ZIP Codes Box

Boulder County, Colorado ZIP codes

26ZIP codes
13Cities and towns
349,237People in ZIP areas
303, 720, 970Area codes

Boulder County is in Colorado and the Mountain Time zone. ZIP codes don’t follow county lines exactly, so a ZIP code listed here can reach into a neighboring county.

All ZIP codes in Boulder County

ZIP codeCityTypePopulationMedian income
80025Eldorado SpringsPO Box only138$134,102
80026LafayetteStandard32,701$120,187
80027LouisvilleStandard34,127$154,232
80301BoulderStandard25,007$95,207
80302BoulderStandard29,569$61,698
80303BoulderStandard24,996$78,555
80304BoulderStandard25,383$126,558
80305BoulderStandard16,291$126,107
80306BoulderPO Box only––
80307BoulderPO Box only––
80308BoulderPO Box only––
80309BoulderUnique––
80310BoulderUnique7,692–
80314BoulderUnique––
80455JamestownStandard501$169,286
80466NederlandStandard3,599$100,962
80471PinecliffePO Box only––
80481WardStandard484$116,563
80501LongmontStandard44,147$80,911
80502LongmontPO Box only––
80503LongmontStandard35,846$113,620
80504LongmontStandard63,451$113,643
80510AllensparkStandard663$101,250
80533HygienePO Box only––
80540LyonsStandard4,642$139,521
80544NiwotPO Box only––

Cities and towns in Boulder County

Area codes in Boulder County

Questions

How many ZIP codes are in Boulder County, CO?
Boulder County has 26 ZIP codes, 15 of them standard ZIP codes for street addresses.
What cities are in Boulder County?
Boulder County ZIP codes cover Boulder, Longmont, Allenspark, Eldorado Springs, Hygiene, Jamestown, Lafayette and Louisville and 5 other places.
What area code is Boulder County, CO?
Boulder County uses area codes 303, 720, 970 and 983.
What time zone is Boulder County in?
Boulder County is in Mountain Time.

Other Colorado counties