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Casper is the only city in and the county seat of Natrona County, Wyoming, United States. With a population of 49,644, Casper is the second largest city in Wyoming, according to the 2000 census. Casper is nicknamed "The Oil City" and has a long history of oil boomtown and cowboy culture, dating back to development of the nearby Teapot Dome. During the early 1980s, Casper was the largest city in Wyoming; according to U.S. Census figures for 1980, Casper had a population of 51,016 compared with Cheyenne's 47,283.

Casper is located in east-central Wyoming at the foot of Casper Mountain, the north end of the Laramie Mountain Range, along the North Platte River. Interstate 25 approaches Casper from the North and East and is the main avenue of transportation to and from the city. The towns immediately adjacent to Casper are Mills, Evansville, Bar Nunn, and Mountain View. Unincorporated areas include Allendale, Dempsey Acres, Red Buttes, Indian Springs, and several others.

Demographics

Historical populations
Census	Pop.		%±
1880	40		—
1890	544		1,260.0%
1900	883		62.3%
1910	2,639		198.9%
1920	11,447		333.8%
1930	16,619		45.2%
1940	17,964		8.1%
1950	23,673		31.8%
1960	38,930		64.4%
1970	39,361		1.1%
1980	51,016		29.6%
1990	46,742		−8.4%
2000	49,644		6.2%
Est. 2007	53,003		6.8%
source:

As of the census of 2000, there were 49,644 people, 20,343 households, and 13,141 families residing in the city. The population density was 2,073.2 people per square mile (800.3/km²). There were 21,872 housing units at an average density of 913.4/sq mi (352.6/km²). The racial makeup of the city was 94.03% White, 0.86% Black, 1.00% Native American, 0.49% Asian, 0.02% Pacific Islander, 2.04% from other races, and 1.56% from two or more races. 5.35% of the population were Hispanic or Latino of any race.

There were 20,343 households out of which 31.8% had children under the age of 18 living with them, 49.6% were married couples living together, 11.1% had a female householder with no husband present, and 35.4% were non-families. 29.1% of all households were made up of individuals and 10.2% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.94.

In the city the population was spread out with 25.9% under the age of 18, 10.5% from 18 to 24, 27.7% from 25 to 44, 22.3% from 45 to 64, and 13.6% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 95.0 males. For every 100 females age 18 and over, there were 91.6 males.

The median income for a household in the city was $36,567, and the median income for a family was $46,267. Males had a median income of $34,905 versus $21,810 for females. The per capita income for the city was $19,409. About 8.5% of families and 11.4% of the population were below the poverty line, including 15.4% of those under age 18 and 7.3% of those age 65 or over.

Transportation

Highways

Interstate Highways:

I-25

• North-South Interstate running from New Mexico to Wyoming.

US Routes:

US 20

• East-West route through Casper that runs concurrent with I-25 through Casper. At exit 189 the highway continues west out of Casper, and no longer runs concurrent with the interstate.
• The Business Route of US 20 follows N. Beverly St. and Yellowstone Hwy. going East-West from I-25/US 87 (Exit 186) to U.S. 20-26 west of Casper in Mills.

US 26

• East-West route through Casper that runs concurrent with I-25 through Casper. At exit 189 the highway continues west out of Casper, and no longer runs concurrent with the interstate.
• The Business Route of US 26 follows N. McKinley St. and Yellowstone Hwy. going East-West from I-25/US 87 (Exit 187) to U.S. 20-26 west of Casper in Mills.

US 87

• North-South through Casper that runs concurrent with I-25 through Casper.

Wyoming State Highways:

WYO 220 (N. Poplar St., CY Avenue)

• East-West route from I-25/US 87 (Exit 188B) west out of Casper towards Alcova.

WYO 251 (Wolcott St., Casper Mountain Rd.)

• North-South route that continues south out of Casper and up Casper Mountain, eventually ending at WYO 487.

WYO 252 (S. Poplar St.)

• North-South route from the intersection of Poplar Street and CY avenue to Casper Mountain Road.

WYO 254 (Salt Creek Hwy.)

• North-South route from I-25/US 87 south to US 20-26 (Yellowstone Hwy.) in Mills.

WYO 255 (Center St., 9th St., CY Avenue)

• North-South route from I-25 exit 188A to the intersection of S. Poplar and CY Avenue, where CY Avenue continues as WY 220.

WYO 258 (Wyoming Blvd.)

• East-West loop route from I-25/US 87 to US 20-26 west of Casper in Mills; the majority of the highway runs along the southern borders of Casper.

Airports

The city has scheduled air service at Casper/Natrona County International Airport, a former army air base built during World War II. The current airport, having been built for World War Two bombers, has large runways and replaced a prior regional airport north of Casper which later became Bar Nunn.