California is struggling to confront its homelessness crisis: After big-city mayors up and down the state lobbied hard for more funding, state leaders agreed to spend an additional $600 million to help fight the problem.

Here are some basic numbers to help understand one of the stateโ€™s most vexing issues.

How many Californians are homeless now, and how has that changed over time?

While itโ€™s tough to say precisely how many Californians are experiencing homelessness, the federal Housing and Urban Development Department estimates the number statewide at 130,000 on a given night. Thatโ€™s 25 percent of the entire nationโ€™s homeless population. Since 2016, California experienced a larger increase in homelessness than any other state.

โ€œOur state has more than 1.7 million low-income households spending more than half their income in housing costs,โ€ said Ben Metcalf, the director of the state Department of Housing and Community Development. โ€œWhen youโ€™re paying that much for housing, with so little left over, even a minor shock can start a cycle of homelessness.โ€

California has the highest percentage of unsheltered homeless individuals in the country, at slightly less than 70 percent. This means that the vast majority of the stateโ€™s homeless population does not utilize temporary living arrangements provided by either charitable organizations or government programs. Rather, they have been found living on the streets, parks or other places not meant for human habitation.

โ€œThe lack of shelters is due to a lack of resources, and we donโ€™t really have a plan to end homelessness,โ€ said Christopher Martin, legislative advocate at Housing California. โ€œWe donโ€™t have strong programs to end homelessness on the state level. We know the shelters are a part of the solution, but at the end of the day, we know that we need exits for the shelters.โ€

Where are Californiaโ€™s homeless?

In 2017, Los Angeles County had the highest population of homeless individuals in all of California at roughly 55,000โ€”and was only second to New York for holding the largest population of homeless people in the nation. And while 95 percent of New Yorkโ€™s homeless population was sheltered, only 25 percent of those in Los Angeles were sheltered.

On the positive side, 2018 marked the first time in four years the homelessness count in Los Angeles actually dropped.

Martin said that this decrease was driven by Los Angelesโ€™ $40 million Flexible Housing Subsidy Pool, which provides rental subsidies to local residents experiencing homelessness.

Who are the stateโ€™s homeless?

The majority of Californiaโ€™s unsheltered homeless population is chronically homeless, meaning that they have been homeless for a year or more or have experienced at least four episodes of homelessness in the past three years. Chronically homeless individuals are often suffering from serious mental or physical illnesses.

California has 12 percent of the nationโ€™s population of homeless families with children. From 2016 to 2017, the state experienced one of the largest increases of homeless families in the nation, leaving 1,000 more families on the streets.

Outside of homeless families, California also reported the largest number of unaccompanied homeless youth, which includes any individual under the age of 25 who does not live with a family member. Overall, 58 percent of the nationโ€™s unsheltered homeless youth resides in California.

The state is also home to 29 percent of the nationโ€™s homeless veterans, and two-thirds of them are unsheltered.

CALmatters.org is a nonprofit, nonpartisan media venture explaining California policies and politics.