US Gazetteer > Colorado Gazetteer > Colorado ZIP Codes > County ZIP Codes > Boulder ZIP Codes

ZIP Codes in Boulder County with Associated Cities & Towns

Allenspark   80510
Boulder   80301
Boulder   80302
Boulder   80303
Boulder   80304
Boulder   80305
Boulder   80306
Boulder   80307
Boulder   80308
Boulder   80309
Boulder   80310
Boulder   80314
 Boulder   80321
Boulder   80322
Boulder   80323
Boulder   80328
Boulder   80329
ElDorado Sprg   80025
Eldorado Springs   80025
Erie   80516
Frederick   80516
Hygiene   80533
Jamestown   80455
Lafayette   80026
 Longmont   80501
Longmont   80502
Longmont   80503
Louisville   80027
Louisville   80028
Lyons   80540
Nederland   80466
Niwot   80544
Pinecliffe   80471
Superior   80027
Ward   80481

ZIP Codes - Key Concepts

  1. ZIP Codes are categories for grouping mailing addresses and are not exact geographic regions.
  2. The centroid of a ZIP Code may be in one County and the associated city/town in another.
  3. In rural areas, a single ZIP Code may be used for cities and towns in several different Counties.
  4. ZIP Code "areas" can overlap, be subsets of each other, or be artificial constructs with no geographic area.
  5. ZIP Codes are only loosely tied to cities.