State Cancer Profiles

Interpretation of Incidence Rates Data

Incidence Rate Report for California by County

Breast (Late Stage^), 2018-2022

All Races (includes Hispanic), Female, All Ages

Sorted by Percentlate

Explanation of Column Headers
Incidence Rate (95% Confidence Interval) - The incidence rate is based upon 100,000 people and is an annual rate (or average annual rate) based on the time period indicated. Rates are age-adjusted by 5-year age groups to the 2000 U.S. standard million population.

Percent of Cases with Late Stage - This is the number of late stages cases compared to the number of cases for all stages.

Other Notes

• Larger confidence intervals indicate less stability of the data. This is often due to low counts that are not quite low enough to be suppressed.
• Data is currently being suppressed if there are fewer than 16 counts for the time period.

Line by Line Interpretation of the Report

California⁷

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Rate : The incidence rate is 41.6 with a 95% confidence interval from 41.2 to 42.0 and 9,285 average annual cases over 2018-2022.
• CI*Rank ⋔ : N/A

US (SEER+NPCR)¹

• 2023 Rural-Urban Continuum Codes Φ : N/A
• Rate : The incidence rate is 42.4 with a 95% confidence interval from 42.3 to 42.5 and 83,714 average annual cases over 2018-2022.
• CI*Rank ⋔ : N/A

Siskiyou County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 28.2 with a 95% confidence interval from 19.2 to 39.9 and 8 average annual cases over 2018-2022.
• CI*Rank ⋔ : 53 (9, 53)
• Percent of Cases with Late Stage :

Plumas County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 29.2 with a 95% confidence interval from 16.1 to 49.2 and 4 average annual cases over 2018-2022.
• CI*Rank ⋔ : 52 (1, 53)
• Percent of Cases with Late Stage :

San Mateo County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 38.1 with a 95% confidence interval from 35.6 to 40.8 and 176 average annual cases over 2018-2022.
• CI*Rank ⋔ : 39 (21, 48)
• Percent of Cases with Late Stage :

Shasta County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 38.4 with a 95% confidence interval from 33.2 to 44.3 and 45 average annual cases over 2018-2022.
• CI*Rank ⋔ : 38 (8, 51)
• Percent of Cases with Late Stage :

Kings County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 31.0 with a 95% confidence interval from 24.9 to 38.1 and 19 average annual cases over 2018-2022.
• CI*Rank ⋔ : 50 (25, 53)
• Percent of Cases with Late Stage :

Placer County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 40.1 with a 95% confidence interval from 36.6 to 43.8 and 107 average annual cases over 2018-2022.
• CI*Rank ⋔ : 33 (10, 47)
• Percent of Cases with Late Stage :

San Francisco County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 37.7 with a 95% confidence interval from 35.2 to 40.3 and 182 average annual cases over 2018-2022.
• CI*Rank ⋔ : 42 (24, 48)
• Percent of Cases with Late Stage :

Marin County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 46.0 with a 95% confidence interval from 41.3 to 51.1 and 84 average annual cases over 2018-2022.
• CI*Rank ⋔ : 10 (1, 37)
• Percent of Cases with Late Stage :

Tuolumne County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 37.5 with a 95% confidence interval from 28.9 to 48.1 and 17 average annual cases over 2018-2022.
• CI*Rank ⋔ : 43 (2, 53)
• Percent of Cases with Late Stage :

Santa Barbara County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 42.5 with a 95% confidence interval from 38.7 to 46.6 and 101 average annual cases over 2018-2022.
• CI*Rank ⋔ : 20 (5, 43)
• Percent of Cases with Late Stage :

Nevada County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 43.4 with a 95% confidence interval from 35.9 to 52.2 and 32 average annual cases over 2018-2022.
• CI*Rank ⋔ : 15 (1, 50)
• Percent of Cases with Late Stage :

Butte County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 40.7 with a 95% confidence interval from 35.5 to 46.4 and 51 average annual cases over 2018-2022.
• CI*Rank ⋔ : 31 (4, 49)
• Percent of Cases with Late Stage :

San Luis Obispo County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 43.0 with a 95% confidence interval from 38.4 to 48.1 and 77 average annual cases over 2018-2022.
• CI*Rank ⋔ : 18 (3, 44)
• Percent of Cases with Late Stage :

Sutter County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 36.5 with a 95% confidence interval from 29.6 to 44.6 and 21 average annual cases over 2018-2022.
• CI*Rank ⋔ : 45 (5, 53)
• Percent of Cases with Late Stage :

Mariposa County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 46.6 with a 95% confidence interval from 28.6 to 72.2 and 6 average annual cases over 2018-2022.
• CI*Rank ⋔ : 8 (1, 53)
• Percent of Cases with Late Stage :

Sonoma County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 45.6 with a 95% confidence interval from 42.2 to 49.3 and 148 average annual cases over 2018-2022.
• CI*Rank ⋔ : 12 (2, 32)
• Percent of Cases with Late Stage :

Amador County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 40.4 with a 95% confidence interval from 29.4 to 54.8 and 12 average annual cases over 2018-2022.
• CI*Rank ⋔ : 32 (1, 53)
• Percent of Cases with Late Stage :

Contra Costa County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 43.9 with a 95% confidence interval from 41.7 to 46.2 and 311 average annual cases over 2018-2022.
• CI*Rank ⋔ : 13 (6, 30)
• Percent of Cases with Late Stage :

Calaveras County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 43.1 with a 95% confidence interval from 32.5 to 56.4 and 15 average annual cases over 2018-2022.
• CI*Rank ⋔ : 17 (1, 52)
• Percent of Cases with Late Stage :

El Dorado County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 46.4 with a 95% confidence interval from 40.9 to 52.6 and 59 average annual cases over 2018-2022.
• CI*Rank ⋔ : 9 (1, 40)
• Percent of Cases with Late Stage :

Orange County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 41.1 with a 95% confidence interval from 39.8 to 42.5 and 771 average annual cases over 2018-2022.
• CI*Rank ⋔ : 28 (16, 37)
• Percent of Cases with Late Stage :

Santa Cruz County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 47.0 with a 95% confidence interval from 42.1 to 52.3 and 75 average annual cases over 2018-2022.
• CI*Rank ⋔ : 6 (1, 33)
• Percent of Cases with Late Stage :

Tehama County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 38.4 with a 95% confidence interval from 30.0 to 48.6 and 16 average annual cases over 2018-2022.
• CI*Rank ⋔ : 37 (2, 53)
• Percent of Cases with Late Stage :

Mendocino County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 36.4 with a 95% confidence interval from 29.4 to 44.6 and 23 average annual cases over 2018-2022.
• CI*Rank ⋔ : 46 (6, 53)
• Percent of Cases with Late Stage :

Stanislaus County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 41.3 with a 95% confidence interval from 38.0 to 44.8 and 121 average annual cases over 2018-2022.
• CI*Rank ⋔ : 26 (8, 44)
• Percent of Cases with Late Stage :

Sacramento County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 41.2 with a 95% confidence interval from 39.3 to 43.2 and 370 average annual cases over 2018-2022.
• CI*Rank ⋔ : 27 (13, 39)
• Percent of Cases with Late Stage :

Alameda County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 42.0 with a 95% confidence interval from 40.1 to 43.9 and 402 average annual cases over 2018-2022.
• CI*Rank ⋔ : 22 (11, 36)
• Percent of Cases with Late Stage :

Santa Clara County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 42.1 with a 95% confidence interval from 40.3 to 43.9 and 447 average annual cases over 2018-2022.
• CI*Rank ⋔ : 21 (11, 36)
• Percent of Cases with Late Stage :

Ventura County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 46.9 with a 95% confidence interval from 44.2 to 49.8 and 237 average annual cases over 2018-2022.
• CI*Rank ⋔ : 7 (2, 22)
• Percent of Cases with Late Stage :

Fresno County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 38.5 with a 95% confidence interval from 36.1 to 41.1 and 192 average annual cases over 2018-2022.
• CI*Rank ⋔ : 36 (20, 47)
• Percent of Cases with Late Stage :

Riverside County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 38.6 with a 95% confidence interval from 37.1 to 40.2 and 519 average annual cases over 2018-2022.
• CI*Rank ⋔ : 35 (26, 45)
• Percent of Cases with Late Stage :

San Diego County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 43.9 with a 95% confidence interval from 42.5 to 45.3 and 801 average annual cases over 2018-2022.
• CI*Rank ⋔ : 14 (8, 26)
• Percent of Cases with Late Stage :

Madera County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 33.1 with a 95% confidence interval from 27.7 to 39.1 and 28 average annual cases over 2018-2022.
• CI*Rank ⋔ : 48 (24, 53)
• Percent of Cases with Late Stage :

Napa County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 48.9 with a 95% confidence interval from 42.3 to 56.3 and 43 average annual cases over 2018-2022.
• CI*Rank ⋔ : 4 (1, 38)
• Percent of Cases with Late Stage :

Yuba County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 32.1 with a 95% confidence interval from 24.6 to 41.2 and 13 average annual cases over 2018-2022.
• CI*Rank ⋔ : 49 (12, 53)
• Percent of Cases with Late Stage :

Los Angeles County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 41.7 with a 95% confidence interval from 40.9 to 42.5 and 2,381 average annual cases over 2018-2022.
• CI*Rank ⋔ : 24 (17, 34)
• Percent of Cases with Late Stage :

Colusa County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 43.4 with a 95% confidence interval from 27.5 to 65.2 and 5 average annual cases over 2018-2022.
• CI*Rank ⋔ : 16 (1, 53)
• Percent of Cases with Late Stage :

Solano County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 45.5 with a 95% confidence interval from 41.8 to 49.5 and 124 average annual cases over 2018-2022.
• CI*Rank ⋔ : 11 (2, 33)
• Percent of Cases with Late Stage :

Tulare County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 36.1 with a 95% confidence interval from 32.6 to 39.8 and 81 average annual cases over 2018-2022.
• CI*Rank ⋔ : 47 (24, 51)
• Percent of Cases with Late Stage :

Inyo County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 41.0 with a 95% confidence interval from 27.0 to 60.9 and 6 average annual cases over 2018-2022.
• CI*Rank ⋔ : 29 (1, 53)
• Percent of Cases with Late Stage :

Yolo County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 51.1 with a 95% confidence interval from 45.1 to 57.7 and 55 average annual cases over 2018-2022.
• CI*Rank ⋔ : 2 (1, 24)
• Percent of Cases with Late Stage :

San Benito County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 40.8 with a 95% confidence interval from 31.7 to 51.8 and 14 average annual cases over 2018-2022.
• CI*Rank ⋔ : 30 (1, 52)
• Percent of Cases with Late Stage :

Monterey County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 41.9 with a 95% confidence interval from 38.2 to 46.0 and 96 average annual cases over 2018-2022.
• CI*Rank ⋔ : 23 (5, 45)
• Percent of Cases with Late Stage :

San Joaquin County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 41.7 with a 95% confidence interval from 38.9 to 44.7 and 170 average annual cases over 2018-2022.
• CI*Rank ⋔ : 25 (9, 42)
• Percent of Cases with Late Stage :

Lake County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 47.3 with a 95% confidence interval from 37.9 to 58.4 and 21 average annual cases over 2018-2022.
• CI*Rank ⋔ : 5 (1, 48)
• Percent of Cases with Late Stage :

Merced County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 39.3 with a 95% confidence interval from 34.6 to 44.5 and 51 average annual cases over 2018-2022.
• CI*Rank ⋔ : 34 (8, 50)
• Percent of Cases with Late Stage :

Kern County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 38.0 with a 95% confidence interval from 35.4 to 40.8 and 161 average annual cases over 2018-2022.
• CI*Rank ⋔ : 40 (22, 49)
• Percent of Cases with Late Stage :

Lassen County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 37.2 with a 95% confidence interval from 23.9 to 55.4 and 6 average annual cases over 2018-2022.
• CI*Rank ⋔ : 44 (1, 53)
• Percent of Cases with Late Stage :

San Bernardino County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 42.9 with a 95% confidence interval from 41.2 to 44.7 and 483 average annual cases over 2018-2022.
• CI*Rank ⋔ : 19 (9, 33)
• Percent of Cases with Late Stage :

Imperial County⁷

• 2023 Rural-Urban Continuum Codes Φ : Urban
• Rate : The incidence rate is 37.7 with a 95% confidence interval from 32.1 to 44.0 and 34 average annual cases over 2018-2022.
• CI*Rank ⋔ : 41 (8, 52)
• Percent of Cases with Late Stage :

Glenn County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 51.0 with a 95% confidence interval from 36.2 to 69.9 and 8 average annual cases over 2018-2022.
• CI*Rank ⋔ : 1 (1, 52)
• Percent of Cases with Late Stage :

Humboldt County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 49.6 with a 95% confidence interval from 42.7 to 57.4 and 41 average annual cases over 2018-2022.
• CI*Rank ⋔ : 3 (1, 36)
• Percent of Cases with Late Stage :

Del Norte County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate : The incidence rate is 30.3 with a 95% confidence interval from 18.3 to 47.1 and 5 average annual cases over 2018-2022.
• CI*Rank ⋔ : 51 (2, 53)
• Percent of Cases with Late Stage :

Alpine County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate :
• CI*Rank ⋔ : *
• Percent of Cases with Late Stage : *

Modoc County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate :
• CI*Rank ⋔ : *
• Percent of Cases with Late Stage : *

Mono County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate :
• CI*Rank ⋔ : *
• Percent of Cases with Late Stage : *

Sierra County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate :
• CI*Rank ⋔ : *
• Percent of Cases with Late Stage : *

Trinity County⁷

• 2023 Rural-Urban Continuum Codes Φ : Rural
• Rate :
• CI*Rank ⋔ : *
• Percent of Cases with Late Stage : *

Notes:
Created by statecancerprofiles.cancer.gov on 03/12/2026 5:14 am.

State Cancer Registries may provide more current or more local data.



† Incidence rates (cases per 100,000 population per year) are age-adjusted to the 2000 US standard population (SEER areas use 20 age groups and NPCR areas use 19 age groups). Rates are for invasive cancer only (except for bladder cancer which is invasive and in situ) or unless otherwise specified. Rates calculated using SEER*Stat. Population counts for denominators are based on Census populations as modified by NCI. The US Population Data File is used for SEER and NPCR incidence rates.

Rates are computed using cancers classified as malignant based on ICD-O-3. For more information see malignant.html.

^ Late Stage is defined as cases determined to be regional or distant. Due to changes in stage coding, Combined Summary Stage with Expanded Regional Codes (2004+) is used for data from Surveillance, Epidemiology, and End Results (SEER) databases and Merged Summary Stage is used for data from National Program of Cancer Registries databases. Due to the increased complexity with staging, other staging variables maybe used if necessary.

⋔ Results presented with the CI*Rank statistics help show the usefulness of ranks. For example, ranks for relatively rare diseases or less populated areas may be essentially meaningless because of their large variability, but ranks for more common diseases in densely populated regions can be very useful. The rates used in CI*Rank are all age-adjusted to the 2000 US standard population using 19 age groups for SEER and NPCR areas. More information about methodology can be found on the CI*Rank website.

Φ Rural–urban county classifications are based on the 2023 USDA Rural–Urban Continuum Codes (except for Connecticut Counties which use 2013 codes). State-level cancer rates for rural areas are calculated using cancer cases registered exclusively in rural counties, while state-level cancer rates for urban areas are calculated using cases registered exclusively in urban counties.

¹ Source: National Program of Cancer Registries and Surveillance, Epidemiology, and End Results SEER*Stat Database - United States Department of Health and Human Services, Centers for Disease Control and Prevention and National Cancer Institute. Based on the 2024 submission.

⁷ Source: SEER November 2024 submission.

* Data has been suppressed to ensure confidentiality and stability of rate estimates. Counts are suppressed if fewer than 16 records were reported in a specific area-sex-race category.

Data for United States does not include Puerto Rico.