Rock Springs is a city in Sweetwater County, Wyoming, United States. The population was 23,526 at the 2020 census, making it the fifth most populous city in the state of Wyoming, and the most populous city in Sweetwater County. Rock Springs is the principal city of the Rock Springs micropolitan statistical area, which has a population of 37,975. Rock Springs is known as the Home of 56 Nationalities because of the influx of immigrants from all over the world who came to work in the coal mines that supplied the fuel to power the steam engines of the Union Pacific Railroad. The city's rich cultural heritage is celebrated each summer on International Day, a festival where the foods, costumes, and traditions of residents' ancestors are recreated and enjoyed at Bunning Park in downtown Rock Springs.

Rock Springs is the site of Western Wyoming Community College and Wyoming's Big Show, a yearly event with a carnival and concerts which is held at the Sweetwater County Events Complex.

Rock Springs is located in an energy-rich region with many oil and natural gas wells.

Rock Springs derives its name from a rock spring which flowed in the Number 6 district in the northern part of town. An erroneous story had indicated that the spring was found by a lost Pony Express rider, but the spring station was known to Jim Bridger before 1860; the Overland Stage station was located nearby. The spring disappeared when the coal mine operations interrupted the underground flow. Later an 'S' was added to the name making it "Rock Springs".

Through the years, water supplies have been a problem to Rock Springs. In the early days, Ed Cleg hauled domestic water from the sulfur spring north of Rock Springs and charged $.25 a barrel. With the mining operations, the water flow was interrupted and water was hauled from Green River and Point of Rocks. Beginning in 1887, a water main was started from the Green River and completed in 1888 to bring a continuous supply of water to Rock Springs.

Rock Springs has a multi-ethnic heritage; locals called it the 57 Variety Town. The first immigrants were brought in by the railroad and coal mining companies. The Welsh and British people were initially most populous. Later, Irish, Blacks and refugees from the Southern part of the United States also came. The Scandinavian people were represented with a heavy Mormon recruitment.

One of the worst incidents of anti-immigrant violence in American history, known as the Rock Springs Massacre, occurred on September 2, 1885, whereby White miners slaughtered their Chinese counterparts due to anti-Chinese sentiment. There are still remains of the old coal mining towns outside of Rock Springs.

On June 10, 1892, Rock Springs National Bank opened on 515 S Main St, across from the Union Pacific depot. The original sandstone building was designed by Mayor H.H. Edgar who chose an Italianate style. In 1907, when John Hay Sr. assumed control of the business, the location moved to C Street. RSNB owned the original building until 1921 when it was sold to Anton Mengoni. Hay Sr. navigated the bank through the Great Depression and World War II, before retiring in 1947. John Hay Jr., his son, then took control of the bank, having to control wild growth during Wyoming's massive energy boom in the 1970s. Another of Hay Sr.'s sons was Archibald (Archie) Hay. Archibald was killed in France by a German plane in 1918. In his memory, Post 24 of the American Legion, chartered in 1919, was named Archie Hay Post.

Rock Springs was featured on 60 Minutes in 1977 due to corruption within the Police Department and City Government. A grand jury was called into session. The Sheriff of Sweetwater County, James Stark, testified and no wrongdoing was ever found. A follow-up was filmed 20 years later for the show City Confidential. The episode was named "Rock Springs: Deadly Draw in the Wild West".

According to the United States Census Bureau, the city has a total area of 19.34 square miles (50.09 km), all land.

Rock Springs has a semi-arid climate (Köppen BSk) with cold, snowy winters and warm summers. Precipitation is usually light but has two peaks in mid spring and in early fall. Summer and winter are both drier.

The average December temperatures are a maximum of 33.2 °F (0.7 °C) and a minimum of 12.4 °F (−10.9 °C). The average July temperatures are a maximum of 86.3 °F (30.2 °C) and a minimum of 52.5 °F (11.4 °C). There an average of 14.7 days annually with highs of 90 °F (32.2 °C) or higher. There are an average of 183.6 nights with lows of 32 °F (0 °C) or lower and 11.5 nights with lows of 0 °F (−17.8 °C) or lower. The record high temperature was 98 °F (36.7 °C) on July 13, 2002, and the record low temperature was −37 °F (−38.3 °C) on January 12, 1963.

The average annual precipitation is 10.45 inches (265.4 mm). There is an average of 61.7 days with measurable precipitation. The wettest calendar year was 1965 with 14.54 in (369.3 mm) and the driest 2012 with 3.14 in (79.8 mm). The most precipitation in one month was 3.67 in (93.2 mm) in September 1965, July 1973, and May 1995. The most snowfall in one year was 79.7 in (2.02 m) in 1995. The most snowfall in one month was 23.7 in (0.60 m) in February 2001.

Historical population

Census	Pop.	Note	%±
1870	40		—
1880	763		1,807.5%
1890	3,406		346.4%
1900	4,363		28.1%
1910	5,778		32.4%
1920	6,456		11.7%
1930	8,440		30.7%
1940	9,827		16.4%
1950	10,857		10.5%
1960	10,371		−4.5%
1970	11,657		12.4%
1980	19,458		66.9%
1990	19,050		−2.1%
2000	18,708		−1.8%
2010	23,036		23.1%
2020	23,526		2.1%

At the 2010 census, there were 23,036 people, 8,762 households and 5,849 families living in the city. The population density was 1,191.1 inhabitants per square mile (459.9/km). There were 10,070 housing units at an average density of 520.7 per square mile (201.0/km). The racial makeup of the city was 86.4% White, 1.4% African American, 0.8% Native American, 1.1% Asian, 0.1% Pacific Islander, 7.5% from other races, and 2.6% from two or more races. Hispanic or Latino of any race were 16.4% of the population.

There were 8,762 households, of which 35.8% had children under the age of 18 living with them, 49.9% were married couples living together, 9.8% had a female householder with no husband present, 7.1% had a male householder with no wife present, and 33.2% were non-families. 25.3% of all households were made up of individuals, and 6.6% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 3.07.

The median age in the city was 31.5 years. 26.4% of residents were under the age of 18; 11.4% were between the ages of 18 and 24; 29.4% were from 25 to 44; 24.6% were from 45 to 64; and 8.1% were 65 years of age or older. The gender makeup of the city was 52.1% male and 47.9% female.

At the 2000 census, there were 18,708 people, 7,348 households and 4,930 families living in the city. The population density was 1,014.4 per square mile (391.7/km). There were 8,359 housing units at an average density of 453.3 per square mile (175.0/km). The racial makeup of the city was 91.75% White, 1.07% African American, 0.86% Native American, 1.02% Asian, 0.03% Pacific Islander, 3.05% from other races, and 2.22% from two or more races. Hispanic or Latino of any race were 8.96% of the population.

There were 7,348 households, of which 35.4% had children under the age of 18 living with them, 52.5% were married couples living together, 10.2% had a female householder with no husband present, and 32.9% were non-families. 27.4% of all households were made up of individuals, and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.02.

27.1% of the population were under the age of 18, 11.2% from 18 to 24, 29.2% from 25 to 44, 22.5% from 45 to 64, and 9.9% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 99.2 males. For every 100 females age 18 and over, there were 98.2 males.

The median household income was $42,584 and the median family income was $51,541. Males had a median income of $44,809 compared with $22,609 for females. The per capita income for the city was $19,396. About 6.4% of families and 9.4% of the population were below the poverty line, including 11.0% of those under age 18 and 8.7% of those age 65 or over.

Rock Springs hosts the International Festival, the Blues and Brews Festival, the Wyoming Chocolate Festival and the Rod and Rails Festival. In July, August, and September, the city holds a county fair called Wyoming's Big Show.

Rock Springs has two public libraries, Rock Springs Library and White Mountain Library, both of which are branches of the Sweetwater County Library System. The Rock Springs Library is also an original Carnegie Library, and has since been expanded to include an art gallery that is home to an original Norman Rockwell painting.

Public education in the city of Rock Springs is provided by Sweetwater County School District #1. Schools serving the city include: Desert View Elementary, Northpark Elementary, Overland Elementary, Pilot Butte Elementary, Sage Elementary, Stagecoach Elementary, Walnut Elementary, Westridge Elementary, Eastside Elementary, Rock Springs Junior High School, and Rock Springs High School. There are also two alternative campuses – Black Butte High School, and Roosevelt Learning Center.

Western Wyoming Community College is a community college in Rock Springs.

Rock Springs is served by two hyperlocal news websites, SweetwaterNOW.com and Wyo4news.com

Rock Springs is served by two print publications: Rock Springs Daily Rocket-Miner and the Green River Star (a weekly newspaper published in Green River).

Rock Springs is served by a number of radio stations including KRKK, KSIT, KQSW, KMRZ-FM, KYCS, KZWB, KFRZ and KUGR.

All television stations in Rock Springs are translators or satellites of stations located elsewhere:

Channel	Callsign	Network	Notes
13	KGWR-TV	CBS/ABC	Satellite of KGWC-TV, Casper, Wyoming
28	K28JU-D	PBS	relay of Wyoming PBS

• I-80
• US 30 (Dewar Drive)
• US 191
• WYO 370 (Baxter Road/Airport Road)
• WYO 376 (Circumferential Highway/Rock Springs Beltway)
• WYO 430 (Hampshire Street Parkway)

Rock Springs is served by Southwest Wyoming Regional Airport.

Union Pacific serves Rock Springs.

STAR Transit provides local bus service in Rock Springs, with limited service to Reliance and Green River.

Rock Springs' sister city is:

• Skofja Loka, Slovenia

• Adam Archuleta, safety for St. Louis Rams and Chicago Bears
• Earl W. Bascom (1906–1995), rodeo champion, cowboy artist, Rodeo Hall of Fame cowboy, Hollywood actor, inventor lived with his brother in Rock Springs
• Texas Rose Bascom (1922–1993), rodeo performer, trick roper, Hollywood actress, National Cowgirl Hall of Fame inductee
• Paul Brothers, football player
• Ed Cantrell, accused of shooting undercover officer from Rock Springs Police Department
• Butch Cassidy, worked in Rock Springs in a butcher shop before becoming an infamous outlaw
• Bruce Collins (basketball), was drafted by the Portland Trail Blazers in the 1980 NBA Draft and played pro Basketball overseas
• Edward Crippa, U.S. Senator from Wyoming
• Mickey Daniels, actor who appeared in many movies in 1930s
• Boyd Dowler, wide receiver for Green Bay Packers (1959–1969) and Washington Redskins (1971)
• John Frullo, member of Texas House of Representatives from Lubbock, was reared in Rock Springs prior to 1980. His father is the architect John L. Frullo
• Paul Gosar, member of U.S. House of Representatives representing Arizona's 9th congressional district
• Pete Gosar, brother of Paul Gosar and Democratic politician
• Robert Holding, launched first of Grand America Hotels & Resorts west of Rock Springs in 1952
• Joe Legerski, head coach of Wyoming Cowgirls basketball team
• Andrew Manatos, administrative assistant for US Senate Liaison to Presidents John F. Kennedy and Lyndon B. Johnson; responsible for passing historic Civil Rights Bills and other major legislation through Senate
• Florabel Muir, syndicated columnist, New York newspaper reporter and Hollywood screenwriter
• Teno Roncalio, Democratic politician, U.S. Representative 1965–1967 and again 1971–1978
• Jack Snow, wide receiver for Los Angeles Rams (1965–1975)
• J.J. Syvrud, football player
• John Wendling, football player for Buffalo Bills and Detroit Lions
• Spencer West (born 1981), American motivational speaker and disability advocate
• Todd Parr, author, illustrator, animator and television producer
• Kenilynn S. Zanetti, politician

• Official website
• Rock Springs Chamber of Commerce