There's some overlap in countries where marches are planned for the second year in a row — but some noticeable differences.
In the Middle East, for example, marches were held in several countries last year, including Saudi Arabia, Jordan and Lebanon. But this year, the Women's March organization hasn't listed any marches expected to happen in that region.
Demonstrations happening around the world are built on sentiments of the U.S.-based Women's March organization.
The messages across the U.S. and worldwide have some common threads: "Power to the Polls" and "Look Back, March Forward."
The main march for 2018 is happening in Las Vegas.