The expression is quoted as the state motto of California, referring to the momentous discovery of gold near Sutter's Mill in 1848.
Several places in the United States of America are named for the expression:
There is also Eureka Springs, Arkansas.It is also the name of an asteroid co-orbital with Mars, 5261 Eureka (see also 3753 Cruithne)
It is also the name of the European Union's research and development organization, see EUREKA.