On OpenStreetMap
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Regions with same name.
Badge of United States of AmericaUnited States of America Badge of ColoradoColorado  Badge of Boulder CountyBoulder County 

Unowned Region

Boulder unruled Boulder

Yet 14 distinct quadrants have been played within the region Boulder.
When? Ruler Mapper
Current Score
For more information about rulers or mappers, look at this Page in our Wiki.

Sibling Regions of Boulder

Played regions on same layer like Boulder yet:
Neither Ruled nor Mapped Sibling Regions up to now: Lafayette, Longmont.