PlainCities

Census tracts · Boulder, CO

Census tracts in Boulder, Colorado

26 census tracts lie mostly within Boulder, and 8 more reach into it, by the 2020 census blocks they share. Median household income runs from $23,590 in Tract 126.10 to $244,179 in Tract 121.01, against $87,493 for Boulder as a whole (ACS 2020-2024 5-year estimates).

Which census tracts of Boulder earn the most and the least?

The five tracts with the highest and the lowest median household income among those mostly within Boulder and with a reliable estimate.

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

Every census tract in Boulder

Sort by any column; the share column is how much of each tract's land (by 2020 census blocks) lies inside Boulder.

Census tracts in or partly in Boulder, ACS 2020-2024 5-year estimates. Distance and direction from the Census Bureau's internal point of Boulder (2024 Gazetteer), which is not always its downtown
Tract 121.06080130121061.4 mi westBoulder County2,628±319$132,227$1,199,700$2,421100%
Tract 121.07080130121070.9 mi northwestBoulder County4,377±626$99,948$1,057,800$2,219100%
Tract 122.04080130122041.6 mi westBoulder County3,346±622$51,583$1,597,600$1,959100%
Tract 122.05080130122050.9 mi westBoulder County3,306±631$52,262$973,400$1,813100%
Tract 122.06080130122060.8 mi southwestBoulder County3,095±433$34,183$576,900$1,797100%
Tract 123080130123001.5 mi southwestBoulder County7,025±247$33,750not published$1,548100%
Tract 124.01080130124011.9 mi southwestBoulder County7,424±1,035$38,961$1,602,200$3,053100%
Tract 125.07080130125072.2 mi southBoulder County4,043±522$53,971$900,700$2,150100%
Tract 125.09080130125093.2 mi southBoulder County3,361±468$184,116$1,146,300$3,500 or more100%
Tract 125.11080130125112.2 mi southBoulder County6,066±349$79,385$906,000$1,959100%
Tract 126.05080130126050.9 mi southBoulder County1,933±466$40,038$654,600$2,014100%
Tract 126.08080130126081.5 mi southBoulder County2,279±303$113,125$776,300$2,164100%
Tract 126.09080130126091.4 mi southBoulder County1,362±294$30,119$577,900$1,826100%
Tract 126.10080130126101.4 mi southBoulder County5,294±624$23,590$372,100$1,775100%
Tract 122.08080130122080.7 mi eastBoulder County2,350±278$95,671$691,800$2,38499%
Tract 125.05080130125053.7 mi southwestBoulder County4,100±437$184,353$1,675,500$2,46197%
Tract 126.03080130126031.5 mi southeastBoulder County3,450±424$136,576$1,089,300$2,64195%
Tract 121.05080130121052.3 mi northwestBoulder County6,180±773$102,112$886,600$2,22494%
Tract 121.01080130121012.1 mi westBoulder County4,800±609$244,179$2,000,000 or more$2,14693%
Tract 122.07080130122070.8 mi northeastBoulder County4,899±573$77,965$410,200$1,91193%
Tract 122.01080130122012.9 mi southwestBoulder County3,402±534$123,250$2,000,000 or more$2,18788%
Tract 121.04080130121042.6 mi northwestBoulder County2,307±222$155,313$1,268,900not published84%
Tract 125.08080130125083.4 mi southBoulder County2,637±262$97,019$828,900$2,08582%
Tract 125.01080130125012.9 mi southeastBoulder County2,653±569$110,500$840,600$1,97671%
Tract 121.03080130121031.8 mi northwestBoulder County3,318±386$118,750$1,188,100$2,15865%
Tract 127.05080130127053.4 mi northeastBoulder County5,200±827$91,429$543,700$1,96353%
Tract 125.10080130125105.0 mi southBoulder County3,806±351$145,625$934,900$2,74644%
Tract 127.01080130127014.1 mi northBoulder County5,947±564$139,597$1,097,500$2,39636%
Tract 137.04080130137045.9 mi northwestBoulder County4,992±522$86,163$1,041,900$1,71929%
Tract 127.08080130127084.4 mi northeastBoulder County4,402±333$128,842$926,800$2,29628%
Tract 127.07080130127073.6 mi eastBoulder County2,409±421$81,620$829,900$1,58323%
Tract 127.10080130127104.0 mi southeastBoulder County3,214±311$165,781$1,339,100$2,15418%
Tract 127.09080130127095.5 mi northeastBoulder County2,113±365$151,250$834,900$2,6254%
Tract 132.05080130132057.5 mi northeastBoulder County4,736±496$155,234$927,100$1,4143%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files · Census block assignment files

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections