| Building Proposed | mid-July 1941 |
| Prime Contract Awarded | 11 August 1941 |
| Mechanical Engineering Contract Awarded | 3 September 1941 |
| Construction Began | 11 September 1941 |
| Grading Contract Awarded | 24 September 1941 |
| First Occupants Move in | 29 April 1942 |
| Construction Completed | 15 January 1943 |
| Sand & Gravel Used for Concrete (tons) | 680,000 |
| Buildings Consolidated to Populate the Pentagon | 17 |
 Most of the statistical data presented here is approximate, even when the numbers are not rounded. Most of this data was compiled in the 1950s. Changes in the building since have resulted in changes in the numbers, making difficult to render precise figures.
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Facts & Figures: Construction
Facts & Figures
GENERAL INFORMATION
"The Pentagon has no marble because it was built during World War II, and Italy, the source of marble, was an enemy country."