Mollie Tibbetts' family says the reward to find her is now up to $30,000.
A family member posted Wednesday on Facebook that the reward has been increased.
Mollie's boyfriend Dalton Jack said community work to find her is "heartwarming". He says it's good to know that the team of people working to find her "have your back."
Anyone with information that may be helpful to the case is asked to call 1-800-452-1111 or email tips@Poweshiekcosheriff.com.
Donations for the reward are being accepted at First State Bank, 104 Jackson St, P.O. Box 532, Brooklyn, IA, 52211.
Poweshiek County officials say they've followed over 200 leads in the case.
Meanwhile, the Waterloo community's holding a vigil for all missing children tonight. It takes place at 7pm at the Riverloop Amphitheater on the Waterloo riverfront. It's sponsored by Safe Kids Cedar Valley.