Eureka is a populated place LOCATED WITHIN the City of Bellingham. In turn, the City of Bellingham is located within Whatcom County.
Eureka is located at latitude 48.763 and longitude -122.452.
Since Eureka is located within the City of Bellingham, all of the census and demographic data for residents of Eureka are included as part of the information reported for City of Bellingham in the "Profile" tab above.