The American Red Cross and other organizations are accepting donations to help those affected by Harvey.
Harvey made landfall in southeast Texas late Friday as a Category 4 hurricane. It lingered over Houston as a tropical storm, causing unprecedented flooding and stranding residents who remained in their homes. Early Wednesday, Harvey made a second landfall, this time hitting southwestern Louisiana.
The Red Cross is calling for blood donations, being accepted throughout the country, on its website.
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The Red Cross is also accepting donations online, which can be paid with a credit card or Pay Pal. You can call 1-800-RED CROSS or make a $10 donation by texting "HARVEY" to 90999. (The Red Cross reported that there were some delays with donations by text message after being inundated).
Other organizations are accepting donations as well. The National Voluntary Organizations Active in Disaster group has a collection of member organizations who may be taking both donations and volunteers to help the flood-stricken region. Find out more on the NVOAD website.
The city of Houston established a relief fund, administered by the Greater Houston Community Foundation, accepting tax-deductible donations online or by check, money order, wire transfer or financial assets.
And the Houston Independent School District is accepting donations through its regular donation page.
Learn more about federal disaster response at disasterassistance.gov.
NBC News also has a list of more places to give here.