New census figures show SF, Bay Area emigration patterns 

Despite a year-over-year population boom -- mostly due to immigration from Asian countries -- more people moved out of San Francisco in recent years than into The City, and most of that movement was from within California and the Bay Area, according to new U.S. Census Bureau migration data from 2008 to 2012.

While domestically, on average every year, 61,268 people moved out of The City in that period, only 49,256 moved in. An additional 11,947 people moved in to The City during that period, but no data is available for how many left for foreign countries.

The data comes from annual surveys of people in San Francisco.

Nearly two-thirds of all people who moved to San Francisco from within California -- about 20,000 -- came from other Bay Area counties. Those same counties received more than 30,000 souls from San Francisco alone, which accounted for almost three-quarters of all people who left The City and relocated within the state.

More than 17,000 people left The City for another state and nearly 16,000 came here from another state.

But the newly released data also indicates that despite the large trading of populations in the Bay Area, the net result has not been an even trade between counties.

For instance, roughly 1,100 more people from Santa Clara County moved into San Francisco than moved to Santa Clara County from The City. The same was true, although to a lesser extent, for San Diego and Los Angeles counties.

The converse was true for most other Bay Area counties.

More people moved from San Mateo County to The City than any other county, yet the Peninsula received 4,866 more people from San Francisco than came north.

The same goes for Alameda County -- the second-most prominent local exporter of people to The City -- which took in 3,606 more San Francisco residents than went west.

Similarly, but to a lesser extent, nearby Marin and Contra Costa counties had more people moving to them from San Francisco than the opposite.

Previous census data from 2007 to 2011 showed that nearly 10,000 people moved to San Francisco from the Peninsula and South Bay. But more than 11,000 San Franciscans also moved south to San Mateo County and 2,819 people headed for Santa Clara County.

At the same time, more than 8,000 crossed the Bay Bridge to Alameda County and nearly 5,000 came to San Francisco from Alameda County.

All of this movement speaks to one overarching phenomena: population growth.

From 2010 to 2012, San Francisco's population grew by about 20,000 people, according to estimates from the Census Bureau.

The City's estimated population for 2013 stands at 837,442, the highest population San Francisco has had in its entire history as a city.

On the move

New census data on San Francisco residents' movement patterns:

San Mateo County: to S.F., 5,985; from S.F., 10,851

Alameda County: to S.F., 5,105; from S.F., 8,711

Santa Clara County: to S.F., 4,358; from S.F., 3,258

Contra Costa County: to S.F., 1,989; from S.F.; 4,573

From different state to S.F.: 15,941

From S.F. out of California: 17,031

From another county in California to S.F.: 33,275

From S.F. to another county in California: 44,237

From abroad to S.F.: 11,947

Births and deaths

2010 birth rate per 1,000 female residents of birthing age: 47.6

2010 death rate per 100,000 residents: 600

The difference: about 140 more births than deaths

Source: U.S. Census Bureau

About The Author

Jonah Owen Lamb

Jonah Owen Lamb

Born and raised on a houseboat in Sausalito, Lamb has written for newspapers in New York City, Utah and the San Joaquin Valley. He was most recently an editor at the San Luis Obispo Tribune for nearly three years. He has written for The S.F. Examiner since 2013 and covers criminal justice and planning.
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