Kids Against Hunger
Although our main focus is on feeding starving children abroad, we also help children and their families within the U.S. The recommendation we give to our food packaging centers (we call them "satellites") is to ship 2/3 of the packaged meals abroad and have 1/3 of them remain within the local community. Some of our satellites focus almost exclusively on helping children and their families in the U.S., e.g. through outreach to inner city families, homeless people, Native American reservations, seniors, and children.
The main reason we are focusing on other countries in the first place is because even though you will find HUNGRY people within the U.S., you won't find STARVING people. People in this country have food shelves and other places to assist them, whereas kids in foreign countries do not.