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County rankings · Lowest proficiency

California: the counties with the lowest-performing public schools

55 counties

California public school districts ranked by the lowest enrollment-weighted state-assessment proficiency. Counties need at least 3 schools and 1,000 students to qualify.

#CountyStateSchoolsStudents% Proficient
1Lake CountyCA3810,16721.1%
2Mendocino CountyCA6312,73826.2%
3Glenn CountyCA216,25226.5%
4Del Norte CountyCA144,00327.0%
5Calaveras CountyCA225,26128.3%
6Plumas CountyCA132,04929.8%
7Colusa CountyCA214,73230.2%
8Merced CountyCA10759,45630.5%
9Madera CountyCA7632,25131.1%
10Siskiyou CountyCA436,05931.5%
11Tehama CountyCA4010,94831.5%
12Monterey CountyCA14073,84531.6%
13Lassen CountyCA223,75731.7%
14Yuba CountyCA4116,04531.9%
15Kern CountyCA271197,43132.6%
16Amador CountyCA144,05032.9%
17San Benito CountyCA2611,63333.5%
18Stanislaus CountyCA184106,47733.5%
19Mariposa CountyCA151,89333.9%
20Imperial CountyCA7236,51334.0%
21Solano CountyCA10460,76534.9%
22San Joaquin CountyCA243153,02635.1%
23Santa Barbara CountyCA12066,19135.3%
24Humboldt CountyCA9117,31935.4%
25Sutter CountyCA4323,78435.9%
26Tulare CountyCA192101,49435.9%
27San Bernardino CountyCA563393,64836.4%
28Inyo CountyCA192,53937.5%
29Napa CountyCA4018,55737.6%
30Riverside CountyCA513424,87237.7%
31Santa Cruz CountyCA7936,31638.3%
32Kings CountyCA6328,74239.3%
33Butte CountyCA8729,73039.4%
34Sonoma CountyCA17063,38939.5%
35Mono CountyCA111,44639.9%
36Tuolumne CountyCA255,72439.9%
37Sacramento CountyCA382259,34240.5%
38Fresno CountyCA352206,07241.2%
39Ventura CountyCA228147,84141.4%
40Yolo CountyCA6229,82042.6%
41Shasta CountyCA9026,63943.6%
42Los Angeles CountyCA2,1741,265,90745.5%
43Nevada CountyCA4113,56147.0%
44Trinity CountyCA171,46147.2%
45San Luis Obispo CountyCA8233,33947.5%
46Contra Costa CountyCA273167,42347.6%
47San Diego CountyCA749467,43748.4%
48San Francisco CountyCA12456,50550.6%
49Alameda CountyCA373210,51153.1%
50El Dorado CountyCA6734,70653.8%

See the national lowest proficiency ranking →