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Census tracts · Boulder County

Census tracts in Boulder County, Colorado

Boulder County is divided into 78 census tracts. Among the tracts with a reliable estimate, median household income runs from $23,590 in Tract 126.10 to $244,179 in Tract 121.01 (ACS 2020-2024 5-year estimates).

Every census tract in Boulder County

Sort by any column. A tract's number repeats across counties; the GEOID under each name is unique. A ring marks an estimate whose coefficient of variation is over 40%.

Census tracts of Boulder County, ACS 2020-2024 5-year estimates
Tract 121.0108013012101Boulder (93%)4,7934,800±609$244,179$2,000,000 or more$2,1469.4%
Tract 121.0308013012103Boulder (65%)3,8103,318±386$118,750$1,188,100$2,1586.8%
Tract 121.0408013012104Boulder (84%)2,6662,307±222$155,313$1,268,900not published3.5%
Tract 121.0508013012105Boulder (94%)6,6356,180±773$102,112$886,600$2,22413.4%
Tract 121.0608013012106Boulder2,8002,628±319$132,227$1,199,700$2,4217.8%
Tract 121.0708013012107Boulder4,2004,377±626$99,948$1,057,800$2,21919.9%
Tract 122.0108013012201Boulder (88%)3,4823,402±534$123,250$2,000,000 or more$2,18719.4%
Tract 122.0408013012204Boulder3,4623,346±622$51,583$1,597,600$1,95935.8%
Tract 122.0508013012205Boulder2,9383,306±631$52,262$973,400$1,81321.3%
Tract 122.0608013012206Boulder3,3193,095±433$34,183$576,900$1,79744.7%
Tract 122.0708013012207Boulder (93%)5,4674,899±573$77,965$410,200$1,91113.8%
Tract 122.0808013012208Boulder (99%)2,5012,350±278$95,671$691,800$2,38417.7%
Tract 12308013012300Boulder7,0597,025±247$33,750not published$1,54830.9%
Tract 124.0108013012401Boulder5,8787,424±1,035$38,961$1,602,200$3,05366.7%
Tract 125.0108013012501Boulder (71%)2,4722,653±569$110,500$840,600$1,9765.2%
Tract 125.0508013012505Boulder (97%)4,2514,100±437$184,353$1,675,500$2,46111.8%
Tract 125.0708013012507Boulder4,4044,043±522$53,971$900,700$2,15025.9%
Tract 125.0808013012508Boulder (82%)2,9522,637±262$97,019$828,900$2,08513.8%
Tract 125.0908013012509Boulder3,3223,361±468$184,116$1,146,300$3,500 or more4.5%
Tract 125.1008013012510Boulder (44%)4,3183,806±351$145,625$934,900$2,7467.4%
Tract 125.1108013012511Boulder6,8056,066±349$79,385$906,000$1,95914.5%
Tract 126.0308013012603Boulder (95%)3,3993,450±424$136,576$1,089,300$2,6418.6%
Tract 126.0508013012605Boulder1,6811,933±466$40,038$654,600$2,01449.3%
Tract 126.0808013012608Boulder2,2472,279±303$113,125$776,300$2,16411.5%
Tract 126.0908013012609Boulder1,4041,362±294$30,119$577,900$1,82646.3%
Tract 126.1008013012610Boulder5,0425,294±624$23,590$372,100$1,77557.2%
Tract 127.0108013012701Boulder (36%)6,4495,947±564$139,597$1,097,500$2,3966.6%
Tract 127.0508013012705Boulder (53%)4,5085,200±827$91,429$543,700$1,96311.2%
Tract 127.0708013012707Boulder (23%)2,0702,409±421$81,620$829,900$1,5836.6%
Tract 127.0808013012708Gunbarrel (65%)5,1014,402±333$128,842$926,800$2,2963.5%
Tract 127.0908013012709Gunbarrel (92%)1,8232,113±365$151,250$834,900$2,62514.6%
Tract 127.1008013012710Louisville (22%)3,7523,214±311$165,781$1,339,100$2,1545.2%
Tract 128.0108013012801Erie (80%)8,7189,476±573$167,724$806,000$3,3574.2%
Tract 128.0208013012802Erie (49%)6,4327,068±1,019$180,234$781,800$2,9730.9%
Tract 129.0308013012903Lafayette (84%)2,3042,331±314$168,500$977,400$3,500 or more0.9%
Tract 129.0408013012904Lafayette (73%)5,8646,144±672$153,833$690,000$2,8016.1%
Tract 129.0508013012905Lafayette2,6322,828±410$79,881$645,600$1,9417.4%
Tract 129.0708013012907Lafayette (78%)3,5943,357±325$127,308$644,800$2,1143.5%
Tract 130.0308013013003Louisville (41%)7,7247,530±604$144,494$868,400$2,0006.2%
Tract 130.0408013013004Louisville (98%)3,4633,428±494$201,146$890,900$2,7590.6%
Tract 130.0508013013005Louisville (98%)3,5383,087±352$114,773$904,000$1,9403.7%
Tract 130.0608013013006Louisville (99%)5,5155,785±682$180,819$912,000$2,0696.2%
Tract 132.0108013013201Longmont (5%)2,4282,076±259$102,961$970,200$1,78811.4%
Tract 132.0208013013202–1,3791,594±292$142,167$1,235,100$1,6894.5%
Tract 132.0508013013205Niwot (60%)5,3314,736±496$155,234$927,100$1,4142.4%
Tract 132.0708013013207Longmont (88%)4,5653,919±380$90,317$664,400$1,82610.0%
Tract 132.0808013013208Longmont (97%)5,8326,151±525$93,705$626,500$1,8696.2%
Tract 132.1008013013210Longmont (96%)5,6055,946±809$84,728$451,900$1,7008.8%
Tract 132.1108013013211Longmont (70%)7,0427,101±846$117,299$711,600$2,04814.4%
Tract 132.1208013013212Longmont (71%)4,6154,903±480$102,132$631,200$1,9935.9%
Tract 132.1408013013214Longmont (67%)5,5086,242±1,030$139,400$863,300$2,2073.5%
Tract 132.1508013013215Longmont (83%)5,7885,192±545$71,170$779,200$1,71110.4%
Tract 133.0208013013302Longmont (93%)5,1665,094±615$65,068$654,700$1,67819.3%
Tract 133.0508013013305Longmont (96%)5,0455,632±851$102,262$498,100$1,8786.0%
Tract 133.0608013013306Longmont4,5804,335±798$92,041$478,900$1,5754.4%
Tract 133.0708013013307Longmont3,8033,625±469$80,250$517,500$1,5648.7%
Tract 133.0808013013308Longmont3,5353,682±434$74,323$487,600$1,8546.0%
Tract 134.0108013013401Longmont (95%)3,7913,893±387$66,079$433,200$1,70515.0%
Tract 134.0208013013402Longmont (91%)8,0467,796±801$105,520$509,700$2,0034.8%
Tract 135.0308013013503Longmont5,4325,110±612$66,645$439,400$1,58115.2%
Tract 135.0508013013505Longmont3,9504,572±1,002$63,438$435,900$1,4488.6%
Tract 135.0608013013506Longmont (98%)4,8854,696±395$98,719$608,200$2,0041.2%
Tract 135.0708013013507Longmont3,6843,401±460$91,750$469,500$1,97114.7%
Tract 135.0808013013508Longmont (96%)7,9767,801±669$118,670$622,300$2,1802.9%
Tract 136.0108013013601Lyons (34%)3,9253,597±480$123,410$856,600$1,9079.5%
Tract 136.0208013013602Allenspark (57%)9681,264±320$109,653$676,200$1,3215.9%
Tract 137.0308013013703Jamestown (15%)1,2131,291±218$87,209$585,300$1,7118.4%
Tract 137.0408013013704Boulder (29%)5,2224,992±522$86,163$1,041,900$1,7197.9%
Tract 137.0508013013705Nederland (48%)1,9232,383±447$83,454$700,700$1,48512.2%
Tract 137.0608013013706Coal Creek (17%)3,8633,686±391$137,891$796,200$3,1023.3%
Tract 606.0108013060601Superior (89%)4,5715,541±688$123,942$849,700$2,3033.2%
Tract 606.0208013060602Superior (49%)1,320562±185$104,464$614,600$2,9048.5%
Tract 60708013060700Louisville (71%)3,0552,664±324$153,726$923,600$2,4123.2%
Tract 608.0108013060801Lafayette (67%)3,9053,906±484$75,728$586,400$1,9738.2%
Tract 608.0208013060802Lafayette (93%)5,1005,267±808$65,968$290,800$2,01910.2%
Tract 60908013060900Lafayette (75%)5,4415,224±752$128,824$733,500$2,2273.3%
Tract 61308013061300Superior3,3413,207±353$242,614$961,200$3,4290.7%
Tract 61408013061400Superior4,1314,120±574$201,288$924,300$3,1584.7%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); place = the place holding most of the tract's 2020 census blocks · Check it at data.census.gov

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