More than 33 million people in the state will be affected by the lockdown.
A pandemic of the novel coronavirus has now infected more than 66.4 million people and killed over 1.5 million worldwide, according to real-time data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.
Los Angeles County set a new record number of coronavirus cases Sunday, the Health Department said.
The county saw 10,528 new cases and 23 new deaths, according to the Health Department. There are 2,855 people currently hospitalized, the Health Department said.
Los Angeles leads the country with total number of cases, 439,408, and total fatalities, 7,886, according to Johns Hopkins University's Coronavirus Resource Center.
Multiple states have reported records for new daily cases of the coronavirus on Sunday.
California recorded 30,075 new cases and 85 deaths, according to the state's COVID-19 dashboard. The state goes into a stricter lockdown starting on Sunday night.
North Carolina also broke its record with 6,438 new cases.
Earlier on Sunday, New Jersey reported 6,046 additional cases.
Just one day after California recorded its highest daily case count ever -- 25,000 cases in a single day and nearly 9,000 cases in Los Angeles County alone -- 33 million residents in the state are returning to some of the strictest lockdown procedures since the start of the pandemic.
The restrictions begin at midnight local time.
The lockdown comes as health officials have warned if there is not a significant change in the rise in cases, hospitals in the state could be out of available beds by Christmas.
In hard-hit Imperial County, there are only two ICU beds remaining, according to county data. In Los Angeles County, the number of hospitalized COVID-19 patients has increased 106% in the past three days.
Los Angeles Mayor Eric Garcetti said on Friday, "8860 cases, a number I can hardly believe, that just a few weeks ago would have been unimaginable. We're on the verge of reaching 10,000 cases daily with the numbers that we're seeing this week."
As part of the lockdown, gatherings of people from different households will be prohibited, except for outdoor services and political demonstrations.
All outdoor dining must immediately close, hair and nail salons, playgrounds, zoos, museums, aquariums and wineries must also be closed.
Nonessential travel is banned and stays at campgrounds, overnight or short-term, will not be permitted. Retail can remain open, but only at 20% capacity.
-ABC News' Bonnie Mclean
New Jersey reported an additional 6,046 new cases of COVID-19 on Sunday, the highest new daily case count for the state since the start of the pandemic.
The previous high was recorded on Friday.
An additional 16 deaths occurred in the last 24 hours, according to the state's COVID-19 dashboard.
There are currently 3,241 hospitalized for the coronavirus in the state.
New Jersey now has 368,016 total cases and 15,485 deaths.
"These numbers speak for themselves. Mask up. Social distance. Wash your hands. Avoid gatherings," Gov. Phil Murphy said on Twitter.
