There are 53 cities in Boulder County, Colorado.

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City
Rank
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
Boulder1108,453108,1121.39%4,12526.29
Longmont296,61999,181-1.06%3,36228.74
Erie336,21230,4054.48%1,83819.71
Lafayette430,66330,422-0.06%3,2549.42
Louisville520,00221,173-1.38%2,5077.98
Superior613,68013,1051.44%3,4663.95
Pleasanton711,36010,6811.59%1,2748.92
Gunbarrel810,10810,494 1,6086.29
Jourdanton94,4984,1012.72%1,2883.49
Niwot104,0914,085 1,0244
Lytle113,1982,9202.34%6724.76
Poteet123,0762,8012.13%1,7751.73
Coal Creek132,4312,605 2599.39
Lyons142,0762,209-1.66%1,5421.35
Charlotte151,6251,5321.56%7972.04
Bruce161,5761,701-1.75%6472.44
Nederland171,5001,465 1,0141.48
Calhoun City181,4171,528-1.67%6012.36
Cordry Sweetwater Lakes191,3281,323 4982.67
Nashville201,2521,254-0.24%7821.60
Leming211,168599 2424.83
Vardaman221,0411,111-1.42%7671.36
Lazy Acres231,0141,071 1925.29
Derma24897954-1.32%5061.77
Paragon Estates25857785 5121.68
Allenspark26622464 5211.93
Altona27531479 3151.69
Pine Brook Hill28521776 1822.86
Sugarloaf29501262 2302.18
St. Ann Highlands30452486 3251.39
Tall Timber31410295 7140.57
Eldora32381352 924.16
Coal Creek333703590.54%3101.19
Powers Lake34366387-1.35%2741.34
Christine353573371.42%2081.72
Eldorado Springs36284325 1102.58
Bowbells37280293-1.06%3360.83
Crisman3826451 1811.46
Gold Hill39249195 1202.08
Jamestown40244254-0.81%3920.62
Sunshine41212145 1231.73
Mountain Meadows42179174 1041.72
Pittsboro43153162-1.29%1560.98
Bonanza Mountain Estates44133174 7920.17
Seven Hills45133127 2720.49
Lignite46133140-1.48%8530.16
Bark Ranch47129107 1500.86
Columbus48128136-1.54%4690.27
Ward49126130-0.79%2200.57
Big Creek50123132-1.6%1081.14
Portal51118123-0.84%1760.67
Slate Springs52100103 711.42
Flaxton535963-1.67%2080.28
showing: 53 rows

Cities in Boulder County, Colorado by Population (2024)

What is the largest city in Boulder County, Colorado?

Boulder is the largest city in Boulder County.

What is the smallest city in Boulder County, Colorado?

Flaxton is the smallest city in Boulder County.

How many cities are in Boulder County?

There are 53 cities in Boulder County, Colorado.

Frequently Asked Questions