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District of Wyoming

District of Wyoming

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About the U.S. Attorney

Mark A. Klaassen, USA

Mark A. Klaassen was sworn in as the United States Attorney for the District of Wyoming on November 21, 2017. Mr. Klaassen was nominated by President Donald Trump on July 27, 2017 and confirmed by the Senate on November 9, 2017.

About the District

The District of Wyoming encompasses a large and diverse geographical area of more than 97,000 square miles and a relatively small population of 563,626, according to the 2010 census. The two largest cities served by the District are its capital, Cheyenne, with a population of 59,466, and Casper, with a population of 55,316. The District includes the entire state of Wyoming and those parts of Idaho and Montana contained within Yellowstone National Park.


Cheyenne Headquarters Office
P. O. Box 668
Cheyenne, WY 82003-0668
Phone: 307-772-2124
Fax: 307-772-2123

Casper Branch Office
P.O. Box 22211
Casper, WY 82602-5010
Phone: 307-261-5434
Fax: 307-261-5471


Lander Branch Office
P.O. Box 449
Lander, WY 82520-0449
Phone: 307-332-8195
Fax: 307-332-7104

Yellowstone National Park Branch Office
P.O. Box 703
Yellowstone National Park, WY 82190
Phone: 307-690-7394
Fax: 307-344-9266


Recent News

December 14, 2017
Press Release
December 7, 2017
Press Release
November 30, 2017
Press Release
November 21, 2017
Press Release
November 16, 2017
Press Release
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Attorney Vacancies & Volunteer Legal Internships

Hiring Organization Job Title State Posted/Updatedsort ascending
USAO District of Wyoming Law Student Volunteer, Summer Wyoming September 20, 2017
USAO District of Wyoming Law Student Volunteer, Academic Year Wyoming September 14, 2017
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