Petroleum and natural gas are the most important mineral resources of Wyoming. Because of their value to the economy of the State, detailed information concerning their occurrence, development and properties particularly useful to State and Federal agencies. A comprehensive report on the oil and gas fields in the State is likewise valuable to oil companies searching for new deposits of oil and gas. Thousands of small investors and land owners also have a "stake" in Wyoming's petroleum industry. This study contains individual reports on 271 oil and gas fields in Wyoming. The location of each field is given; and where available, maps of the fields, are included in the report. Brief comments are made on the geology of the fields, surface formations and elevations. History of the discovery and development of each field is recorded and the amounts of oil and gas produced in each are tabulated by years. The facilities by which the oil and gas are transported from the fields are mentioned.