"We are struggling to catch up with the rest of the nation. L.A. County is the largest county in America. We have the most at stake," said Alex Padilla, California Secretary of State.
An undercount in these communities would mean less funding for services. Congress allocates billions of dollars according to the census counts.
"It's these communities, these immigrant communities, that actually rely on the resources the most. So it's really only hurting those immigrant communities when we don't respond," said Judith Vasquez with Los Angeles County.
The latest census numbers show across the state the response rate is at 67.3 percent.
But certain groups such as the Korean community it's at 61.8 percent, the African-American community is at 59.6% and the Latino community is at 57.3%.
"Part of that is again due to lack of information about how the census can bring back resources to their community," said David Tucker with CA Complete Count Office.
Tucker also worries California will likely lose at least one house seat. Redistricting would change who represents some communities.
"Minority-populated centers, they may now get lumped in to another section of their community, so the person that they trust to represent their issues may not now be that represents you going forward," said Tucker.
Some might not fill out the census because they fear the information could be used against them. Padilla stresses that is illegal.
"The personal information that we do submit to the census is protected by federal law. It is secure. It is confidential," said Padilla.
The census count is currently set to end on Sept. 30. But across the country some groups are suing, hoping to extend it until the end of October. The case likely will be appealed to the U.S. Supreme Court.
Billboard campaign motivates East LA residents to complete census