Nine Bay Area Counties | What Is MTC? | About MTC

Nine Bay Area Counties

Stretching from the Wine Country in the north to Silicon Valley in the south, from the shores of the Pacific to the edge of the Central Valley, our region houses more than 7 million people in nine counties and 101 cities.

A satellite view of the Bay Area
A satellite view of the Bay Area

Our Bay Area

The nine counties that touch San Francisco Bay are:

  • Alameda
  • Contra Costa
  • Marin
  • Napa
  • San Francisco
  • San Mateo
  • Santa Clara
  • Solano
  • Sonoma

These nine counties include 101 cities, 7.4 million inhabitants and approximately 7,000 square miles of land.

Our region is home to three major cities, San Francisco, San Jose and Oakland.

The Bay Area includes Silicon Valley, a leading hub for high-tech innovation and development, and a big factor in predicting future Bay Area growth.

MTC collaborates with dozens of agencies and organizations to manage and maintain the transportation needs of people like you, and the thousands of businesses that call the Bay Area home.

What will the Bay Area be like in 2040?

The region boasts nearly 20,000 miles of local streets and road, 1,400 miles of highway, five public ports and three major commercial airports.

More than two dozen public transit agencies operate in the region, and passengers make more than 2 million trips a day in 4,000-plus transit vehicles (not including paratransit vehicles).The combined annual operating budget of the transit agencies was over $2.5 billion in 2013-14, placing this region among the top transit markets in the nation. 

As the Bay Area grows and changes, so do we.

The Bay Area has made farsighted regional planning a top priority for decades.

Plan Bay Area represents the latest step in this long tradition.

The plan is a long-range integrated transportation and land-use/housing strategy through 2040 for the San Francisco Bay Area.

Learn more about our future when you visit the Plan Bay Area website.

Ranked by population, the Bay Area is the fourth-largest metropolitan area in the U.S.

Find out where we live, what cities are growing the fastest and much more on our interactive website, Vital Signs.


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