The estimated population of San Francisco proper has inched up from 880,400 in July of 2017 to 884,000 as of January 1, 2018, according to the latest data from California’s Department of Finance.
As such, San Francisco’s population increased by roughly 10,000 (1.14 percent) in 2017, with 64 percent of the growth occurring in the first half of the year and a total annual growth rate of 1.14 percent (versus an average annual rate of around 1.3 percent since 2010 and having peaked at 1.6 percent from 2011 to 2012).
Across the greater Bay Area, the estimated population grew by 0.76 percent (58,800) in 2017 to 7,772,600, with Santa Clara County leading the way in terms of growth in the absolute (up 19,100 to 1,956,600), followed by Alameda County (up 13,800 to 1,660,200) and the populations in Sonoma and Napa having slipped post-wildfires, as we’ve tabled below:
| January 1, 2017 | January 1, 2018 | YoY Growth | Rate | |
| Alameda | 1,646,405 | 1,660,202 | 13,797 | 0.84% |
| Contra Costa | 1,139,313 | 1,149,363 | 10,050 | 0.88% |
| Marin | 263,262 | 263,886 | 624 | 0.24% |
| Napa | 141,784 | 141,294 | -490 | -0.35% |
| San Francisco | 874,008 | 883,963 | 9,955 | 1.14% |
| San Mateo | 770,256 | 774,155 | 3,899 | 0.51% |
| Santa Clara | 1,937,473 | 1,956,598 | 19,125 | 0.99% |
| Solano | 436,640 | 439,793 | 3,153 | 0.72% |
| Sonoma | 504,613 | 503,332 | -1,281 | -0.25% |
| Total | 7,713,754 | 7,772,586 | 58,832 | 0.76% |