Suicide is the 10th cause of death among adults in the United States, according to the American Foundation for Suicide Prevention. And more than 600,000 people died as a result of suicide between 1999 and 2015, the Centers for Disease Control and Prevention reports. Unfortunately, these numbers are rising.

We looked at research by the CDC to see which states had the highest rates of suicide as of 2015. And we analyzed information from the American Foundation for Suicide Prevention. Here are the 15 states with the highest suicide rates.

15. West Virginia

It’s the second leading cause of death for those between ages 15 and 34. | Joe Raedle/Getty Images It’s the second leading cause of death for those between ages 15 and 34. | Joe Raedle/Getty Images

Suicide death rate (per 100,000 people): 17.4

17.4 Deaths: 340

Suicide is the second leading cause of death among West Virginia’s 15- to 34-year-old age group. It is the 11th leading cause of death for the state overall. In addition, suicide cost West Virginia more than $307 million in total lifetime medical and work loss costs in 2010. This is an average of $1,100,568 per suicide death, according to American Foundation for Suicide Prevention.

Next: A state in the Midwest

14. North Dakota

Suicide costs millions. | Ben Harding/iStock/Getty Images Suicide costs millions. | Ben Harding/iStock/Getty Images

Suicide death rate (per 100,000 people): 17.5

17.5 Deaths: 124

Suicide is the leading cause of death among North Dakota’s 35- to 44-year-old age group. It is the ninth leading cause of death in North Dakota overall. Suicide cost North Dakota more than $140,345,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,324,010 per suicide death, according to American Foundation for Suicide Prevention.

Next: A state in the Pacific Northwest

13. Oregon

Over 700 people in Oregon died from suicide in 2015. | Craig Mitchelldyer/Getty Images Over 700 people in Oregon died from suicide in 2015. | Craig Mitchelldyer/Getty Images

Suicide death rate (per 100,000 people): 17.8

17.8 Deaths: 762

Suicide is the second leading cause of death among Oregon’s 15- to 34-year-old age group. It is the eighth leading cause of death in Oregon overall. Suicide cost Oregon $740,356,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,080,811 per suicide death, according to American Foundation for Suicide Prevention.

Next: The Grand Canyon State

12. Arizona

Costs soared to over a billion dollars. | Dreamframer/iStock/Getty Images Costs soared to over a billion dollars. | Dreamframer/iStock/Getty Images

Suicide death rate (per 100,000 people): 18.2

18.2 Deaths: 1,276

Suicide is the leading cause of death among Arizona’s 10- to 14-year-old age group. It is the eighth leading cause of death in Arizona overall. Suicide cost Arizona $1,246,006,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,139,987 per suicide death, according to American Foundation for Suicide Prevention.

Next: Arizona’s neighbor to the west

11. Nevada

Suicide is the eighth leading cause of death in Nevada. | Z-lex/iStock/Getty Images Suicide is the eighth leading cause of death in Nevada. | Z-lex/iStock/Getty Images

Suicide death rate (per 100,000 people): 18.4

18.4 Deaths: 558

Suicide is the second leading cause of death among Nevada’s 10- to 34-year-old age group. It is the eighth leading cause of death in Nevada overall. Suicide cost Nevada $593,140,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,084,351 per suicide death, according to American Foundation for Suicide Prevention.

Next: A state in the South

10. Arkansas

There’s an average of over a million dollars per death in medical and work loss costs. | RoschetzkyIstockPhoto/iStock/Getty Images There’s an average of over a million dollars per death in medical and work loss costs. | RoschetzkyIstockPhoto/iStock/Getty Images

Suicide death rate (per 100,000 people): 19.1

19.1 Deaths: 577

Suicide is the second leading cause of death among Arkansas’ 25- to 34-year-old age group. It is the 10th leading cause of death in Arkansas overall. Suicide cost Arkansas $540,251,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,208,615 per suicide death, according to American Foundation for Suicide Prevention.

Next: One of the mountain states

9. Colorado

The suicide rate is 19.5 per 100,000 people. | Kevork Djansezian/Getty Images The suicide rate is 19.5 per 100,000 people. | Kevork Djansezian/Getty Images

Suicide death rate (per 100,000 people): 19.5

19.5 Deaths: 1,093

Suicide is the leading cause of death among Colorado’s 10- to 14-year-old age group. It is the seventh leading cause of death in Colorado overall. Suicide cost Colorado $1,053,409,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,217,814 per suicide death, according to American Foundation for Suicide Prevention.

Next: The Sooner State

8. Oklahoma

There were close to 800 deaths in 2015. | Saul Loeb/AFP/Getty Images There were close to 800 deaths in 2015. | Saul Loeb/AFP/Getty Images

Suicide death rate (per 100,000 people): 20.3

20.3 Deaths: 790

Suicide is the second leading cause of death among Oklahoma’s 10- to 34-year-old age group. It is the eighth leading cause of death in Oklahoma overall. Suicide cost Oklahoma $778,731,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,260,082 per suicide death, according to American Foundation for Suicide Prevention.

Next: The Mount Rushmore State

7. South Dakota

It’s the leading cause of death for those ages 10 to 14. | Scott Olson/Getty Images It’s the leading cause of death for those ages 10 to 14. | Scott Olson/Getty Images

Suicide death rate (per 100,000 people): 20.4

20.4 Deaths: 173

Suicide is the leading cause of death among South Dakota’s 10- to 14-year-old age group. It is the ninth leading cause of death in South Dakota overall. Suicide cost South Dakota $181,751,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,298,218 per suicide death, according to American Foundation for Suicide Prevention.

Next: The Gem State

6. Idaho

Suicide costs the state over $300 million per year. | oscity/iStock/Getty Images Suicide costs the state over $300 million per year. | oscity/iStock/Getty Images

Suicide death rate (per 100,000 people): 22.1

22.1 Deaths: 359

Suicide is the second leading cause of death among Idaho’s 10- to 44-year-old age group. It is the eighth leading cause of death in Idaho overall. Suicide cost Idaho $329,244,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,135,325 per suicide death, according to American Foundation for Suicide Prevention.

Next: The Beehive State

5. Utah

Suicide is the seventh leading cause of death. | iStock/Getty Images Suicide is the seventh leading cause of death. | iStock/Getty Images

Suicide death rate (per 100,000 people): 22.4

22.4 Deaths: 630

Suicide is the leading cause of death among Utah’s 10- to 24-year-old age group. It is the seventh leading cause of death for Utah overall. Suicide cost Utah $629,958,000 in total lifetime medical and work loss costs in 2010. This is an average of $1,331,835 per suicide death, according to American Foundation for Suicide Prevention.

Next: Another southwestern state

4. New Mexico

It is the second leading cause of death for those ages 10 to 44. | RoschetzkyIstockPhoto/iStock/Getty Images It is the second leading cause of death for those ages 10 to 44. | RoschetzkyIstockPhoto/iStock/Getty Images

Suicide death rate (per 100,000 people): 23.7

23.7 Deaths: 500

Suicide is the second leading cause of death among New Mexico’s 10- to 44-year-old age group. It is the eighth leading cause of death for New Mexico overall. Suicide cost New Mexico more than $506 million in total lifetime medical and work loss costs in 2010. This is an average of $1,227,332 per suicide death, according to American Foundation for Suicide Prevention.

Next: Big Sky Country

3. Montana

The suicide death rate is just over 25 per 100,000 people. | ChrisBoswell/iStock/Getty Images The suicide death rate is just over 25 per 100,000 people. | ChrisBoswell/iStock/Getty Images

Suicide death rate ( per 100,000 people): 25.3

( 25.3 Deaths: 272

Suicide is the second leading cause of death among Montana’s 10- to 44-year-old age group. It is the eighth leading cause of death for the state overall. Suicide cost Montana more than $253 million in total lifetime medical and work loss costs in 2010. This is an average of $1,116,213 per suicide death, according to American Foundation for Suicide Prevention.

Next: America’s last frontier

2. Alaska

There was a high amount of suicides compared to population. | mbarrettimages/iStock/Getty Images There was a high amount of suicides compared to population. | mbarrettimages/iStock/Getty Images

Suicide death rate (per 100,000 people): 26.9

26.9 Deaths: 201

Suicide is the leading cause of death among Alaska’s 10- to 24-year-old age group. It is the fifth leading cause of death for the state overall. Suicide cost Alaska more than $266 million in total lifetime medical and work loss costs in 2010. This is an average of $1,383,382 per suicide death, according to American Foundation for Suicide Prevention.

Next: The Cowboy State

1. Wyoming

It’s the sixth leading cause of death in the state. | Karen Bleier/AFP/Getty Images It’s the sixth leading cause of death in the state. | Karen Bleier/AFP/Getty Images

Suicide death rate (per 100,000 people): 28

28 Deaths: 157

Suicide is the second leading cause of death among Wyoming’s 15- to 44-year-old age group. It is the sixth leading cause of death for the state overall. Suicide cost Wyoming more than $155 million in total lifetime medical and work loss costs in 2010. This is an average of $1,184,336 per suicide death, according to American Foundation for Suicide Prevention.

How to get help: In the U.S., call the National Suicide Prevention Lifeline at 1-800-273-8255. Or text HOME to 741-741 to connect with a trained crisis counselor at the free Crisis Text Line.

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