B
- Badito
- Bailey
- Balarat
- Baldwin
- Balfour
- Balltown
- Balzac
- Barela
- Bark Ranch
- Barnesville
- Barr Lake
- Bartlett
- Basalt
- Basin
- Battle Creek
- Battlement Mesa
- Baxter
- Bayfield
- Beacon Hill
- Beards Corner
- Beaver Point
- Beck Sand Draw Crossing
- Bedrock
- Beecher Island
- Bell
- Belleview
- Bellvue
- Bennett
- Benton
- Bergen Park
- Berkley
- Berthoud
- Berthoud Falls
- Beshoar
- Beta
- Beta
- Bethune
- Beulah
- Beulah Valley
- Beverly Hills
- Big Bend
- Big Elk Meadows
- Bighorn
- Biglow
- Bijou
- Birdseye
- Black Eagle Mill
- Black Forest
- Black Hawk
- Black Mountain Ranch
- Blakeland
- Blanca
- Blanco
- Blende
- Bloom
- Blue Mountain
- Blue Mountain Estates
- Blue River
- Blue Valley
- Bocea
- Bockman Lumber Camp
- Boggsville
- Bonanza
- Boncarbo
- Bond
- Bondad
- Bonita
- Boone
- Bordenville
- Boulder
- Bountiful
- Bovina
- Bowie
- Bow Mar
- Box Prairie
- Boyero
- Bracewell
- Bradford
- Bragdon
- Brandon
- Branson
- Breckenridge
- Breed
- Breen
- Brewster
- Bridgeport
- Bridges Switch
- Briggsdale
- Brighton
- Brimstone Corner
- Bristol
- Broadmoor
- Bronquist
- Brook Forest
- Brook Forest Estates
- Brookside
- Brookvale
- Broomfield
- Brownlee
- Browns Canon
- Browns Corner
- Brumley
- Brush
- Bryn Mawr
- Buchanan
- Buckeye
- Buckingham
- Buckskin Joe
- Buda
- Buena Vista
- Buffalo Creek
- Buford
- Buick
- Bulger
- Bunyan
- Burdett
- Burlington
- Burns
- Burnt Mill
- Buttermilk
- Buttes
- Buxton
- Byers