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- Deaths are roughly linear with confirmed cases on a log scale
- By March 24th the following counties were already observing deaths: Santa Clara (SCL), Riverside (RIV), San Jose (SJ), Sacramento (SAC), LA County, Orange County.
- By June 25th:
- In terms of confirmed cases and deaths per 1 Million county population
- The leading counties were Lake (LAK), Nevada (NEV), Mono (MNO) with Imperial (IMP) catching up since the end of May.
- These are followed by LA County (LA), Orange Country (OR), Kings County (KIN), Tuolumne (TUO) and Riverside (RIV).
- If one just takes the number of cases (i.e. do not normalize by the population of the county) then:
- The leading counties are LA County (LA), Orange County (OR), Lake County (LAK), Nevada County (Nevada), Riverside (RIV), San Diego County (SD) and San Bernadino County (SBD)
- In general, the counties with lower per capita income appear to have lower numbers of confirmed cases and deaths, The exceptions are Lake County (LAK), Imperial County (IMP), Kern County (KER), Tuolumne County (TUO) and Fremont County (FRE).
- In terms of confirmed cases and deaths per 1 Million county population
- By July 20:
- LA county, Orange county (ORA), Lake, Riverside (RIV), San Diego (SD) and San Bernadino (SBD) counties by July 20 had a clear lead in deaths and confirmed cases.
- By this time LA county had almost four times the deaths of the next highest (Orange) county and almost three times the confirmed cases.
- The following counties still had zero deaths:
| County | ID | Covid-19 confirmed | deaths | Population() |
| Alpine | ALP | 2 | 0 | 1202 |
| Amador | AMA | 57 | 0 | 37159 |
| Calaveras | CAL | 87 | 0 | 44921 |
| Colusa | COL | 223 | 0 | 21424 |
| El Dorado | ED | 443 | 0 | 181465 |
| Lassen | LAS | 512 | 0 | 33356 |
| Plumas | PLU | 24 | 0 | 19286 |
| Sierra | SIE | 22 | 0 | 3019 |
| Siskiyou | SIS | 50 | 0 | 44261 |
| Trinity | TRI | 104 | 0 | 13515 |
| Tuolumne | TUO | 101 | 0 | 54347 |
- Imperial county with a population of 177K had 8606 cases and 163 deaths, this compares with El Dorado county with a population of 181K that had 443 cases and 0 deaths.
The following were the leading counties in terms of deaths/population
County ID Confirmed Deaths Population Deaths/population Mono MNO 918 6 14193 0.0004 Orange ORA 68274 1212 3086331 0.0004 Tulare TUL 6896 167 451108 0.0004 Los Angeles LA 159045 4104 9974203 0.0004 Imperial IMP 8606 163 177026 0.0009 Nevada NEV 37058 655 98606 0.0066 Lake LAK 39192 887 64209 0.0138 The following were the leading counties in terms of deaths/confirmed cases:
County ID Deaths/confirmed % Population Inyo INY 2.5 18439 San Mateo SM 2.5 739837 Humboldt HUM 2.56 134876 Los Angeles LA 2.58 9974203 Mariposa MPA 2.63 17946 Yolo YOL 2.84 204162 Shasta SHA 2.89 178520