Florida's Port of Jacksonville is offering available berths to containerships that are waiting at anchorage to offload at other US ports that became congested amid Covid-19 disruption.

The ports of Los Angeles and Long Beach are the most backed-up ports in the country, leaving 77 boxships laden with goods from China stranded in San Pedro Bay as of Monday.

"Our port workers, terminal operators and service providers have shown the world that Jaxport is a solution to the nation's port congestion problem," Port of Jacksonville chief executive Eric Green said in a statement.