US Based Toll Free Numbers?

We have been using Zoom Meetings for a while and we recently upgraded our audio to include the Audio Conferencing Plan. After looking at the US based numbers we realized we didn't see any US Toll Free Numbers. There are 5 US Toll numbers to choose from, but no Toll Free numbers. There are Toll Free Numbers for Lebanon and the United Kingdom, but not the US. Does anyone one know if it is offered for the US?