Safety fears mean paramedics are unable to attend emergencies at hundreds of north and north-east homes without police protection.
New figures show that 169 addresses have been “red flagged” by the service in Aberdeen and Aberdeenshire, as well as 74 in the IV postcode in the Highlands, seven in Caithness and Orkney, seven in the Western Isles and three in Shetland.
A further 41 of the homes are within the PH postcode, which includes Lochaber, Badenoch and Strathspey, as well as Perth, while there are 132 in the PA area used by Oban and many islands, as well as Paisley and Inverclyde.
Across Scotland, a total of 2,557 addresses can not be attended by ambulance crews in without the support of a police officer because they are potentially dangerous.
The ambulance service revealed the figures following a freedom of information request by the Scottish Conservatives.
Tory public health spokeswoman Annie Wells said: “It’s well-documented just how vital a role lifesaving ambulance workers play in Scotland so it’s quite shocking to see there are more than 2,500 addresses where they can’t safely go about their work.
“No paramedic should ever fear for their own wellbeing, especially when they are dedicating their lives to helping others.
“We clearly need to do more to keep them safe, which means tough action from the courts when those assaulting, or threatening to assault, ambulance workers are caught.”
Under legislation to protect emergency workers, anyone convicted can face up to a year behind bars, a £10,000 fine, or both.
The Scottish Government revealed earlier this year that 6,509 common assaults were recorded on police, fire and ambulance workers across Scotland in 2016/17 – equivalent to more than 17 a day.
A Scottish Ambulance Service spokesperson said: “Getting to the sickest patients will always be our priority, regardless of whether the police are in attendance – our staff are trained in assessing risk and managing aggression so that they can make a sensible decision based on the circumstances.
“Our staff should not fear for their safety when working, which is why we have introduced a range of measures to help protect them.
“Individual addresses where staff have previously faced violence or threatening behaviour are automatically flagged to our crews, who can then request additional support, only if required.
“We keep these individual addresses under review to ensure our system is up-to-date.”
The Glasgow area had 820 red-flagged homes, while there were 469 in Edinburgh and the Lothians, 216 in Lanarkshire, 191 in Ayrshire and 150 in Fife.