Less compact than 82% of other congressional districts.
78th least compact of 429 nationally, 22nd of 52 in California.
A score describes shape, not intent. Coastlines, rivers and the Voting Rights Act can all make a district irregular. How scores work
The three measures
Polsby-Popper
0.15at least as compact as 19% of districts on this measure
Area compared with perimeter. Low for jagged or snaking edges.
Reock
0.45at least as compact as 40% of districts on this measure
Area compared with the smallest circle around the district, counting only land. Low for stretched shapes.
Convex hull
0.60at least as compact as 10% of districts on this measure
Area compared with a rubber band stretched around the district, counting only land. Low for bites and tentacles.
Each measure runs from 0 to 1, where 1 is a perfect circle or a shape with no dents.
Who lives here
Most of this district's voting-age residents are Hispanic or Latino (55.4%). The Voting Rights Act can require districts that keep a minority community together so it can elect candidates it prefers, and those districts can be irregular on purpose. A district like this isn't necessarily drawn for that reason, and the site doesn't know whether this one was. Figures are from the 2020 Census. How these are counted
New lines for 2026
California used a different map in the 2026 election than in 2024: the 2025 Proposition 50 map (legislature-drawn; voter-approved). Source: California Secretary of State
Cities and towns
The largest places with people in this district, from the 2020 Census. A place split between districts shows how many of its residents live in this one.
Ontariocityall 175,265 residents
Fontanacity108,028 of its 208,393 residents
Pomonacity79,949 of its 151,713 residents
Chino Hillscityall 78,411 residents
Coronacity76,002 of its 157,136 residents
Eastvalecityall 69,757 residents
Uplandcity38,789 of its 79,040 residents
Claremontcityall 37,266 residents
Norcocityall 26,316 residents
Bloomingtoncommunityall 24,339 residents
And 3 smaller places. 3% of this district's people live outside any city, town or named community. How places are counted
ZIP codes
23 ZIP codes have residents in this district. 18 of them are split with other districts. A percentage is the share of that ZIP code's 2020 residents who live here.
91708
91709 (99%)
91710 (4%)
91711 (99%)
91730 (12%)
91750 (1%)
91752 (30%)
91761
91762 (95%)
91763 (5%)
91764
91766 (5%)
91767
91768 (70%)
91786 (70%)
92316 (76%)
92335 (95%)
92336 (2%)
92337
92860 (99%)
92879 (70%)
92880 (97%)
92882 (42%)
These are the Census Bureau's ZIP code areas, which match residential ZIP codes closely. ZIP codes used only for PO boxes or a single organization aren't included. How ZIP codes are matched
2024 presidential vote
California drew new lines for 2026, and no 2024 results have been published for them. Where the votes come from
U.S. House
Norma J. Torres, Democrat
Elected November 3, 2026, takes office January 3, 2027.
Unofficial results from the California Secretary of State, checked November 6, 2026. A race shows a winner once news decision desks have called it. Results become official when the state certifies them. Where this comes from
California's senators
Alex Padilla, Democrat
Adam B. Schiff, Democrat
Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from
Where it sits in California
CA-01
Irregularity score 69
Less compact than 74% of districts
29th least compact of 52 in California
11% of its border is the state's edge
New lines for 2026
CA-02
Irregularity score 75
Less compact than 79% of districts
25th least compact of 52 in California
56% of its border is the state's edge
New lines for 2026
CA-03
Irregularity score 56
Less compact than 59% of districts
40th least compact of 52 in California
New lines for 2026
CA-04
Irregularity score 75
Less compact than 80% of districts
24th least compact of 52 in California
New lines for 2026
CA-05
Irregularity score 48
Less compact than 49% of districts
45th least compact of 52 in California
30% of its border is the state's edge
New lines for 2026
CA-06
Irregularity score 91
Less compact than 96% of districts
5th least compact of 52 in California
New lines for 2026
CA-07
Irregularity score 85
Less compact than 89% of districts
13th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-08
Irregularity score 71
Less compact than 76% of districts
28th least compact of 52 in California
13% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-09
Irregularity score 92
Less compact than 96% of districts
4th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-10
Irregularity score 43
Less compact than 42% of districts
49th least compact of 52 in California
New lines for 2026
CA-11
Irregularity score 48
Less compact than 50% of districts
44th least compact of 52 in California
78% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-12
Irregularity score 21
Less compact than 15% of districts
52nd least compact of 52 in California
51% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-13
Irregularity score 60
Less compact than 64% of districts
36th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-14
Irregularity score 35
Less compact than 31% of districts
51st least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-15
Irregularity score 54
Less compact than 57% of districts
41st least compact of 52 in California
43% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-16
Irregularity score 77
Less compact than 82% of districts
21st least compact of 52 in California
25% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-17
Irregularity score 47
Less compact than 47% of districts
47th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-18
Irregularity score 62
Less compact than 67% of districts
34th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-19
Irregularity score 98
Less compact than 100% of districts
1st least compact of 52 in California
27% of its border is the state's edge
New lines for 2026
CA-20
Irregularity score 82
Less compact than 88% of districts
14th least compact of 52 in California
New lines for 2026
CA-21
Irregularity score 79
Less compact than 85% of districts
19th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-22
Irregularity score 87
Less compact than 91% of districts
10th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-23
Irregularity score 37
Less compact than 33% of districts
50th least compact of 52 in California
23% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-24
Irregularity score 48
Less compact than 49% of districts
46th least compact of 52 in California
54% of its border is the state's edge
New lines for 2026
CA-25
Irregularity score 66
Less compact than 71% of districts
32nd least compact of 52 in California
21% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-26
Irregularity score 68
Less compact than 73% of districts
31st least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-27
Irregularity score 87
Less compact than 91% of districts
11th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-28
Irregularity score 62
Less compact than 66% of districts
35th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-29
Irregularity score 53
Less compact than 56% of districts
43rd least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-30
Irregularity score 82
Less compact than 87% of districts
15th least compact of 52 in California
New lines for 2026
CA-31
Irregularity score 78
Less compact than 83% of districts
20th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-32
Irregularity score 68
Less compact than 73% of districts
30th least compact of 52 in California
16% of its border is the state's edge
New lines for 2026
CA-33
Irregularity score 90
Less compact than 95% of districts
6th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-34
Irregularity score 71
Less compact than 77% of districts
27th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-35
Irregularity score 77
Less compact than 82% of districts
22nd least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-36
Irregularity score 90
Less compact than 95% of districts
7th least compact of 52 in California
30% of its border is the state's edge
New lines for 2026
CA-37
Irregularity score 44
Less compact than 44% of districts
48th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-38
Irregularity score 96
Less compact than 98% of districts
2nd least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-39
Irregularity score 80
Less compact than 86% of districts
17th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-40
Irregularity score 57
Less compact than 61% of districts
39th least compact of 52 in California
New lines for 2026
CA-41
Irregularity score 90
Less compact than 95% of districts
8th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-42
Irregularity score 63
Less compact than 67% of districts
33rd least compact of 52 in California
64% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-43
Irregularity score 74
Less compact than 79% of districts
26th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-44
Irregularity score 88
Less compact than 92% of districts
9th least compact of 52 in California
11% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-45
Irregularity score 87
Less compact than 91% of districts
12th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-46
Irregularity score 79
Less compact than 85% of districts
18th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-47
Irregularity score 59
Less compact than 63% of districts
37th least compact of 52 in California
16% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
CA-48
Irregularity score 81
Less compact than 87% of districts
16th least compact of 52 in California
Majority-minority (2020 voting-age population)
New lines for 2026
CA-49
Irregularity score 59
Less compact than 63% of districts
38th least compact of 52 in California
23% of its border is the state's edge
New lines for 2026
CA-50
Irregularity score 94
Less compact than 96% of districts
3rd least compact of 52 in California
12% of its border is the state's edge
New lines for 2026
CA-51
Irregularity score 75
Less compact than 80% of districts
23rd least compact of 52 in California
New lines for 2026
CA-52
Irregularity score 54
Less compact than 57% of districts
42nd least compact of 52 in California
35% of its border is the state's edge
Majority-minority (2020 voting-age population)
New lines for 2026
Very compact (0 to 19)
Compact (20 to 39)
Middle (40 to 59)
Irregular (60 to 79)
Very irregular (80 to 100)
The area outlined with dashes on the map, enlarged so its smaller districts can be seen.