Jamie Lee Harvey was last seen around 3.30pm on Tuesday 14 March at Ayr train station.
She took a train to Glasgow, and officers believe she may have got off the train in Irvine as she is known to frequent the Irvine, Kilwinning, and Saltcoats areas.
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Police in Ayrshire are also liaising with officers in Glasgow City Center and British Transport Police as they are known to travel to the Union Street area.
Jamie Lee has been reported missing before but police say they are “very concerned” because she hasn’t left for so long.
Inspector Alex Bigree, of Irvine Police Station, said: “Although Jamie Lee has been reported missing before, it wasn’t far from this period.
“She is only 12 years old and no one has seen her since Tuesday,” she said.
“We are very concerned. Searches and inquiries are underway to track her down as quickly as possible to ensure she is safe and well.
“If you have seen Jamie Lee since Tuesday morning or if you have any information regarding her whereabouts, we urge you to contact us as soon as possible through 101 quoting Incident #2277 dated March 14.”
Jamie-Lee is described as being about 5 feet tall, of medium build, with long, light brown hair.
She is last seen wearing a black outfit including a padded jacket, jumper, leggings, and sneakers.
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