This timeline is a chronology of significant events in the history of the U.S. State of Wyoming and the historical area now occupied by the state. __NOTOC__

2020s YearDateEvent2022November 8In the 2022 General Election, Wyoming voters elect Harriet Hageman as U.S. Representative and re-elect Mark Gordon as Governor. Republicans retain control of the Wyoming Legislature.2021September 2Wyoming U.S. Representative Liz Cheney is named Vice Chair of the United States House Select Committee on the January 6 Attack.May 12Wyoming U.S. Representative Liz Cheney is removed as Chair of the House Republican Conference.January 13Wyoming U.S. Representative Liz Cheney votes to impeach President Donald Trump.2020November 3In the 2020 General Election, Wyoming voters elect three U.S. Presidential Electors for President Donald Trump, elect Cynthia Lummis as the junior U.S. Senator, and re-elect Liz Cheney as U.S. Representative. Republicans retain control of the Wyoming Legislature.September 17The Mullen Fire ignites west of Centennial. As many as 1,254 firefighters battle the wildfire as it spreads through Carbon County, Albany County, and Jackson County, Colorado, and consumes of forest.April 1The 2020 United States census enumerates the population of the State of Wyoming, later determined to be 576,851, a 2.35% increase since the 2010 United States census. Wyoming remains the least populous of the 50 United States.

2010s YearDateEvent2019January 7Mark Gordon takes office as the thirty-third Governor of State of Wyoming.January 3Liz Cheney takes office as the Wyoming U.S. Representative and is named Chair of the House Republican Conference.2017August 21The solar eclipse of August 21, 2017 sweeps across Wyoming. Huge crowds gather in Casper and Glendo to witness the total solar eclipse.2011January 3Matt Mead takes office as the thirty-second Governor of State of Wyoming.2010April 1The 2010 United States census enumerates the population of the State of Wyoming, later determined to be 563,626, an increase of 14.1% since the 2000 United States census. Wyoming remains the least populous of the 50 U.S. states.

2000s YearDateEvent2007January 3John Barrasso takes office as the junior Wyoming U.S. Senator.2003January 6Dave Freudenthal takes office as the thirty-first Governor of State of Wyoming.2001January 20Dick Cheney takes office as the forty-sixth Vice President of the United States.2000April 1The 2000 United States census enumerates the population of the State of Wyoming, later determined to be 493,782, an increase of 8.9% since the 1990 United States census. Wyoming remains the least populous of the 50 U.S. states.

1990s YearDateEvent1997January 3Mike Enzi takes office as the junior Wyoming U.S. Senator.1995January 2Jim Geringer takes office as the thirtieth Governor of State of Wyoming.1992August 3U.S. President George H. W. Bush signs into law an amendment to the National Trails System Act to designate the California National Historic Trail and Pony Express National Historic Trail as components of the National Trails System.1990April 1The 1990 United States census enumerates the population of the State of Wyoming, later determined to be 453,588, a decrease of -3.4% since the 1980 United States census. As its population decreases, Wyoming becomes the least populous of the 50 U.S. states.

1980s YearDateEvent1989March 22U.S. President George H. W. Bush appoints Dick Cheney the seventeenth United States Secretary of Defense.1988November 8The Town of Alpine is incorporated.June 14The first of over 200 wildfires begin burning in Yellowstone National Park and adjacent national forests. More than 9,000 firefighters battle the wildfires as they consume of forest.1987January 5Mike Sullivan takes office as the twenty-ninth Governor of State of Wyoming.1984November 27The Town of Wright is incorporated.March 8The Town of Rolling Hills is incorporated.1982November 8The Town of Bar Nunn is incorporated.1980April 1The 1980 United States census enumerates the population of the State of Wyoming, later determined to be 469,557, an increase of 41.3% since the 1970 United States census. Wyoming remains the 49th most populous of the 50 U.S. states.

1970s YearDateEvent1979December 18The Town of Hanna annexes the adjacent Town of Elmo.July 16An F3 tornado makes landfall in Cheyenne, killing 1 and injuring 40. It remains the most destructive tornado in the state's history.1978November 10U.S. President Jimmy Carter signs the National Parks and Recreation Act of 1978 authorizing the Continental Divide National Scenic Trail, the Mormon Pioneer National Historic Trail, and the Oregon National Historic Trail.October 9The United Nations Educational, Scientific and Cultural Organization (UNESCO) designates Yellowstone National Park as one of the first 12 World Heritage Sites.1977September The City of Cody transfers Shoshone Cavern to the Bureau of Land Management.1976July 4The State of Wyoming celebrates the Bicentennial of the United States of America.1975January 6Edgar J. Herschler takes office as the twenty-eighth Governor of State of Wyoming.1973April 26The Town of Midwest is incorporated.February 13The Town of La Barge is incorporated.1972October 23U.S. President Richard Nixon issues a proclamation creating Fossil Butte National Monument.1970April 1The 1970 United States census enumerates the population of the State of Wyoming, later determined to be 332,416, an increase of 0.7% since the 1960 United States census. Wyoming becomes the 49th most populous of the 50 U.S. states.

1960s YearDateEvent1968December 2U.S. President Lyndon B. Johnson signs An Act to establish a national trails system, and for other purposes, creating the National Trails System.1967January 2Stanley K. Hathaway takes office as the twenty-seventh Governor of State of Wyoming.1966October 15U.S. President Lyndon B. Johnson signs An Act to provide for the establishment of the Bighorn Canyon National Recreation Area, and for other purposes.1963January 7Clifford P. Hansen takes office as the twenty-sixth Governor of State of Wyoming.1961January 2Jack R. Gage takes office as the twenty-fifth Governor of State of Wyoming.1960April 29U.S. President Dwight D. Eisenhower signs An Act to revise the boundaries and change the name of the Fort Laramie National Monument, Wyoming, and for other purposes, expanding Fort Laramie National Monument and changing the name to Fort Laramie National Historic Site.April 1The 1960 United States census enumerates the population of the State of Wyoming, later determined to be 330,066, an increase of 13.6% since the 1950 United States census. Wyoming becomes the 48th most populous of the 50 U.S. states.

1950s YearDateEvent1959January 3John J. Hickey takes office as the twenty-fourth Governor of State of Wyoming.1957spring Buffalo Bill State Park, Wyoming's first state park, opens.1955January 3Milward Simpson takes office as the twenty-third Governor of State of Wyoming.1954June 29The Town of Frannie is incorporated.June 17U.S. President Dwight D. Eisenhower signs An Act to authorize the abolishment of the Shoshone Cavern National Monument and the transfer of the land therein to the city of Cody, Wyoming, for public recreational use, and for other purposes.1953January 3Clifford J. Rogers takes office as the twenty-second Governor of State of Wyoming.1951May 1The Town of Hulett is incorporated.January 1Frank A. Barrett takes office as the twenty-first Governor of State of Wyoming.1950September 14U.S. President Harry Truman signs An Act to establish a new Grand Teton National Park in the State of Wyoming, and for other purposes, merging Jackson Hole National Monument into Grand Teton National Park.April 1The 1950 United States census enumerates the population of the State of Wyoming, later determined to be 290,529, an increase of 15.9% since the 1940 United States census. Wyoming remains the 47th most populous of the 48 U.S. states.

1940s YearDateEvent1949January 3Arthur G. Crane takes office as the twentieth Governor of State of Wyoming.1945September 2World War II ends as the Empire of Japan formally surrenders.May 8The war in Europe ends as the Greater German Empire formally surrenders.1944December 29U.S. President Franklin D. Roosevelt vetoes House Resolution 2241, "To abolish the Jackson Hole National Monument as created by Presidential Proclamation Numbered 2578, dated March 15, 1943."1943March 15U.S. President Franklin D. Roosevelt issues Executive Proclamation Number 2578, creating Jackson Hole National Monument.January 4Lester C. Hunt takes office as the nineteenth Governor of State of Wyoming.1942November 3The Town of Parco changes its name to the Town of Sinclair at the General Election of 1942.1941December 11The United States declares war on the German Reich and the Italian Empire.December 8The United States declares war on the Empire of Japan and enters World War II.March 10U.S. President Franklin D. Roosevelt issues an executive order renaming Wyoming National Forest as the re-established Bridger National Forest.1940April 1The 1940 United States census enumerates the population of the State of Wyoming, later determined to be 250,742, an increase of 11.2% since the 1930 United States census. Wyoming remains the 47th most populous of the 48 U.S. states.

1930s YearDateEvent1939January 2Nels H. Smith takes office as the eighteenth Governor of State of Wyoming.1938July 16U.S. President Franklin D. Roosevelt issues a proclamation creating Fort Laramie National Monument.April 18The Town of La Grange is incorporated.1937July 22U.S. President Franklin D. Roosevelt signs An Act to create the Farmers' Home Corporation, to promote more secure occupancy of farms and farm homes, to correct the economic instability resulting from some present forms of farm tenancy, and for other purposes, also known as the Bankhead-Jones Farm Tenant Act.1935August 6The Town of Hanna is incorporated.1933May 3U.S. President Franklin D. Roosevelt appoints Nellie Tayloe Ross as the 28th Director of the United States Mint, the first woman to hold the post. She will hold the office for twenty years.January 2Leslie A. Miller takes office as the seventeenth Governor of State of Wyoming.1932January 1The Town of Ten Sleep is incorporated.1931November 16The Town of Green River passes the Green River ordinance that prohibits door-to-door selling. Other towns across the country will adopt the ordinance.February 18Alonzo M. Clark takes office as the sixteenth Governor of State of Wyoming.1930September 13The Town of Albin is incorporated.April 1The 1930 United States census enumerates the population of the State of Wyoming, later determined to be 225,565, an increase of 16.0% since the 1920 United States census. Wyoming remains the 47th most populous of the 48 U.S. states.

1920s