The U.S. population has reached a nerdy and delightful milestone.

Shortly after 2:29 p.m. on Tuesday, August 14, 2012, the U.S. population was exactly 314,159,265, or pi (π) times 100 million, the U.S. Census Bureau reports. The U.S. Census Bureau's Population Clock projects the real-time size of the U.S. population based on monthly population estimates.

Pi (π) is a unique number in multiple ways. For one, it is the ratio of a circle's circumference to its diameter. It is also an irrational number, meaning it goes on forever without ever repeating itself. Are you remembering how much you loved geometry class? You can check out pi to one million places here.

Earlier on HuffPost:

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  • 10. Charlotte-Gastonia-Rock Hill, NC-SC

    Population in 2012: 1,830,400 Estimated population in 2042: 3,014,900 Percentage change: 64.7 percent

  • 9. Dallas-Fort Worth-Arlington, TX

    Population in 2012: 6,669,000 Estimated population in 2042: 11,034,000 Percentage change: 65.5 percent

  • 7. Salt Lake City, UT (Tied)

    Population in 2012: 1,166,600 Estimated population in 2042: 1,947,000 Percentage change: 66.9 percent

  • 7. Las Vegas-Paradise, NV (Tied)

    Population in 2012: 1,988,700 Estimated population in 2042: 3,320,000 Percentage change: 66.9 percent

  • 6. Atlanta-Sandy Springs-Marietta, GA

    Population in 2012: 5,447,000 Estimated population in 2042: 9,141,000 Percentage change: 67.8 percent

  • 5. Orland-Kissimmee-Sanford, FL

    Population in 2012: 2,207,800 Estimated population in 2042: 3,976,300 Percentage change: 80.1 percent

  • 4. Riverside-San Bernardino-Ontario, CA

    Population in 2012: 4,381,000 Estimate population in 2042: 8,011,000 Percentage change: 82.9 percent

  • 3. Raleigh-Cary, NC

    Population in 2012: 1,194,100 Estimated population in 2042: 2,227,300 Percentage change: 86.5 percent

  • 2. Phoenix-Mesa-Scottsdale, AZ

    Population in 2012: 4,332,000 Estimated population in 2042: 8,161,000 Percentage change: 88.4 percent

  • 1. Austin-Round Rock-San Marcos, TX

    Population in 2012: 1,844,000 Estimated population in 2042: 3,521,200 Percentage change: 91 percent