Police are urging motorists to remember to keep all valuables out of sight and lock up their cars after a recent spate of thefts and break-ins in the city.
In one of the most recent cases, a number of cars in Thirsk Street were targeted by criminals, possibly overnight on Thursday July 23, into Friday, July 24.
Police said they have also received similar reports from residents in areas around Webb Street, Bargate, Monson Street, Colgrave Street, and Manby Street.
They say vehicles may have been left insecure and/or offenders have forced entry to steal valuable items.
A bag or piece of property such as electrical equipment, even if it is not of any real financial worth, is enough of a temptation for a criminal to smash into a car and steal it just to see if it could be sold on, police said.
Lincolnshire Police also appealed for help in finding out where the stolen property is going.
If you have been offered any items such as sat nav systems, bags, phones, or wallets that seem used and could most likely have been stolen, police would like to hear from you.
If you have any information relating to the incidents please call Lincolnshire Police on 101 quoting incident 76 of 24/07/2015 and related, or contact Crimestoppers anonymously on 0800 555 111.