The ACTH receptor is a type of melanocortin receptor (type 2) which is specific for ACTH.
It is found in the zona fasciculata of the adrenal cortex and stimulates production of cortisol. (By contrast, aldosterone production from the zona glomerulosa is stimulated primarily by angiotensin II.)
Roy et al. 2007 Differential regulation of the human ACTH receptor (MC2R) by human MRAP isoforms alpha and beta in isogenic HEK 293 cells. Mol Endocrinol 21:1656-1669