The Rio Grande Valley added more than 66,000 residents during the past four years, according to new data from the U.S. Census Bureau, pushing the total population to more than 1.3 million.

Demographers at the Census Bureau released the latest population data on Thursday. The Census Bureau published county-level population estimates for July 1, 2014.

The Valley added nearly 14,900 residents from July 1, 2013, to July 1, 2014, according to the Census Bureau. That brought the four-year total to more than 66,000 new residents.

Both Hidalgo County and Starr County experienced faster population growth than Cameron County.

From July 1, 2013, to July 1, 2014:

Hidalgo County added about 12,100 residents, bringing the total population to about 831,000 people, according to the Census Bureau.

Cameron County added nearly 2,200 residents, bringing the total population to about 420,000 people, according to the Census Bureau.

Starr County added 565 residents, bringing the total population to nearly 63,000 residents, according to the Census Bureau.