The home stay order, which allows for certain exceptions such as groceries and solitary exercise, was originally scheduled to expire on April 13.
The announcement was made Thursday the same day that Louisiana reported more than 2,700 new cases of coronavirus and 37 new deaths.
Since the start of the epidemic, Louisiana has recorded more than 9,100 cases and more than 300 deaths from coronavirus.
The state health department said about 95% of new positive test results came from tests done in commercial laboratories.
“Although extremely upsetting, this increase in COVID-19 cases appears to be less a sign of exponential new growth and more a sign of a blockage in commercial laboratories,” Edwards said in a statement.
“I have said it again and again – COVID-19 is a statewide problem and testing is a vital step in understanding the magnitude of this problem. We believe COVID-19 is spreading in every parish in Louisiana. “
The governor implored the public to help stop the spread of the coronavirus.
“The situation remains worrying, but every Louisiana citizen has the power to change our path,” said Edwards. “Think of your neighbors and stay at home. “
CNN’s Kay Jones contributed to this report.