Do you want both conditions in the same pass, or in two separate passes?
This should work if you stick with using the "Country" property.
# Remote users in US
get-aduser -Filter * -properties Office,Country|
Where-Object {$_.Office -like "Remote,*" -And $_.country -eq "US"} |
Select-Object Name, Office, Country
# Users in the state of Florida, US
get-aduser -Filter * -properties Office,Country|
Where-Object {$_.Office -match "^FL," -And $_.country -eq "US"} |
Select-Object Name, Office, Country
The "co" property is just "United States", isn't it?