Here are a few options that exist.
Creating a profile is free with an email address and a few basic details.
Through the Stir app, users can start conversations with other single parents that capture their interest.
Plenty of Fish
Plenty of Fishis a free dating site for singles worldwide.
eHarmony
eHarmonyshares several statistics on its website.
A basic membership is free.
SingleParentMeet.About single parents and dating.
App Store Preview.Stir - Single parent dating.
Plenty of Fish.About POF.
Plenty of Fish.Study: Single mothers find partners faster.