any other country other than this?
Australia, Brazil and Canada
State highway
Australia's State Route system covers urban and inter-regional routes that are not included in the National Route or the National Highway systems. 
where is washington state route 544 situated? Northern Whatcom County, Washington, United State which places does it connects? SR 539 near Lynden to Everson and a junction with SR 9 in Nooksack when was it opened? 1930s is this a highway? Yes. A state highway what is meant by this term you used just now? A road that is either "numbered" or "maintained" by a sub-national state or province is it present in india? Yes
wiki:4730608
State highway [SEP] Australia
Australia's State Route system covers urban and inter-regional routes that are not included in the National Route or the National Highway systems. These routes are marked with a blue shield. Sometimes a state route may be formed when a former national route is decommissioned. Most states and territories have introduced an alphanumeric route numbering system, either completely or partially replacing the previous systems.