Combined statistical area

A combined statistical area (CSA) is composed of adjacent metropolitan (MSA) and micropolitan statistical areas (µSA) in the United States and Puerto Rico that can demonstrate economic or social linkage. The OMB defines a CSA as consisting of various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. These areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area.

The primary distinguishing factor between a CSA and an MSA is that the social and economic ties between the individual MSAs within a CSA are at lower levels than between the counties within an MSA. CSAs represent multiple metropolitan or micropolitan areas that have an employment interchange of 25. CSAs often represent regions with overlapping labor and media markets.

As of July 2012, there are 169 combined statistical areas in the United States, plus three in Puerto Rico.

San Francisco

San Francisco (/sæn frənˈsɪskoʊ/), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California and the only consolidated city-county in California. San Francisco encompasses a land area of about 46.9 square miles (121 km²) on the northern end of the San Francisco Peninsula, which makes it the smallest county in the state. It has a density of about 18,187 people per square mile (7,022 people per km²), making it the most densely settled large city (population greater than 200,000) in the state of California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego and San Jose, and the 13th-most populous city in the United States—with a Census-estimated 2014 population of 852,469. The city and its surrounding areas are known as the San Francisco Bay Area, and are a part of the larger OMB designated San Jose-San Francisco-Oakland combined statistical area, the fifth most populous in the nation with an estimated population of 8.6 million.

United States

Coordinates: 40°N 100°W / 40°N 100°W / 40; -100

The United States of America (USA), commonly referred to as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major territories and various possessions. The 48 contiguous states and Washington, D.C., are in central North America between Canada and Mexico. The state of Alaska is in the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The territories are scattered about the Pacific Ocean and the Caribbean Sea. At 3.8 million square miles (9.842 million km²) and with over 320 million people, the country is the world's third or fourth-largest by total area and the third most populous. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The geography and climate of the United States are also extremely diverse, and the country is home to a wide variety of wildlife.

Little Rock, Arkansas

Little Rock is the capital and the most populous city of the U.S. state of Arkansas. It is also the county seat of Pulaski County. It was incorporated on November 7, 1831 on the south bank of the Arkansas River very near the geographic center of the state. The city derives its name from a rock formation along the river, named "La Petite Roche" by the French in 1799. The capital of the Arkansas Territory was moved to Little Rock from Arkansas Post in 1821. The city's population was 193,524 at the 2010 census. The five-county Little Rock-North Little Rock-Conway, AR Metropolitan Statistical Area (MSA) is ranked 75th in terms of population in the United States with 724,385 residents according to the 2013 estimate by the United States Census Bureau.

Little Rock is a major cultural, economic, government and transportation center within Arkansas and the South. The city includes cultural institutions such as the Arkansas Arts Center, the Arkansas Repertory Theatre, and the Arkansas Symphony Orchestra, in addition to the hiking, boating, and other outdoor recreational opportunities. Little Rock's history is also available to residents and visitors in a variety of ways; history museums, historic districts or neighborhoods like the Quapaw Quarter, and historic sites like Little Rock Central High School. The city is the headquarters of Dillard's, Windstream Communications, Acxiom, Stephens Inc., University of Arkansas for Medical Sciences, Heifer International, the Clinton Foundation, and the Rose Law Firm. Other large corporations, including Dassault Falcon Jet and LM Wind Power have large operations in the city. State government is also a large employer, with most offices being located in downtown Little Rock. Two major Interstate highways, Interstate 30 and Interstate 40 meet in Little Rock, with the Port of Little Rock serving as a major shipping hub.

Los Angeles

Los Angeles (ⁱ/lɒs ˈændʒəlᵻs/ loss AN-jə-ləs or loss AN-jə-liss) (Spanish for "The Angels"), officially the City of Los Angeles and often known by its initials L.A., is the second-largest city in the United States after New York City, the most populous city in the state of California, and the county seat of Los Angeles County.

Situated in Southern California, Los Angeles is known for its mediterranean climate, ethnic diversity, sprawling metropolis, and as a major center of the American entertainment industry. Los Angeles lies in a large coastal basin surrounded on three sides by mountains reaching up to and over 10,000 feet (3,000 m).

Historically home to the Chumash and Tongva, Los Angeles was claimed by Juan Rodríguez Cabrillo for Spain in 1542 along with the rest of what would become Alta California. The city was officially founded on September 4, 1781, by Spanish governor Felipe de Neve. It became a part of Mexico in 1821 following the Mexican War of Independence. In 1848, at the end of the Mexican–American War, Los Angeles and the rest of California were purchased as part of the Treaty of Guadalupe Hidalgo, thereby becoming part of the United States. Los Angeles was incorporated as a municipality on April 4, 1850, five months before California achieved statehood. The city experienced rapid growth with the discovery of oil.