A $25,000 reward was offered for information in the disappearance of the child, whose father said was taken during a Dec. 2 carjacking, the Detroit Free Press reported.
On Sunday, the last official day of the search, 138 volunteers patrolled streets, alleys and fields, looking for the girl.
Police said more than 1,100 people volunteered during the search, which began Dec 5.
"Except for Angel's Night [a volunteer-driven effort to keep Detroit safe around Halloween], I can't recall a time when this many volunteers came forward," said Sgt. Eren Stephens, Detroit police spokeswoman.
"It's good to come together as a community," volunteer Karl Janka, 45, said. "I'm a parent myself and it's good to continue to give the family hope, to show that the community still cares."
The girl's father D'Andre Lane, 32, called police on the morning of Dec. 2 and reported being carjacked. Lane told police his daughter was in the back seat. Police found the car about 10 minutes later, but the girl was gone.
Lane's story was questioned by police and he failed a polygraph test, the report said. Lane said he has received a number of death threats since police began questioning his story.
"Some people are out here to find the baby and I hope we do. But as a police officer and a father, we're also looking for evidence," said officer Lawrence Smith.