San Mateo Sun

In 2019, 17,747 people moved to San Mateo County from within the state, according to migration data from the Internal Revenue Service.

This is an increase over the year before, when 17,398 people migrated to San Mateo County from elsewhere in the state.

The number of people moving to San Mateo County is offset by the 30,295 residents who left the area during the same year.

There were 26,644 people who left the year before.

Migration data for the U.S. is based on year-to-year address changes reported on individual income tax returns filed with the IRS.

According to the U.S. Census Bureau, most U.S. regions saw their numbers shrink.

The Northeast region of the U.S. suffered the greatest losses, while the Midwest saw population growth.

The U.S. Census Bureau found migration within the country mainly flows to the South, with many people moving to areas of Florida and Texas.

Years	Inflow	Outflow	Domestic Migration
2017-2018	17,658	26,450	-8,792
2018-2019	17,398	26,644	-9,246
2019-2020	17,747	30,295	-12,548