Emergency Management Ontario says residents of the James Bay communities of Kashechewan First Nation and Moosonee will return home over a period of several days.
The 169 Moosonee residents evacuated to Sudbury and Temiskaming Shores began returning to the town on Wednesday.
Nearly 100 Kashechewan residents evacuated to Greenstone will be the first to return to the First Nation.
A group evacuated to Kapuskasing will not return to Kashechewan until their homes have been cleaned and inspected following flooding and sewer backup.
In the other James Bay communities of Moose Cree First Nation and Attawapiskat First Nation, local leaders continue to monitor water levels on the Moose and Attawapiskat rivers and assess flood risks.