T1D Numbers

Type 1 diabetes in Washington

T1D Index estimates for 2025 · United States

An estimated 38,370 people are living with type 1 diabetes in Washington in 2025. Each year about 1,225 people are newly diagnosed and 304 people with T1D die. A further 8,031 people would be alive today had they not died early from type 1 diabetes.

People living with T1D

38,370

New diagnoses in 2025

1,225

Deaths in 2025

304

Missing people

8,031

Expected age at death, 10-year-old with T1D

68.7years

How many people have type 1 diabetes in Washington?

38,370 people in Washington are living with type 1 diabetes in 2025, or 460.7 per 100,000 people. That is close to the United States average of 435.7 per 100,000 and higher than the global average of 115.5. Washington has the 13th-largest number of people living with T1D of the 50 states and the District of Columbia.

For every 100 people living with T1D in Washington, 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 Washington?

4,498 people younger than 20 were living with type 1 diabetes in Washington in 2024 (95% CI, 4,371–4,627), out of 37,572 people of all ages. About 23.2 in every 100,000 people younger than 20 were newly diagnosed that year, close to the national rate of 24.0. These 2024 figures and their confidence intervals are published in JAMA Network Open.

Published 2024 type 1 diabetes estimates for Washington with 95% confidence intervals
2024Washington95% CIUnited States
People living with T1D, all ages37,57236,448–38,9231,476,859
People living with T1D, younger than 204,4984,371–4,627196,778
New diagnoses per 100,000 people younger than 2023.220.7–26.024.0
Pediatric endocrinologists per 1,000 people younger than 18 with T1D9.49.1–9.710.1

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 Washington?

The number of people living with T1D in Washington went from 16,521 in 2000 to 38,370 in 2025, and is projected to rise to 49,176 by 2040 (+28%).

020K40K60K200020202040Projected →38.4K49.2K2000: 16,521 people living with T1D2001: 17,094 people living with T1D2002: 17,684 people living with T1D2003: 18,233 people living with T1D2004: 18,835 people living with T1D2005: 19,478 people living with T1D2006: 20,277 people living with T1D2007: 21,080 people living with T1D2008: 21,976 people living with T1D2009: 22,875 people living with T1D2010: 23,693 people living with T1D2011: 24,556 people living with T1D2012: 25,373 people living with T1D2013: 26,215 people living with T1D2014: 27,130 people living with T1D2015: 28,175 people living with T1D2016: 29,344 people living with T1D2017: 30,519 people living with T1D2018: 31,625 people living with T1D2019: 32,710 people living with T1D2020: 33,685 people living with T1D2021: 34,966 people living with T1D2022: 35,709 people living with T1D2023: 36,564 people living with T1D2024: 37,572 people living with T1D2025: 38,370 people living with T1D2026 (projected): 39,179 people living with T1D2027 (projected): 39,973 people living with T1D2028 (projected): 40,754 people living with T1D2029 (projected): 41,503 people living with T1D2030 (projected): 42,275 people living with T1D2031 (projected): 43,016 people living with T1D2032 (projected): 43,748 people living with T1D2033 (projected): 44,460 people living with T1D2034 (projected): 45,182 people living with T1D2035 (projected): 45,905 people living with T1D2036 (projected): 46,554 people living with T1D2037 (projected): 47,231 people living with T1D2038 (projected): 47,905 people living with T1D2039 (projected): 48,545 people living with T1D2040 (projected): 49,176 people living with T1D
People living with type 1 diabetes in Washington, 2000–2040. Solid line: modelled estimates to 2025; dashed line: projection to 2040.
Type 1 diabetes in Washington over time, all ages
YearLiving with T1DNew diagnosesDeathsMissing people
200016,5217372444,991
201023,6939202286,172
202033,6851,1533427,341
202538,3701,2253048,031
2030 (projected)42,2751,3894208,630
2040 (projected)49,1761,40447810,161

What is the life expectancy with type 1 diabetes in Washington?

A 10-year-old diagnosed with type 1 diabetes in Washington in 2025 is expected to live to 68.7, compared with 81.0 for a 10-year-old without T1D: 12.3 years of life lost. Counting years lived with complications as well, T1D costs 21.8 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 15.0 years.

Healthy years of life for a 10-year-old diagnosed with T1D in Washington, as each level of care is added in turn
Level of careHealthy years restoredHealthy years of lifeHealthy years still lost
Current level of care–59.121.8
+ Timely diagnosis for everyone–59.121.9
+ Insulin and test strips for everyone+1.260.320.7
+ Insulin pumps and CGMs for everyone+5.766.015.0

How does Washington compare?

Type 1 diabetes in Washington compared with the United States and the world, 2025
2025WashingtonUnited StatesWorld
People living with T1D per 100,000460.7435.7115.5
New diagnoses per 100,00014.715.16.2
Missing people per 100 living with T1D20.925.143.0
Expected age at death, 10-year-old with T1D68.767.051.3
Expected age at death, 10-year-old in the general population81.080.177.0

Type 1 diabetes in other US states

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More data

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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.