Houston, (Agencies): According to a new report, although the number of illegal immigrants living in the US remains virtually unchanged in 2010 from a year earlier, but their population in Texas continued to grow.

The number of unauthorized immigrants in the nation's workforce, 8 million in March 2010, also did not differ from the Pew Hispanic Center estimate for 2009.

As with the population total, the number of unauthorized immigrants in the labor force had decreased in 2009, from its peak of 8.4 million in 2007.

"The evidence is pretty strong," said D'Vera Cohn, co-author of the report for the Washington-based nonpartisan research group the Pew Hispanic Center.

Cohn said a definite conclusion couldn't be made because the methodology used in compiling the estimates creates a wide margin of error for state-level figures.

Texas, Louisiana and Oklahoma bucked the national trend and continued to gain illegal immigrants since 2007, she said.

"The change was not statistically significant for these states individually, but it was for the combined three states," the report said.

In 2007, Louisiana, Oklahoma and Texas had a combined 1.55 million illegal immigrants. In 2010, that number had grown to 1.8 million, the report said.

The number of illegal immigrants in the US peaked in 2007 at 12 million before declining in 2008 and again in 2009, marking the first significant reversal in a two-decade pattern of growth, according to report.

In 2010, it said, the total number of illegal immigrants stabilized nationwide as well as in the nation's work force.

It said the 8 million illegal immigrants in the work force in March 2010 did not differ from the center's estimate in 2009.

But for Texas, the number of total illegal immigrants reached 1.65 million last year. It was second only to California, which led the nation with 2.55 million illegal immigrants.

Texas also had the second-highest number of illegal immigrants in the work force with an estimated 1.1 million. Again, second only to California, which had 1.85 million.

Cohn said the study didn't analyze the change in illegal immigrants in the work force in 2010 from 2009.

However, in announcing the stable numbers of illegal immigrants on a national level, the report did observe that even though the deep recession in the US officially ended in 2009, recovery has been slow and unemployment remains high.

The report also noted changes in immigration enforcement, not only by the federal government, but also by some state and local officials.