Type 1 diabetes in California
T1D Index estimates for 2025 · United States
An estimated 158,669 people are living with type 1 diabetes in California in 2025. Each year about 5,350 people are newly diagnosed and 1,140 people with T1D die. A further 32,606 people would be alive today had they not died early from type 1 diabetes.
People living with T1D
158,669
New diagnoses in 2025
5,350
Deaths in 2025
1,140
Missing people
32,606
Expected age at death, 10-year-old with T1D
70.0years
How many people have type 1 diabetes in California?
158,669 people in California are living with type 1 diabetes in 2025, or 389.0 per 100,000 people. That is lower than the United States average of 435.7 per 100,000 and higher than the global average of 115.5. California has the largest number of people living with T1D of the 50 states and the District of Columbia.
For every 100 people living with T1D in California, another 21 are missing: people who would be alive today had they not died early from T1D.
How many children and young people have type 1 diabetes in California?
20,122 people younger than 20 were living with type 1 diabetes in California in 2024 (95% CI, 19,388–20,827), out of 154,949 people of all ages. About 20.6 in every 100,000 people younger than 20 were newly diagnosed that year, lower than the national rate of 24.0. These 2024 figures and their confidence intervals are published in JAMA Network Open.
| 2024 | California | 95% CI | United States |
|---|---|---|---|
| People living with T1D, all ages | 154,949 | 149,979–159,964 | 1,476,859 |
| People living with T1D, younger than 20 | 20,122 | 19,388–20,827 | 196,778 |
| New diagnoses per 100,000 people younger than 20 | 20.6 | 18.1–23.6 | 24.0 |
| Pediatric endocrinologists per 1,000 people younger than 18 with T1D | 11.8 | 11.3–12.2 | 10.1 |
Cite as: Wang F, Haynes A, Dabelea D, et al. Type 1 diabetes incidence and prevalence in the US. JAMA Netw Open. 2026;9(8):e2627732. doi:10.1001/jamanetworkopen.2026.27732. Download the table for every state (CSV).
Is type 1 diabetes increasing in California?
The number of people living with T1D in California went from 77,082 in 2000 to 158,669 in 2025, and is projected to rise to 210,396 by 2040 (+33%).
| Year | Living with T1D | New diagnoses | Deaths | Missing people |
|---|---|---|---|---|
| 2000 | 77,082 | 3,515 | 1,093 | 23,965 |
| 2010 | 107,307 | 4,370 | 921 | 27,728 |
| 2020 | 143,571 | 5,172 | 1,469 | 30,698 |
| 2025 | 158,669 | 5,350 | 1,140 | 32,606 |
| 2030 (projected) | 177,120 | 6,176 | 1,594 | 34,512 |
| 2040 (projected) | 210,396 | 6,244 | 1,852 | 39,868 |
What is the life expectancy with type 1 diabetes in California?
A 10-year-old diagnosed with type 1 diabetes in California in 2025 is expected to live to 70.0, compared with 82.1 for a 10-year-old without T1D: 12.1 years of life lost. Counting years lived with complications as well, T1D costs 22.0 years of healthy life at today's level of care. If everyone received timely diagnosis, insulin and test strips, and insulin pumps and CGMs, that loss would fall to 15.1 years.
| Level of care | Healthy years restored | Healthy years of life | Healthy years still lost |
|---|---|---|---|
| Current level of care | – | 60.0 | 22.0 |
| + Timely diagnosis for everyone | – | 60.0 | 22.1 |
| + Insulin and test strips for everyone | +1.2 | 61.2 | 20.9 |
| + Insulin pumps and CGMs for everyone | +5.8 | 67.0 | 15.1 |
How does California compare?
| 2025 | California | United States | World |
|---|---|---|---|
| People living with T1D per 100,000 | 389.0 | 435.7 | 115.5 |
| New diagnoses per 100,000 | 13.1 | 15.1 | 6.2 |
| Missing people per 100 living with T1D | 20.5 | 25.1 | 43.0 |
| Expected age at death, 10-year-old with T1D | 70.0 | 67.0 | 51.3 |
| Expected age at death, 10-year-old in the general population | 82.1 | 80.1 | 77.0 |
Type 1 diabetes in other US states
- Texas126,321 living with T1D
- Florida101,368 living with T1D
- New York89,299 living with T1D
- Pennsylvania62,513 living with T1D
- Illinois56,889 living with T1D
- Ohio56,289 living with T1D
- North Carolina49,340 living with T1D
- Georgia48,659 living with T1D
More data
All figures are T1D Index version 3.0 estimates for all ages. Missing people are those who would be alive today had they not died early from type 1 diabetes. Expected age at death is for a 10-year-old. See Data & Methods for how the estimates are made and the peer-reviewed publications behind them.