The longest bridge on earth is in what country?

Answer 1

1. Bang Na Expressway.   Bangkok, Thailand.   Completed in 2000.

  33.6 miles long (54 km). The span is 144 feet (44 m).  

2. Lake Pontchartrain north of New Orleans in the USA, the longest bridge since 1956 until Bang Na Expressway took over the number one spot in 2000.

Answer 2

If you want to know the longest span, the distance between support towers, its the Akashi-Kaikyō Bridge in Japan (1,991 meters). It opened in 1998 so it fits your request.

Answer 3

Donghai Bridge - Donghai Bridge (literally “East Sea Grand Bridge”) is the longest cross-sea bridge in the world and the longest bridge in Asia. It was completed on December 10, 2005. It has a total length of 32.5 kilometres (20.2 miles) and connects Shanghai and the offshore Yangshan deep-water port in China. Most of the bridge is a low-level viaduct. There are also cable-stayed sections to allow for the passage of large ships, largest with span of 420 m.

Lake Pontchartrain Causeway - The Lake Pontchartrain Causeway, or the Causeway, consists of two parallel bridges that are the longest bridges in the world by total length.[2] These parallel bridges cross Lake Pontchartrain in southern Louisiana. The longer of the two bridges is 23.87 miles (38.42 km) long. The bridges are supported by over 9,000 concrete pilings. The two bridges feature bascule spans over the navigation channel 8 miles (13 km) south of the north shore. The southern terminus of the Causeway is in Metairie, Louisiana, a suburb of New Orleans. The northern terminus is at Mandeville, Louisiana.

EDIT - technically speaking the Expressway in Bangkok is an elevated roadway