The Montecito Association recently emailed residents, including Harry and Meghan, to warn police had installed license plate-scanning cameras "in response to the high-value property crime we've experienced recently".
According to The Sun newspaper, the email continued: "The crimes are being committed by sophisticated out-of-the-area theft gangs."
And Craig Bonner, the undersheriff for Santa Barbara County, addressed locals in an online meeting and warned authorities had been having "some problems with professional burglars".
He added: "We want these cameras up and running as quickly as possible to capture these folks as they come and go from the area."
Harry and Meghan had their own security scare in May when police were alerted to two intruders at their house in less than two weeks.
According to police records, a trespasser was reported to be at the property on May 19 - the pair's wedding anniversary - at 5.44pm, and 12 days later, at 3.21pm on May 31, another was reported.
Prince Harry and Meghan Markle flew back to California following an extended mourning period for the death of Queen Elizabeth II in the UK.
All eyes were on the pair during their recent time in England, where they reunited with Harry's older brother, Prince William, and William's wife, Kate Middleton.
