Devon's marketing function is responsible for the sale of its oil, gas and natural gas liquids (ethane, propane, butane and natural gasoline), as well as other related activities such as transportation, storage, processing and treating of hydrocarbons. Employees at the company's headquarters in Oklahoma City perform these marketing functions for Devon's domestic production, while employees in Calgary, Alberta, manage the marketing efforts for Devon's Canadian production.

The company's midstream function is responsible for the construction and operation of pipelines, storage and treating facilities and compression and gas processing plants.