Is the taxi Liao GTM a Jinzhou taxi?

Yes

Liao G is Jinzhou,

The alphabetical order of Liaoning license plate numbers is based on the 1992 prefecture-level administrative division code. We can see the prefecture-level administrative division codes from the first four digits of our ID cards. The general principle of ranking the prefecture-level administrative divisions in the province is that the provincial capital comes first, prefecture-level cities come second, followed by regional administrative offices, and then It is an autonomous prefecture and finally a county-level administrative unit directly under the jurisdiction of a province.