California has seen a record number of calls to an 800 number over the last few weeks.
"During this holiday period we've been averaging a record of more than 2 million call attempts a day, and it took more than 20 times before people could get through to our UI call centers," said Employment Development Department spokeswoman Patti Roberts.
That's about twice the one-day record of call attempts set in 2004 during an earlier recession, she said.
Callers to Michigan's main phone line handling applications for jobless benefits got an "all circuits are busy now" message Tuesday afternoon. Officials in Michigan, which had the nation's highest jobless rate at 9.6 percent in November, recently began urging applicants to seek benefits through a state Internet site instead. Michigan counted about 473,000 people as unemployed in November, up from about 370,000 a year ago.
Unemployment agencies from Kentucky to Alaska also are reporting long hold times for callers and slowdowns for those filing online because of higher volume.
Several states have added staff to their call centers to handle the surge, including Ohio, Oklahoma and Washington.
Pennsylvania has hired temporary workers and expanded the hours of its unemployment benefits hot line to accommodate a surge in the number of calls, going from 600 employees to more than 800. Officials hope to eventually have 1,100 workers answering calls.
New Mexico has extended call-center hours, upgraded the phone system and added 15 workers. Even so, "We still are receiving reports of people's inability to get through," said Carrie Moritomo, a spokeswoman for the state Department of Workforce Solutions.
In Kentucky, where claims rose to 40,400 in November from 23,400 a year earlier, a flood of new filers overwhelmed the state's unemployment Web site and phone lines on Monday, when more than 8,000 people filed initial claims, said Kim Brannock, a spokeswoman for the Kentucky Education Cabinet, which oversees the state unemployment office.