Green’s Dictionary of Slang

1. a countryman.

1903

H. Hapgood Autobiog. of a Thief 82: The passengers all got ‘next,’ and began to grim. ‘Get on to the Hiker,’ (countryman) said Patsy to Joe, and they both laughed.

2. a small-town marshal.

1931		Irwin Amer. Tramp and Und. Sl. 99: Hiker. A town marshal, one who walks over his territory.
1949		Monteleone Criminal Sl. (rev. edn).