Cal Fire reported 6,877 in California from January 1 to December 10, including the devastating North Bay fires in October.
His death was announced Thursday but no details are being released. No other firefighters were injured. He was the father of a 2-year-old daughter and his wife, Ashley, is expecting their second child in the spring, KSWB reported. "Until this review is complete, there is nothing more I can share".
Firefighting costs so far were tallied at 74.7 million dollars (£55.6 million), according to Cal Fire.
He leaves behind a wife and a two-year-old daughter.
A return of gusty Santa Ana winds brought renewed activity to inland portions of the so-called Thomas Fire straddling coastal Ventura and Santa Barbara counties.
At about 12:45 p.m., County Fire crews were dispatched to Highway 1 near Jalama Road.
Ventura County sheriff's officials said Iverson suffered fatal injuries near the eastern flank of the Thomas Fire between 9 a.m. and 10 a.m. PT Thursday, according to ABC's Los Angeles-affiliate KABC.
Gov. Jerry Brown issued a statement, saying, "Anne and I are saddened by Engineer Cory Iverson's tragic death".
"His bravery and years of committed service to the people of California will never be forgotten, " the governor stated.
The California Department of Forestry and Fire Protection (Cal Fire) said on Wednesday: "Firefighters will remain engaged in structure defence operations and scout for opportunities to establish direct perimeter control".
Authorities say a 70-year-old Santa Paula woman died from smoke inhalation and injuries from a auto crash last week as she apparently tried to evacuate.
Mohave Valley Fire Department Engineer Paramedic Mike McDonald, along with crewmembers Engineer Humburto Rodriguez and firefighters Donald Perkins and Will Irvine are in California working the deadly blaze, helping to hold the line on what is now the fourth largest wildfire in California history.
The blaze - named according to where it started, near the Thomas Aquinas College - is by far the largest of six major fires alight in the state. Containment was at 35 percent early Friday morning.
Officials did not immediately disclose how Iverson died. Mandatory evacuation orders were still in effect for the areas of Sespe Creek to the west, Burson Ranch to the east, the Los Padres Forest boundary to the north and the Fillmore City limits to the south. A voluntary evacuation is also in effect for Goodenough Road. Cal Fire says Santa Barbara, Carpinteria, Summerland, Montecito and surrounding areas continue to be threatened. The massive inferno is encroaching upon the burn areas from the Tea and Jesusita fires, which destroyed hundreds of homes and carved paths of destruction in neighboring hillside areas of Montecito and Santa Barbara in 2008 and 2009 respectively.