Question: According to the agency that published U.S. and World Population Clock, what is the total area in square miles?

Knowledge 1: U.S. and World Population Clock
The U.S. and World Population Clock presents the United States Census Bureau's continuously active approximations of both the population of the United States and the world's total population. The population totals are based on the latest census information and national population estimates, which are used in the algorithms that run the two clocks. [SEP] Knowledge 2: Riverside, California
Riverside is the 59th largest city in the United States, 12th largest city in California, and the largest city in California's Inland Empire metro area. According to the United States Census Bureau, the city has a total area of 81.4 square miles (210.8 km), of which 81.1 square miles (210 km) is land and 0.3 square miles (0.78 km) (0.37%) is water. The elevation of downtown Riverside is 860 feet (260 m). Hills within the city limits include Mount Rubidoux, a city landmark and tourist attraction. Riverside is surrounded by small and large mountains, some of which get a dusting of winter snow. Many residents also enjoy the many beaches of southern California. Riverside is about a 47 - mile drive to the Pacific Ocean and is close to Orange county and Los Angeles county.
Knowledge 1: U.S. and World Population Clock
The U.S. and World Population Clock presents the United States Census Bureau's continuously active approximations of both the population of the United States and the world's total population. The population totals are based on the latest census information and national population estimates, which are used in the algorithms that run the two clocks. [SEP] Knowledge 2: United States
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self - governing territories, and various possessions. At 3.8 million square miles (9.8 million km) and with over 325 million people, the United States is the world's third - or fourth - largest country by total area and the third-most populous. The capital is Washington, D.C., and the largest city by population is New York City. Forty - eight states and the capital's federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The state of Hawaii is an archipelago in the mid-Pacific Ocean. The U.S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The extremely diverse geography, climate, and wildlife of the United States make it one of the world's 17 megadiverse countries.
Knowledge 1: U.S. and World Population Clock
The U.S. and World Population Clock presents the United States Census Bureau's continuously active approximations of both the population of the United States and the world's total population. The population totals are based on the latest census information and national population estimates, which are used in the algorithms that run the two clocks. [SEP] Knowledge 2: Pollock, Louisiana
Pollock is located in southeastern Grant Parish at 31 ° 31 ′ 29 ''N 92 ° 24 ′ 32'' W ﻿ / ﻿ 31.52472 ° N 92.40889 ° W ﻿ / 31.52472; - 92.40889 (31.524760, - 92.408866) and has an elevation of 118 feet (36.0 m). U.S. Route 165 is the main highway through the town, leading north 16 miles (26 km) to Georgetown and south 16 miles to Alexandria. According to the United States Census Bureau, the town has a total area of 1.3 square miles (3.3 km), all land.

Answer: 17.037 square miles