Devon and Cornwall Police are seeking any information relating to the whereabouts of Jesse Holloway.
He was last believed to be in the Clovelly area overnight from Saturday 7 September into the morning of the Sunday 8 September.
He is believed to be vulnerable and may not know his way around the area.
Residents in the Woolsery and Torridge areas are being asked to check outbuildings/farm buildings and land for any sign of Jesse.
He is described as a white male, 29 years old, with green eyes, light brown sandy coloured short hair and a short beard and athletic build. He usually wears jeans and t-shirts.
Anyone with information relating to his whereabouts is requested to please call 999, quoting log 281 of 08/09/19.