As of this blog post, it appears that a 4th stimulus check is highly dependent on the state in which the recipient lives
California
In July, California announced a Golden Gate Stimulus program with payment to 5.7 million people. Income requirements are $30,000 and $75,000 per year. If a taxpayetr is in this range, they can receive one-time payments of $600, and households with dependents can receive an additional $500. Distribution of those payments began in September.
New York
In April, New York has apparently started offering one-time payments of up to $15,000 for undocumented immigrants who couldn’t work due to the pandemic. Applications are considered in the order received. Those interested but have applied yet should know that the state has mentioned that the fund is nearly empty.
New Mexico
One-time stimulus payments of $750 to more than 4,000 low-income households have been announced by New Mexico. This is for taxpayers didn’t receive federal stimulus payments. My understanding is that applications for this program are no longer accepted, and payments were issued in early August.
Maryland
In Maryland, taxpayers could have received up to $500. They would have needed qualifying income. Those payments were authorized and processed in February 2021.
Colorado
In Colorado, anyone who received unemployment benefits between March and October 2020 automatically received a one-time payment of $375.