The Southmore Post Office on Almeda is one of six locations that could be relocated.
But community activists want to keep the post office in that location because of the role it played in Houston's history.
It's the same location where Texas Southern University students held Houston's first sit-in demonstration back in 1960.
On Friday, a notice was posted on the post office announcing it would be closed. The U.S. Postal Service says the notice was released prematurely, but Congresswoman Sheila Jackson Lee calls the move insensitive.
"Millions of Americans do not have a bank account, or use costly services like payday loans and check cashing exchanges just to make ends meet. The Southmore Post Office is important for this neighborhood and city. The entire underserved population comprises more than a quarter of all U.S. households — some 68 million adults. They are an economically diverse mix of working and middle class families, poor and unemployed people hurt by the recent economic crisis, young people, immigrants, and others who are trying to make it paycheck to paycheck. Together, they represent a huge market. In 2012, they spent about $89 billion just on interest and fees for alternative financial services," Jackson Lee said in a prepared statement.
Jackson Lee and Congressman Al Green led the group Saturday as they marched to raise awareness.
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