-24: South Central: Culver City, Inglewood, Compton (Previously parts of SD-25 and 26) (Rod Wright) (Curren Price)

Description: Due to demographic trends, it looks like the black populations of the current SD-25 and 26 will be merged into this district, which means Curren Price and Rod Wright will likely be in the same district.

Demographics: 41.8% Hispanic, 41.7% Black, 7.9% White, 5.8% Asian

2008 President: Obama 89.7%, McCain 9.1% (SAFE DEM: D+37)

SD-25: South Central (Previously parts of SD-25 and 26)

Description: Here I took the Hispanic parts of the current SD-25 and 26. Either of Wright or Price may run here, but an Hispanic candidate is far and away the favorite here

Demographics: 61.4% Hispanic, 14.0% Black, 11.4% Asian, 10.4% White

2008 President: Obama 84.2%, McCain 13.8% (SAFE DEM: D+31)

SD-26: Downtown L.A., Whittier, Pico Rivera (Previously SD-24) (Probably Ed Hernandez)

Description: Hernandez’s home is in the new SD-22, though he may move and run here.

Demographics: 79.0% Hispanic, 11.4% White, 5.6% Asian

2008 President: Obama 73.1%, McCain 24.8% (SAFE DEM: D+20)

SD-27: Beach Cities, Carson, and Palos Verdes Peninsula (Previously SD-28) (Ted Lieu)

Demographics: 39.3% White, 31.7% Hispanic, 16.4% Asian, 8.9% Black

2008 President: Obama 62.0%, McCain 36.0% (LIKELY DEM: D+9)

SD-28: South Gate, Norwalk, Artesia, part of Long Beach (Previously parts of SD-27 and SD-30) (possibly Alan Lowenthal and Ron Calderon)

Description: I shifted Long Beach to the coastal OC district and found that I had too many people in that one, so I shifted part of Long Beach into this district. Part of Lowenthal’s and Calderon’s districts are put here, so they may face a primary unless one decides to retire.

Demographics: 55.7% Hispanic, 18.2% White, 12.3% Asian, 10.9% Black

2008 President: Obama 70.9%, McCain 27.0% (SAFE DEM: D+18)

SD-29: Northern L.A. suburbs (Previously parts of SD-29 and SD-31) (Bob Dutton and Bob Huff?)

Description: In L.A. and San Bern Counties to satisfy population size, from Arcadia to my hometown Rancho Cucamonga. Huff’s home in Diamond Bar was shifted to the 22nd so he may move here.

Demographics: 43.8% White, 34.3% Hispanic, 9.3% Asian, 8.9% Black

2008 President: Obama 54.2%, McCain 43.8% (TOSS-UP: D+1)

SD-30: Fontana, Ontario, Chino, Montclair, Pomona (Previously SD-32) (Gloria Negrete-McLeod)

Demographics: 55.7% Hispanic, 25.0% White, 9.9% Black, 6.2% Asian

2008 President: Obama 63.7%, McCain 34.5% (SAFE DEM: D+10)

SD-31: Most of San Bernardino and in Riverside (Open)

Demographics: 64.2% White, 23.9% Hispanic, 5.2% Black

2008 President: McCain 55.2%, Obama 42.6% (LIKELY GOP: R+9)

SD-32: Coastal Orange County and part of Long Beach (Previously SD-35 and part of SD-27) (Tom Harman and Alan Lowenthal?)

Demographics: 69.3% White, 13.5% Hispanic, 12.6% Asian

2008 President: Obama 49.5%, McCain 48.6% (LEAN GOP: R+4)

SD-33: Garden Grove, Anaheim, Santa Ana (Previously SD-34) (Lou Correa)

Demographics: 54.2% Hispanic, 23.5% White, 17.5% Asian

2008 President: Obama 54.6%, McCain 43.5% (TOSS-UP: D+1)

SD-34: Inland Orange County (Previously SD-33) (Mimi Walters)

Demographics: 53.7% White, 27.2% Hispanic, 13.9% Asian

2008 President: McCain 53.1%, Obama 45.0% (LIKELY GOP: R+7)

SD-35: Riverside, Norco, Moreno Valley, Corona (Previously part of SD-37) (Open)

Description: Rapid growth in Riverside County led to this district being excised off the eastern end of the old SD-37

Demographics: 43.0% White, 38.3% Hispanic, 9.2% Black, 5.6% Asian

2008 President: Obama 55.4%, McCain 42.7% (TOSS-UP: D+2)

Outer SoCal and San Diego



SD-36: Most of the rest of Riverside County (Previously SD-37) (Bill Emmerson)

Demographics: 53.7% White, 36.9% Hispanic

2008 President: McCain 49.6%, Obama 48.8% (LEAN GOP: R+3)

SD-37: Temecula, Southern OC, NW San Diego County to Carlsbad (Previously SD-36) (Joel Anderson?)

Demographics: 66.4% White, 21.4% Hispanic, 5.6% Asian

2008 President: McCain 53.5%, Obama 44.7% (LIKELY GOP: R+7)

SD-38: Imperial County and as much of Eastern San Diego as could fit (Previously SD-37 and SD-40) (Mark Wyland)

Demographics: 57.8% White, 31.2% Hispanic

2008 President: McCain 53.2%, Obama 45.1% (LIKELY GOP: R+7)

SD-39: Northern San Diego (Christine Kehoe)

Description: Northern half of San Diego, Solana Beach, Encinitas, Del Mar, Lemon Grove

Demographics: 63.2% White, 14.9% Hispanic, 13.7% Asian

2008 President: Obama 56.9%, McCain 41.4% (LEAN DEM: D+4)

SD-40: Southern San Diego (Previously part of SD-39) (Juan Vargas)

Description: Southern half of San Diego, Coronado, National City, Chula Vista, Imperial Beach

Demographics: 42.4% Hispanic, 32.5% White, 12.0% Asian, 9.4% Black

2008 President: Obama 66.3%, McCain 32.0% (SAFE DEM: D+13)

19 thoughts on “Redistricting California (Part 2): State Senate”

  1. On a side note, they need to expand the State Senate or combine it with teh State House to make 120 seats.

    I can see the Dems holding no less than their 25-15 majority with this map, so long as demographics continue to go their way, especially in 2012.

  2. but how do you justify splitting San Francisco? I believe that the commission will draw a map without reference to the current one or where senators reside. Other than following the current map, I can see no possible reason for that.

  3. Did you correct for the issues in population distribution and (especially) demographic data in the California “Custom Data”?, or is this just as it appears in the app after you click that button?

  4. This looks like a map that may actually come out of the Prop 11/Prop 20 Commission! It may scare some incumbents in both parties, but these are the new rules and they will have to learn how to actually campaign and not take voters for granted.

  5. CA-3: Very strange split of San Francisco, which ought to stay as one city.

    CA-5: This has a weird arm stretching into Stockton, and another weird one stretching into the Sacramento suburbs. It ought to be compacted.

    CA-9: Very nice.

    CA-11: I’m somewhat dubious about attaching San Jose to Monterey; I personally wouldn’t make that decision.

    CA-13: I don’t understand why the district is shaped that strangely, especially since it isn’t VRA.

    CA-16: Try adding the eastern part of Kern County, which makes the district a lot more compact.

    CA-19: I really don’t like the idea of combining Los Angeles suburbs with the Lancaster/Palmdale area. I would much rather go north than south with that district.

    CA-25: Could be more compact.

    CA-28: Same, and why does it randomly stretch into Long Beach?

    CA-29: This looks dubious and non-compact. The communities do have a lot in common, so I guess you could defend it that way.

    CA-37: I’d try keeping it entirely in San Diego and Orange County.

  6. Where’d you get 936,000 per SD? 37,253,956 2010 (us census) /40 = 931,348

    Admittedly, the state senate surely has to be at the limits of what can be called “representative” democracy.

  7. CA-22: Ed Hernandez represents most of the area and does live here.

    CA-26: Kevin DeLeon probably represents the L.A portion, but most of it seems to be in the 25th.

  8. SD-29 would definitely not pass the compactness test, but with such a high size for the districts, it’s hard to know where to put some places.

    936,000 is such an incredibly high number, I really think it is time for the state to look at a unicameral legislature. Good representation is hard to achieve in such large constituencies.

  9. I think Yolo county belongs with the rest of the Sacramento area, not with the ag-dominated counties north of it. West Sac is right across the river from Sac, Woodland is a commuter town, Davis is a college/commuter town, and the rest of it is pretty empty. I would swap it with Modoc, Lassen, Plumas, Sierra, Nevada, and that piece of Butte in your district 4, making 4 a competitive district instead of a red one. Alternately you could stick Yolo in 5 with Solano to make an I-80 corridor district, although that would make 5 a boring blue district and 4 a boring red one. 2 would be a deep red district in any case.  

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