San Francisco International Airport (SFO) is located in unincorporated San Mateo County, California. It is situated near the cities of Millbrae and San Bruno, south of downtown San Francisco. The airport is a major gateway to Europe, Asia, and other destinations around the world, serving as a hub for several airlines.

San Francisco International Airport (SFO) is located about 13 miles south of downtown San Francisco, California, near the cities of Millbrae and San Bruno. It is situated near the edge of the San Francisco Bay. Here are some notable places and attractions near SFO:

1. Millbrae and San Bruno: These are the closest residential communities to SFO, offering a range of hotels, dining options, and basic services for travelers.

2. Burlingame: Just north of the airport, Burlingame offers a pleasant downtown area with shopping, dining, and a number of hotels along the Bayfront, particularly along Airport Boulevard.

3. South San Francisco: Known for its biotech industry, South San Francisco is located to the north of the airport. It's home to a number of business parks and industrial areas.

4. San Mateo: A bit further south of the airport, San Mateo offers a larger downtown area with a variety of shopping, dining, and entertainment options.

5. Coyote Point Recreation Area: Located to the northwest of the airport, this park offers picnic areas, a marina, and the CuriOdyssey science and wildlife center, making it a great spot for families.

6. Oyster Point Marina/Park: North of the airport, this area offers beautiful views, trails, and facilities for boating and fishing.

7. The Bay Trail: This extensive trail system offers walking and biking paths along the San Francisco Bay, with several segments accessible near the airport.

8. San Francisco Bay: The airport is located right by the bay, offering scenic views and opportunities for bird watching and other nature activities.

9. Downtown San Francisco: Although not immediately adjacent to the airport, downtown San Francisco is easily accessible via the BART (Bay Area Rapid Transit) system, with its numerous attractions like Fisherman's Wharf, Alcatraz Island, the Golden Gate Bridge, and more.

10. Pacifica and the Pacific Coast: To the west of the airport, Pacifica and the coastline offer beaches, hiking, and scenic views of the Pacific Ocean.

The area around SFO is well-connected by public transportation, including BART and Caltrain, making it easy to explore the wider San Francisco Bay Area.

As of my last update in 2023, San Francisco International Airport (SFO) is one of the busiest airports in the United States and a major gateway for international flights, especially between the U.S. and Asia. It serves as a hub for United Airlines and Alaska Airlines. The airport has four terminals (including the International Terminal) and serves tens of millions of passengers annually.

The exact passenger traffic can fluctuate due to various factors, including economic conditions, airline operations, and global events such as the COVID-19 pandemic, which significantly impacted air travel worldwide. However, SFO has consistently ranked among the top 25 busiest airports in the world by passenger numbers in the years leading up to the pandemic.

To get the most current information on passenger traffic, flight operations, or any specific data related to how busy SFO is at the moment, it would be best to consult the airport's official website or recent traffic reports from relevant aviation authorities.