Two-thirds of the world's infrastructure is privately owned, but much of the rest belongs to U.S. cities, counties, and states.

In fact, the world's 500 largest infrastructure owners include 34 states, eight cities, and two counties. California, Florida, New York, North Carolina, and Texas each own more than all branches of the U.S. military except the Army, as does New York City, New York City Transit (subays and buses), and the city's Metropolitan Transportation Authority (commuter rail).

At $283 billion the U.S. government heads the list, which ultimately totals $13 trillion worldwide.

Using published financial statements and third-party research, software developer Bentley Systems Inc. compiled the list based on cumulate net investment as measured by reported net tangible fixed assets over the last three years. Values are assessed net of depreciation and amortization and calculated to exclude whenever possible assets, such as equipment, furniture, and software, that aren't infrastructure.

Not surprisingly, U.S. oil and telecommunications companies such as Exxon Mobil Corp., Chevron Corp., Conocophillips, AT&T Inc., and Verizon Communications Inc., were among the top 50.

Other rankings of interest to the nation's public works professionals:

  • General Electric Co. (#33)
  • Union Pacific Corp. (#118)
  • Burlington Northern Santa Fe Corp. (#130)
  • Department of Energy (#131)
  • Tennessee Valley Authority (#133)
  • University of California (#183)
  • CSX Corp. (#225)
  • General Services Administration (#266)
  • Port Authority of New York & New Jersey (#232)
  • Department of Homeland Security (#259)
  • Norfolk Southern Corp. (#299)
  • U.S. DOT (#319)
  • Federal Aviation Administration (#338)
  • Calpine Corp. (#401)
  • Waste Management Inc. (#403)
  • Puerto Rico Highway & Transportation Authority (#411)
  • Visit to be considered for next year's Bentley Infrastructure 500.