The number of congregations in the United States of America that regard themselves as “Anglican” but “outside of ECUSA” is already quite large. Some of these go back to the nineteenth century. There is an interesting map here, which shows a total of 457, although it also says that it is incomplete. These numbers include a few Canadian parishes (see comments).
This total breaks down as follows:
Groups which are directly linked to some other province of the Anglican Communion:
AMiA-113, Southern Cone-26, Uganda-23, Nigeria-15, Kenya-14, Brazil-Recife-6
The AMiA is, according to its own website “a missionary outreach of the Province of the Episcopal Church of Rwanda”.
APA-71, REC-38, ACA-36, EMC-27, UEC-25, Unknown-18, CEC-17, UAC-12, , ACiC-6, APCK-4, OAC-2, DHC-2, ACCC-1, APCGS-1
More information about these groups can be found in the Anglicans Online list of ‘Not in the Communion’.
AMiA, APA, and REC are Common Cause Partners as is CANA.