Oren F. Morton’s 1914 county history identifies Amboy as formerly Painter’s Mills. He describes a hamlet of about six farmhouses with a saw and grist mill, and discusses the road from Amboy toward Rowlesburg along the Lantz and Goff ridges.

The postal papers connect the names directly. An 1871 application and accompanying map use Painters Mill. A questionnaire signed by D. S. Wilt on December 3, 1892 addresses the office as Amboy, “late Painters Mill.” The two names therefore share one postal record collection here, with the original name retained beside each image.

Painters Mill, Painter’s Mill, Painters Mills, and Painter’s Mills are included as search variants. The exact postal name-change date has not yet been established from the reviewed records. The 1871 application date alone does not establish when the office opened.