C.R.S. § 19-5-102: Venue.

(1) A petition for relinquishment of the parent-child relationship shall be filed in the county where the child resides or in the county where the petitioner resides. If a child placement agency is involved, the petition may be filed in the county where the child placement agency is located.

(2) A petition for termination of the parent-child legal relationship pursuant to section 19-5-105.5 or section 19-5-105.7 must be filed in the county where the child resides or in the county where the petitioner resides.